NBT BANCORP INC

December 31, 2025 and 2024

1. Summary of Significant Accounting Policies

The accounting and reporting policies of NBT Bancorp Inc. and its subsidiaries, NBT Bank, National Association (“NBT Bank” or the “Bank”), NBT Financial Services, Inc. and NBT Holdings, Inc., conform, in all material respects, with U.S. generally accepted accounting principles (“GAAP”) and to general practices within the banking industry. Collectively, NBT Bancorp Inc. and its subsidiaries are referred to herein as (the “Company”).

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts in the financial statements and accompanying notes. Actual results may differ from those estimates and such differences could be material to the financial statements.

Estimates associated with the allowance for credit losses are particularly susceptible to material change in the near term.

The following is a description of significant policies and practices:

Consolidation

The accompanying consolidated financial statements include the accounts of NBT Bancorp Inc. and its wholly-owned subsidiaries mentioned above. All material intercompany transactions have been eliminated in consolidation. Amounts previously reported in the consolidated financial statements are reclassified whenever necessary to conform to the current year’s presentation. In the “Parent Company Financial Information,” the investment in subsidiaries is recorded using the equity method of accounting.

The Company determines whether it has a controlling financial interest in an entity by first evaluating whether the entity is a voting interest entity or a variable interest entity under GAAP. Voting interest entities are entities in which the total equity investment at risk is sufficient to enable the entity to finance itself independently and provides the equity holders with the obligation to absorb losses, the right to receive residual returns and the right to make decisions about the entity’s activities. The Company consolidates voting interest entities in which it has all, or at least a majority of, the voting interest. As defined in applicable accounting standards, variable interest entities (“VIEs”) are entities that lack one or more of the characteristics of a voting interest entity. A controlling financial interest in a VIE is present when the Company has both the power and ability to direct the activities of the VIE that most significantly impact the VIE’s economic performance and an obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. The Company’s wholly-owned subsidiaries CNBF Capital Trust I, NBT Statutory Trust I, NBT Statutory Trust II, Alliance Financial Capital Trust I, Alliance Financial Capital Trust II and Evans Capital Trust I are VIEs for which the Company is not the primary beneficiary. Accordingly, the accounts of these entities are not included in the Company’s consolidated financial statements.

Segment Reporting

The Company’s operations are primarily in the community banking industry and include the provision of traditional banking services. The Company also provides other services through its subsidiaries such as insurance, retirement plan administration and wealth management. The Company operates in the geographical regions of upstate New York, northeastern Pennsylvania, southern New Hampshire, western Massachusetts, Vermont, southern Maine and central and northwestern Connecticut.

The Company manages its operations under the segments of Banking, including Wealth Management, Retirement Plan Administration and Insurance. Prior to the fourth quarter of 2024, the Company disclosed asingle reportable segment, as revenue from individual segments were below the disclosure threshold relative to consolidated revenue, total assets and operating profit or loss. Each year the Company evaluates its business activities, financial results and operational data to determine whether segment disclosure is required.

In accordance with Accounting Standards Update (“ASU”) 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, management assesses its operating segment structure to enhance transparency in how financial performance is evaluated and resources are allocated by the chief operating decision maker (“CODM”). The Company has determined that it operates throughtwo reportable segments: Banking and Retirement Plan Administration, as they meet both the quantitative threshold and qualitative criteria for disclosure. Wealth Management is combined with our Banking segment in accordance with the similarity test outlined in ASC 280. Insurance does not meet materiality requirements for disclosure and is included in the “All Other” category.

Cash Equivalents

The Company considers amounts due from correspondent banks, cash items in process of collection and institutional money market mutual funds to be cash equivalents for purposes of the consolidated statements of cash flows.

Securities

The Company classifies its securities at date of purchase as either held to maturity (“HTM”), available for sale (“AFS”) or equity. HTM debt securities are those that the Company has the ability and intent to hold until maturity. AFS debt securities are securities that are not classified as HTM. AFS securities are recorded at fair value. Unrealized holding gains and losses, net of the related tax effect, on AFS securities are excluded from earnings and are reported in the consolidated statements of changes in stockholders’ equity and the consolidated statements of comprehensive income (loss) as a component of accumulated other comprehensive income (loss) (“AOCI”). HTM securities are recorded at amortized cost. Transfers of securities between categories are recorded at fair value at the date of transfer. Non-marketable equity securities and equity securities without readily determinable fair values are carried at cost. The Company performs a qualitative assessment on equity securities to determine whether the investments are impaired and downward or upward adjustments are recognized through the income statement. All other equity securities are recorded at fair value, with net unrealized gains and losses recognized in income.

Premiums and discounts are amortized or accreted over the life of the related security as an adjustment to yield using the interest method. Dividend and interest income are recognized when earned. Realized gains and losses on securities sold are derived using the specific identification method for determining the cost of securities sold.

Investments in Federal Reserve Board (“FRB”) and Federal Home Loan Bank (“FHLB”) stock are required for membership in those organizations and are carried at cost since there is no market value available. The FHLB New York continues to pay dividends and repurchase stock. As such, the Company has not recognized any impairment on its holdings of FRB and FHLB stock.

Allowance for Credit Losses – HTM Debt Securities

With respect to its HTM debt securities, the Company is required to utilize the Financial Accounting Standards Board (“FASB”) ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments methodology to estimate expected credit losses. Management measures expected credit losses on HTM debt securities on a collective basis by major security types that share similar risk characteristics, such as (as applicable): internal or external (third-party) credit score or credit ratings, risk ratings or classification, financial asset type, collateral type, size, effective interest rate, term, geographical location, industry of the borrower, vintage, historical or expected credit loss patterns, and reasonable and supportable forecast periods. Management classifies the HTM portfolio into the following major security types: U.S. government agency or U.S. government-sponsored mortgage-backed and collateralized mortgage obligations securities, and state and municipal debt securities.

The HTM mortgage-backed and collateralized mortgage obligations securities are issued by U.S. government agencies or U.S. government-sponsored enterprises. These securities are either explicitly and/or implicitly guaranteed by the U.S. government as to timely repayment of principal and interest, are highly rated by major rating agencies, and have a long history of zero credit losses. Therefore, the Company did not record an allowance for credit loss for these securities.

State and municipal bonds generally carry a Moody’s rating of A to AAA. In addition, the Company has a limited amount of New York state local municipal bonds that are not rated. The estimate of expected credit losses on the HTM portfolio is based on the expected cash flows of each individual bond over its contractual life and considers historical credit loss information, current conditions and reasonable and supportable forecasts. Given the rarity of municipal defaults and losses, the Company utilized Moody’s Municipal Loss Forecast Model as the sole source of municipal default and loss rates which provides decades of data across all municipal sectors and geographies. As with the loan portfolio, cash flows are forecast over a 6-quarter period under various weighted economic conditions, with a reversion to long-term average economic conditions over a 4-quarter period on a straight-line basis. Management may exercise discretion to make adjustments based on environmental factors. The Company determined that the expected credit loss on its HTM municipal bond portfolio was deemed immaterial, thereforeno allowance for credit losses was recorded.

Allowance for Credit Losses – AFS Debt Securities

The impairment model for AFS debt securities differs from the current expected credit losses (“CECL”) methodology utilized for HTM debt securities because AFS debt securities are measured at fair value rather than amortized cost. For AFS debt securities in an unrealized loss position, the Company first assesses whether it intends to sell, or it is more likely than not that it will be required to sell the security before recovery of their amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the security’s amortized cost basis is written down to fair value through income. For AFS debt securities that do not meet the aforementioned criteria, in making this assessment, management considers the extent to which fair value is less than amortized cost, any changes to the rating of the security by a rating agency, adverse conditions specifically related to the security, failure of the issuer of the debt security to make scheduled interest or principal payments, among other factors. If this assessment indicates that a credit loss exists, the present value of cash flows expected to be collected from the security are compared to the amortized cost basis of the security. The cash flows should be estimated using information relevant to the collectability of the security, including information about past events, current conditions and reasonable and supportable forecasts. If the present value of cash flows expected to be collected is less than the amortized cost basis, a credit loss exists and an allowance for credit losses is recorded for the credit loss, limited by the amount that the fair value is less than the amortized cost basis. Any impairment that has not been recorded through an allowance for credit losses is recognized in other comprehensive income.

Loan Held for Sale and Loan Servicing

Loans held for sale are recorded at the lower of cost or fair value on an individual basis. Loan sales are recorded when the sales are funded. Gains and losses on sales of loans held for sale are included in other noninterest income in the consolidated statements of income. Mortgage loans held for sale are generally sold with servicing rights retained. Mortgage servicing rights are recorded at fair value upon sale of the loan, and are amortized in proportion to and over the period of estimated net servicing income.

Loans

Loans are recorded at their current unpaid principal balance, net of unearned income and unamortized loan fees and expenses, which are amortized under the effective interest method over the estimated lives of the loans. Interest income on loans is accrued based on the principal amount outstanding.

For all loan classes within the Company’s loan portfolio, loans are placed on nonaccrual status when timely collection of principal and/or interest in accordance with contractual terms is in doubt. Loans are transferred to nonaccrual status generally when principal or interest payments become over ninety days delinquent, unless the loan is well secured and in the process of collection, or sooner when management concludes circumstances indicate that borrowers may be unable to meet contractual principal or interest payments. When a loan is transferred to a nonaccrual status, all interest previously accrued in the current period but not collected is reversed against interest income in that period. Interest accrued in a prior period and not collected is charged-off against the allowance for credit losses.

If ultimate repayment of a nonaccrual loan is expected, any payments received are applied in accordance with contractual terms. If ultimate repayment of principal is not expected, any payment received on a nonaccrual loan is applied to principal until ultimate repayment becomes expected. For all loan classes within the Company’s loan portfolio, nonaccrual loans are returned to accrual status when they become current as to principal and interest and demonstrate a period of performance under the contractual terms and, in the opinion of management, are fully collectible as to principal and interest. For loans in all portfolios, the principal amount is charged off in full or in part as soon as management determines, based on available facts, that the collection of principal in full or in part is improbable. For Commercial loans, management considers specific facts and circumstances relative to individual credits in making such a determination. For Consumer and Residential loan classes, management uses specific guidance and thresholds from the Federal Financial Institutions Examination Council’s Uniform Retail Credit Classification and Account Management Policy.

Beginning in 2023, with the Company’s adoption of ASU 2022-02, Financial Instruments -CECL Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures(“ASU 2022-02”), the recognition of a troubled debt restructuring (“TDR”) was eliminated and instead the Company evaluates borrowers who are experiencing financial difficulty or loan modifications to borrowers experiencing financial difficulties. When a borrower is experiencing financial difficulties and the Company modifies a loan, such modifications generally include one or a combination of the following: an extension of the maturity date at a stated rate of interest lower than the current market rate for new debt with similar risk; a change in scheduled payment amount; or principal forgiveness. Modifications to borrowers experiencing financial difficulty may be different from those previously disclosed in TDR disclosures since the Company is no longer required to determine if a concession has been granted, which was a requirement to determine whether a loan modification was considered to be a TDR. Historically, a TDR would generally include one or a combination of the following: an extension of the maturity date at a stated rate of interest lower than the current market rate for new debt with similar risk; a temporary reduction in the interest rate; or a change in scheduled payment amount. TDR loans were nonaccrual loans; however, they could be returned to accrual status after a period of performance, generally evidenced bysix months of compliance with their modified terms.

Allowance for Credit Losses - Loans

The CECL methodology requires an estimate of the credit losses expected over the life of a loan (or pool of loans). The allowance for credit losses is a valuation account that is deducted from, or added to, the loans’ amortized cost basis to present the net, lifetime amount expected to be collected on the loans. Loan losses are charged off against the allowance when management believes a loan balance is confirmed to be uncollectible. Expected recoveries do not exceed the aggregate of amounts previously charged-off and expected to be charged-off.

Management estimates the allowance balance for credit losses using relevant information, from internal and external sources, related to past events, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amounts. Historical loss experience is generally the starting point for estimating expected credit losses. The Company then considers whether the historical loss experience should be adjusted for asset-specific risk characteristics or current conditions at the reporting date that did not exist over the period from which historical experience is used. Adjustments to historical loss information is made for differences in current loan-specific risk characteristics such as differences in underwriting standards, portfolio mix, delinquency level or term as well as changes in environmental conditions, such as changes in unemployment rates, production metrics, property values, or other relevant factors. Company historical loss experience is supplemented with peer information when there is insufficient loss data for the Company. Peer selection is based on a review of institutions with comparable loss experience as well as loan yield, bank size, portfolio concentration and geography. Finally, the Company considers forecasts about future economic conditions that are reasonable and supportable. Significant management judgment is required at various points in the measurement process.

Portfolio segment is defined as the level at which an entity develops and documents a systematic methodology to determine its allowance for credit losses. Upon adoption of CECL, management revised the manner in which loans were pooled for similar risk characteristics. Management developed segments for estimating loss based on type of borrower and collateral which is generally based upon federal call report segmentation and have been combined or subsegmented as needed to ensure loans of similar risk profiles are appropriately pooled.

The following table illustrates the portfolio and class segments for the Company’s loan portfolio:

Commercial Loans

The Company offers a variety of commercial loan products. The Company’s underwriting analysis for commercial loans typically includes credit verification, independent appraisals, a review of the borrower’s financial condition and a detailed analysis of the borrower’s underlying cash flows.

Commercial and Industrial (“C&I”) – The Company offers a variety of loan options to meet the specific needs of our C&I customers including term loans, time notes and lines of credit. Such loans are made available to businesses for working capital needs and are typically collateralized by business assets such as equipment, accounts receivable and perishable agricultural products, which are exposed to industry price volatility. To reduce these risks, management also attempts to obtain personal guarantees of the owners or to obtain government loan guarantees to provide further support.

Commercial Real Estate (“CRE”) – The Company offers CRE loans to finance real estate purchases, refinancing’s, expansions and improvements to commercial and agricultural properties. CRE loans are loans that are secured by liens on real estate, which may include both owner-occupied and nonowner-occupied properties, such as apartments, commercial structures, health care facilities and other facilities. The Company’s underwriting analysis includes credit verification, independent appraisals, a review of the borrower’s financial condition and a detailed analysis of the borrower’s underlying cash flows. These loans are typically originated in amounts of no more than 80% of the appraised value of the property. Government loan guarantees may be obtained to provide further support for agricultural property.

Consumer Loans

The Company offers a variety of Consumer loan products including Auto, Residential Solar and Other Consumer loans.

Auto– The Company provides both direct and indirect financing of automobiles (“Auto”). The Company maintains relationships with a wide network of dealers throughout the areas we serve across the northeastern United States. Through these relationships, the Company primarily finances the purchases of automobiles indirectly through dealer relationships. Auto loans are secured with collateral consisting of a perfected lien on the vehicle being purchased. Most of these loans carry a fixed rate of interest with principal repayment terms typically ranging from three toseven years, based upon the nature of the collateral and the size of the loan.

Residential Solar – The Company previously offered loans across a national footprint originated through our relationships with national technology-driven consumer lending companies to finance the purchase and installation of residential solar energy. Advances of credit through this business line are subject to the Company’s underwriting standards including criteria such as FICO score and debt to income thresholds. In 2017, the Company partnered with Sungage Financial, LLC. to offer financing to consumers for solar ownership with the program tailored for delivery through solar installers. Advances of credit through this business line are to prime borrowers and are subject to the Company’s underwriting standards. Residential solar loans carry a fixed rate of interest with principal repayment terms typically ranging from five totwenty-five years. Typically, the Company collects origination fees that are deferred and recognized into interest income over the estimated life of the loan.

Other Consumer – The Other Consumer loan segment consists primarily of unsecured consumer loans and direct consumer loans. The Company offers a variety of direct consumer installment loans to finance various personal expenditures. In addition to installment loans, the Company also offers personal lines of credit, overdraft protection, debt consolidation, education and other uses. Direct consumer installment loans carry a fixed rate of interest with principal repayment terms typically ranging fromone tofifteen years, based upon the nature of the collateral and the size of the loan. Consumer installment loans are often secured with collateral consisting of a perfected lien on the asset being purchased or a perfected lien on a consumer’s deposit account. Risk is reduced through underwriting criteria, which include credit verification, appraisals, a review of the borrower’s financial condition and personal cash flows. A security interest, with title insurance when necessary, is taken in the underlying real estate. The Company previously offered unsecured consumer loans across a national footprint originated through our relationships with national technology-driven consumer lending companies to finance such things as dental and medical procedures, K-12 tuition and other consumer purpose loans. Advances of credit through this business line were subject to the Company’s underwriting standards including criteria such as FICO score and debt to income thresholds. Advances of credit through this business line were to prime borrowers and are subject to the Company’s underwriting standards. Typically, the Company collects origination fees that are deferred and recognized into interest income over the estimated life of the loan.

Residential

Residential loans consist primarily of loans secured by a first or second mortgage on primary residences, home equity loans and lines of credit in first and second lien positions and residential construction loans. We originate adjustable-rate and fixed rate, one-to-four-family residential loans for the construction or purchase of a residential property or the refinancing of a mortgage. These loans are collateralized by properties located in the Company’s market area. Loans on one-to-four-family residential are generally originated in amounts of no more than 85% of the purchase price or appraised value (whichever is lower) or have private mortgage insurance. Mortgage title insurance and hazard insurance are normally required. Construction loans have a unique risk because they are secured by an incomplete dwelling. This risk is reduced through periodic site inspections, including one at each loan draw period. For home equity loans, consumers are able to borrow up to 85% of the equity in their homes and are generally tied to Prime with aten-year draw followed by afifteen-year amortization. These loans carry a higher risk than first mortgage residential loans as they are often in a second position with respect to collateral.

Historical credit loss experience over the observation period for both the Company and segment-specific peers provides the basis for the estimation of expected credit losses, where observed credit losses are converted using models to probability of default (“PD”) rate curves through the use of segment-specific loss given default (“LGD”) risk factors that convert default rates to loss severity based on industry-level, observed relationships between the two variables for each asset class, primarily due to the nature of the underlying collateral. These risk factors were assessed for reasonableness against the Company’s own loss experience and adjusted in certain cases when the relationship between the Company’s historical default and loss severity deviated from that of the wider industry. The historical PD curves, together with corresponding economic conditions, establish a quantitative relationship between economic conditions and loan performance through an economic cycle.

Using the historical relationship between economic conditions and loan performance, management’s expectation of future loan performance is incorporated using externally developed economic forecasts which are probabilistically weighted to reflect potential forecast inaccuracy and model limitations. These forecasts are applied over a period that management has determined to be reasonable and supportable. Beyond the period over which management can develop or source a reasonable and supportable forecast, the model will revert to long-term average economic conditions using a straight-line, time-based methodology.

The allowance for credit losses is measured on a collective (pool) basis, with both a quantitative and qualitative analysis that is applied on a quarterly basis, when similar risk characteristics exist. The respective quantitative allowance for each segment is measured using an econometric, PD/LGD modeling methodology in which distinct, segment-specific multi-variate regression models are applied to multiple, probabilistically weighted external economic forecasts of economic variables. Under the discounted cash flows methodology, expected credit losses are estimated over the effective life of the loans by measuring the difference between the net present value of modeled cash flows and amortized cost basis. Contractual cash flows over the contractual life of the loans are the basis for modeled cash flows, adjusted for modeled defaults, expected prepayments and curtailments and discounted at the loan-level stated interest rate. The contractual term excludes expected extensions, renewals, and modifications unless the extension or renewal options are included in the original or modified contract at the reporting date and are not unconditionally cancellable by the Company.

After quantitative considerations, management applies additional qualitative adjustments so that the allowance for credit losses is reflective of the estimate of lifetime losses that exist in the loan portfolio at the balance sheet date. Qualitative considerations include limitations inherent in the quantitative model; trends experienced in nonperforming and delinquent loans; changes in value of underlying collateral; changes in lending policies and procedures; nature and composition of loans; portfolio concentrations that may affect loss experience across one or more components of the portfolio; the experience, ability and depth of lending management and staff; the Company’s credit review system; and the effect of external factors; such as competition, legal and regulatory requirements.

The threshold for evaluating commercial loans risk graded substandard or doubtful, and nonperforming loans specifically evaluated for individual credit loss is $1.0 million. When management determines that foreclosure is probable, expected credit losses are based on the fair value of the collateral at the reporting date, adjusted for selling costs as appropriate. If the loan is not collateral dependent, the allowance for credit losses related to individually assessed loans is based on discounted expected cash flows using the loan’s initial effective interest rate. Generally, individually assessed loans are collateral dependent.

The Company estimates expected credit losses over the contractual period in which the Company has exposure to credit risk via a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the Company. The allowance for credit losses on off-balance sheet credit exposures is adjusted as an expense in other noninterest expense. The estimate includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over their estimated lives. Estimating credit losses on unfunded commitments requires the Bank to consider the following categories of off-balance sheet credit exposure: unfunded commitments to extend credit, unfunded lines of credit and standby letters of credit. Each of these unfunded commitments is then analyzed for a probability of funding to calculate a probable funding amount. The life of loan loss factor by related portfolio segment from the loan allowance for credit loss calculation is then applied to the probable funding amount to calculate a reserve on unfunded commitments.

Accrued Interest Receivable

Accrued interest receivable (“AIR”) balances are included in other assets on the consolidated balance sheets. The Company has excluded interest receivable that is included in amortized cost of financing receivables from related disclosure requirements and AIR is written off by reversing interest income. For loans, write off typically occurs upon becoming over 90 to 120 days past due and therefore the amount of such write offs are immaterial. Historically, the Company has not experienced uncollectible AIR on investment securities.

Premises and Equipment

Premises and equipment are stated at cost, less accumulated depreciation. Depreciation of premises and equipment is determined using the straight-line method over the estimated useful lives of the respective assets. Expenditures for maintenance, repairs and minor replacements are charged to expense as incurred.

Leases

The Company determines if a lease is present at the inception of an agreement. Right-of-use (“ROU”) assets and lease liabilities are recognized at lease commencement based on the present value of the remaining lease payments using a discount rate that represents the Company’s incremental borrowing rate at the lease commencement date. ROU assets and operating lease liabilities, are included in other assets and other liabilities, respectively, on theconsolidated balance sheets. Leases with original terms of 12 months or less are recognized in profit or loss on a straight-line basis over the lease term.

Operating lease ROU assets represent the Company’s right to use an underlying asset during the lease term and operating lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets are further adjusted for lease incentives. Operating lease expense, which is comprised of amortization of the ROU asset and the implicit interest accreted on the operating lease liability, is recognized on a straight-line basis over the lease term, and is recorded in occupancy expense in theconsolidated statements of income.

The Company has lease agreements with lease and non-lease components, which are generally accounted for separately. For real estate leases, non-lease components and other non-components, such as common area maintenance charges, real estate taxes and insurance are not included in the measurement of the lease liability since they are generally able to be segregated. Our leases relate primarily to office space and bank branches, and some contain options to renew the lease. These options to renew are generally not considered reasonably certain to exercise, and are therefore not included in the lease term until such time that the option to renew is reasonably certain.

Other Real Estate Owned

Other real estate owned (“OREO”) consists of properties acquired through foreclosure or by acceptance of a deed in lieu of foreclosure. These assets are recorded at the lower of fair value of the asset acquired less estimated costs to sell or “cost” (defined as the fair value at initial foreclosure). At the time of foreclosure, or when foreclosure occurs in-substance, any excess loan balance over fair market value of the acquired asset, less estimated selling costs, is charged to the allowance for loan losses. Any subsequent valuation write-downs are recorded as other expense. In connection with the determination of the allowance for loan losses and the valuation of OREO, management obtains appraisals for properties. Operating costs associated with the properties are expensed as incurred. Gains on the sale of OREO are recognized as income when title has passed and the sale has met the minimum down payment requirements prescribed by GAAP. The balance of OREO is recorded in other assets on the consolidated balance sheets.

Goodwill and Other Intangible Assets

Goodwill represents the cost of acquired business in excess of the fair value of the related net assets acquired. Goodwill is not amortized but tested at the reporting unit level for impairment on an annual basis and on an interim basis or when events or circumstances dictate. The Company has elected June 30 as the annual impairment testing date for the insurance and retirement services reporting units and December 31 for the Bank reporting unit.

The Company has the option to first assess qualitative factors, by performing a qualitative analysis, to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the events or circumstances, the Company determines it is more likely than not that the fair value of a reporting unit is greater than its carrying amount, the impairment test is not required. If the Company concludes otherwise, the Company is required to perform a quantitative impairment test. In the quantitative impairment test, the estimated fair value of a reporting unit is compared to the carrying amount in order to determine if impairment is indicated. If the estimated fair value exceeds the carrying amount, the reporting unit is not deemed to be impaired. If the estimated fair value is below the carrying value of the reporting unit, the difference is the amount of impairment.

Intangible assets that have indefinite useful lives are not amortized, but are tested at least annually for impairment. Intangible assets that have finite useful lives are amortized over their useful lives. Core deposit intangibles and trust intangibles at the Company are amortized using the sum-of-the-years’-digits method. Covenants not to compete are amortized on a straight-line basis. Customer lists are amortized using an accelerated method. When facts and circumstances indicate potential impairment of amortizable intangible assets, the Company evaluates the recoverability of the asset carrying value, using estimates of undiscounted future cash flows over the remaining asset life. Any impairment loss is measured by the excess of carrying value over fair value.

Determining the fair value of a reporting unit under the goodwill impairment tests and determining the fair value of other intangible assets are judgmental and often involve the use of significant estimates and assumptions. Estimates of fair value are primarily determined using the discounted cash flows method, which uses significant estimates and assumptions including projected future cash flows, discount rates reflecting the market rate of return and projected growth rates. Future events may impact such estimates and assumptions and could cause the Company to conclude that our goodwill or intangible assets have become impaired, which would result in recording an impairment loss.

Bank Owned Life Insurance

The Bank has purchased life insurance policies on certain employees, key executives and directors. Bank owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement.

Treasury Stock

Treasury stock acquisitions are recorded at cost. Subsequent sales of treasury stock are recorded on an average cost basis. Gains on the sale of treasury stock are credited to additional paid-in-capital. Losses on the sale of treasury stock are charged to additional paid-in-capital to the extent of previous gains, otherwise charged to retained earnings.

Income Taxes

Income taxes are accounted for under the asset and liability method. Deferred income taxes are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred taxes of a change in tax rates is recognized in income in the period that includes the enactment date. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized. The realization of deferred tax assets is primarily dependent upon the generation of adequate future taxable income. The Company recognizes interest accrued and penalties related to unrecognized tax benefits in income tax expense.

Tax positions are recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50 percent likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded.

Pension Costs

The Company has a qualified, noncontributory, defined benefit pension plan covering substantially all of its employees, as well as supplemental employee retirement plans to certain current and former executives and a defined benefit postretirement healthcare plan that covers certain employees. Costs associated with these plans, based on actuarial computations of current and future benefits for employees, are charged to current operating expenses.

Stock-Based Compensation

The Company maintains various long-term incentive stock benefit plans under which restricted stock units are granted to certain directors and key employees. Compensation expense is recognized in the consolidated statements of income over the requisite service period, based on the grant-date fair value of the award. For restricted stock units, compensation expense is recognized ratably over the vesting period for the fair value of the award, measured at the grant date.

Earnings Per Share

Basic earnings per share (“EPS”) excludes dilution and is computed by dividing income available to common stockholders by the weighted average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock or resulted in the issuance of common stock that then shared in the earnings of the entity (such as the Company’s dilutive restricted stock units).

Comprehensive Income (Loss)

At the Company, comprehensive income (loss) represents net income plus OCI, which consists primarily of the net change in unrealized gains (losses) on AFS debt securities for the period, changes in the funded status of employee benefit plans and unrealized gains (losses) on derivatives designated as hedging instruments. AOCI represents the net unrealized gains (losses) on AFS debt securities, the previously unrecognized portion of the funded status of employee benefit plans and the fair value of instruments designated as hedging instruments, net of income taxes, as of the consolidated balance sheet dates.

Derivative Instruments and Hedging Activities

The Company records all derivatives on the consolidated balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting.

When the Company purchases or sells a portion of a commercial loan that has an existing interest rate swap, it may enter into a risk participation agreementto provide credit protection to the financial institution that originated the swap transaction should the borrower fail to perform on its obligation. The Company enters into both risk participation agreements in which it purchases credit protection from other financial institutions and those in which it provides credit protection to other financial institutions. Any fee paid to the Company under a risk participation agreement is in consideration of the credit risk of the counterparties and is recognized in the income statement. Credit risk on the risk participation agreements is determined after considering the risk rating, PD and LGD of the counterparties.

Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. The Company may enter into derivative contracts that are intended to economically hedge certain of its risks, even though hedge accounting does not apply or the Company elects not to apply hedge accounting.

For derivatives designated as fair value hedges, changes in the fair value of the derivative and the hedged item related to the hedged risk are recognized in earnings.

Business Combinations

Business combinations are accounted for under the acquisition method of accounting. Acquired assets, including separately identifiable intangible assets, and assumed liabilities are recorded at their acquisition date estimated fair values. The excess of the cost of acquisition over these fair values is recognized as goodwill. During the measurement period, which cannot exceed one year from the acquisition date, changes to estimated fair values are recognized as an adjustment to goodwill. Certain transaction costs are expensed as incurred. See Note 3 for additional information.

Fair Value Measurements

GAAP states that fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Fair value measurements are not adjusted for transaction costs. A fair value hierarchy exists within GAAP that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below:

Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities;

Level 2 - Quoted prices for similar assets or liabilities in active markets, quoted prices in markets that are not active or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability; and

Level 3 - Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity).

A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement.

The types of instruments valued based on quoted market prices in active markets include most U.S. government and agency securities, many other sovereign government obligations, liquid mortgage products, active listed equities and most money market securities. Such instruments are generally classified within Level 1 or Level 2 of the fair value hierarchy. The Company does not adjust the quoted prices for such instruments.

The types of instruments valued based on quoted prices in markets that are not active, broker or dealer quotations or quotes from alternative pricing sources with reasonable levels of price transparency include most investment-grade and high-yield corporate bonds, less liquid mortgage products, less liquid agency securities, less liquid listed equities, state, municipal and provincial obligations and certain physical commodities. Such instruments are generally classified within Level 2 of the fair value hierarchy. Certain common equity securities are reported at fair value utilizing Level 1 inputs (exchange quoted prices). Other investment securities are reported at fair value utilizing Level 1 and Level 2 inputs. The prices for Level 2 instruments are obtained through an independent pricing service or dealer market participants with whom the Company has historically transacted both purchases and sales of investment securities. Prices obtained from these sources include prices derived from market quotations and matrix pricing. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things. Management reviews the methodologies used by its third-party providers in pricing the securities.

Level 3 is for positions that are not traded in active markets or are subject to transfer restrictions. Valuations are adjusted to reflect illiquidity and/or non-transferability and such adjustments are generally based on available market evidence. In the absence of such evidence, management’s best estimate will be used. Management’s best estimate consists of both internal and external support on certain Level 3 investments. Subsequent to inception, management only changes Level 3 inputs and assumptions when corroborated by evidence such as transactions in similar instruments, completed or pending third-party transactions in the underlying investment or comparable entities, subsequent rounds of financing, recapitalizations and other transactions across the capital structure, offerings in the equity or debt markets and changes in financial ratios or cash flows.

Other Financial Instruments

The Company is a party to certain financial instruments with off-balance-sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit, unused lines of credit, standby letters of credit and certain agricultural real estate loans sold to investors with recourse, with the sold portion having a government guarantee that is assignable back to the Company upon repurchase of the loan in the event of default. The Company’s policy is to record such instruments when funded.

Standby letters of credit are conditional commitments issued to guarantee the performance of a customer to a third-party. The risk involved in issuing standby letters of credit is essentially the same as the credit risk involved in extending loan facilities to customers and letters of credit are subject to the same credit origination, portfolio maintenance and management procedures in effect to monitor other credit and off-balance sheet products. Under the standby letters of credit, the Company is required to make payments to the beneficiary of the letters of credit upon request by the beneficiary contingent upon the customer’s failure to perform under the terms of the underlying contract with the beneficiary. Standby letters of credit typically haveone year expirations with an option to renew upon annual review. The Company typically receives a fee for these transactions. The fair value of standby letters of credit is recorded upon inception.

Repurchase Agreements

Repurchase agreements are accounted for as secured financing transactions since the Company maintains effective control over the transferred securities and the transfer meets the other criteria for such accounting. Obligations to repurchase securities sold are reflected as a liability in the consolidated balance sheets. The securities underlying the agreements are delivered to a custodial account for the benefit of the counterparties with whom each transaction is executed. The counterparties, who may sell, loan or otherwise dispose of such securities to other parties in the normal course of their operations, agree to resell to the Company the same securities at the maturities of the agreements.

Revenue from Contracts with Customers

The Company recognizes revenue in accordance with ASU 2014-09, Revenue from Contracts with Customers (Accounting Standards Codification (“ASC”) Topic 606)(“ASC 606”), and all subsequent ASUs that modified ASC 606. ASC 606 does not apply to revenue associated with financial instruments, including revenue from loans and securities and certain noninterest income streams such as fees associated with mortgage servicing rights, financial guarantees, derivatives and certain credit card fees are also not in scope. ASC 606 is applicable to noninterest revenue streams such as retirement plan administration fees, trust and asset management income, deposit related fees and annuity and insurance commissions. Noninterest revenue streams in-scope of ASC 606 are discussed below.

Service Charges on Deposit Accounts

Service charges on deposit accounts consist of overdraft fees, monthly service fees, check orders and other deposit account related fees. Overdraft, monthly service, check orders and other deposit account related fees are transactional based, and therefore, the Company’s performance obligation is satisfied, and related revenue recognized, at a point in time. Payment for service charges on deposit accounts is primarily received immediately or in the following month through a direct charge to customers’ accounts.

Card Services Income

ATM fees are primarily generated when a Company cardholder uses a non-Company ATM or a non-Company cardholder uses a Company ATM. Debit card income is primarily comprised of interchange fees earned whenever the Company’s debit cards are processed through card payment networks. The Company’s performance obligations for these revenue streams are satisfied, and related revenue recognized, when the services are rendered or upon completion. Payment is typically received immediately or in the following month.

Retirement Plan Administration Fees

Retirement plan administration fees are primarily generated for services related to the recordkeeping, administration and plan design solutions of defined benefit, defined contribution and revenue sharing plans. Revenue is recognized in arrears for services already provided in accordance with fees established in contracts with customers or based on rates agreed to with investment trade platforms based on ending investment balances held. The Company’s performance obligation is satisfied, and related revenue recognized based on services completed or ending investment balances, for which receivables are recorded at the time of revenue recognition.

Wealth Management

Wealth Management revenue primarily is comprised of trust and other financial services revenue. Trust and asset management income is primarily comprised of fees earned from the management and administration of trusts, pensions and other customer assets. The Company’s performance obligation is generally satisfied with the resulting fees recognized monthly, based upon services completed or the month-end market value of the assets under management and the applicable fee rate. Payment is generally received shortly after services are rendered or a few days after month end through a direct charge to customers’ accounts. The Company does not earn performance-based incentives. Financial services revenue primarily consists of commissions received on brokered investment product sales. For other financial services revenue, the Company’s performance obligation is generally satisfied upon the issuance of the annuity policy. Shortly after the policy is issued, the carrier remits the commission payment to the Company, and the Company recognizes the revenue. The Company does not earn a significant amount of trailing commission fees on brokered investment product sales. The majority of the trailing commission fees are calculated based on a percentage of market value of a period end and revenue is recognized when an investment product’s market value can be determined.

Insurance Revenue

Insurance and other financial services revenue primarily consists of commissions received on insurance. The Company acts as an intermediary between the Company’s customer and the insurance carrier. The Company’s performance obligation related to insurance sales for both property and casualty insurance and employee benefit plans is generally satisfied upon the later of the issuance or effective date of the policy. The Company earns performance based incentives, commonly known as contingent payments, which usually are based on certain criteria established by the insurance carrier such as premium volume, growth and insured loss ratios. Contingent payments are accrued for based upon management’s expectations for the year. Commission expense associated with sales of insurance products is expensed as incurred. The Company does not earn a significant amount of trailing commission fees on insurance product sales. The majority of the trailing commission fees are calculated based on a percentage of market value of a period end and revenue is recognized when an investment product’s market value can be determined.

Other

Other noninterest income consists of other recurring revenue streams such as account and loan fees, interest rate swap fees, safe deposit box rental fees and other miscellaneous revenue streams. These revenue streams are primarily transactional based and payment is received immediately or in the following month, and therefore, the Company’s performance obligation is satisfied, and the related revenue is recognized, at a point in time.

The following table presents noninterest income, segregated by revenue streams in-scope and out-of-scope of ASC 606:

Contract Balances

A contract asset balance occurs when an entity performs a service for a customer before the customer pays consideration or before payment is due, which would result in contract receivables or assets, respectively. A contract liability balance is an entity’s obligation to transfer a service to a customer for which the entity has already received payment or for which payment is due from the customer. The Company’s noninterest revenue streams are largely based on transactional activity, or standard month-end revenue accruals such as asset management fees based on month-end market values. Consideration is often received immediately or shortly after the Company satisfies its performance obligation and revenue is recognized. The Company does not typically enter into long-term revenue contracts with customers, and therefore, does not experience significant contract balances.

Contract Acquisition Costs

ASC 606 requires the capitalization, and subsequently amortization into expense, of certain incremental costs of obtaining a contract with a customer if these costs are expected to be recovered. The incremental costs of obtaining a contract are those costs that an entity incurs to obtain a contract with a customer that it would not have incurred if the contract had not been obtained. The Company elected the practical expedient, which allows immediate expensing of contract acquisition costs when the asset that would have resulted from capitalizing these costs would have been amortized in one year or less, and did not capitalize any contract acquisition costs as of or during the year ended December 31, 2025, 2024 and 2023.

Trust Operations

Assets held by the Company in a fiduciary or agency capacity for its customers are not included in the accompanying consolidated balance sheets, since such assets are not assets of the Company.

Subsequent Events

The Company has evaluated subsequent events for potential recognition and/or disclosure and none were identified.

Recently Adopted Accounting Standards

In December 2023, the FASB issued ASU 2023-09, Improvements to Income Tax Disclosures, in response to requests from investors, lenders, creditors and other allocators of capital for enhanced income tax disclosures to support capital allocation decisions. The ASU requires enhanced disclosures primarily related to existing rate reconciliation and income taxes paid information to help investors better assess how the Company’s operations and related tax risks and tax planning and operational opportunities affect the Company’s tax rate and prospects for future cash flows. The ASU 2023-09 improves the transparency of income tax disclosures. The amendments in this ASU are effective for the Company for annual periods beginning after December 15, 2024, and should be applied on a prospective basis. The Company adopted ASU 2023-09 on December 31, 2025 and applied the new disclosure requirements. See Note 11 for additional information.

Accounting Standards Issued Not Yet Adopted

In November 2024, the FASB issued ASU 2024-03, Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses, that addresses longstanding investor requests for more information of expenses included in the expense captions presented on the face of the income statement. The ASU will require a tabular disclosure that disaggregates certain income statement expenses including employee compensation, depreciation and intangible asset amortization. In January 2025, the FASB issued ASU 2025-01, Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date, which revises the effective date of ASU 2024-03. The ASU will become effective in the annual reporting periods beginning after December 15, 2026, and early adoption is permitted. Aside from complying with the new disclosure requirements, the adoption is not expected to have a material impact on the consolidated financial statements.

In December 2025, the FASB issued ASU 2025-11, Interim Reporting (Topic 270): Narrow-Scope Improvements, which clarifies the guidance in Topic 270 to improve the consistency of interim financial reporting. The ASU provides a comprehensive list of required interim disclosures and introduces a disclosure principle requiring entities to disclose events since the end of the last annual reporting period that have a material impact on the entity. ASU 2025-11 is effective for fiscal years beginning after December 15, 2027, including interim periods within those fiscal years, with early adoption permitted. Aside from complying with the new disclosure requirements, the adoption is not expected to have a material impact on the consolidated financial statements.

Current and Prior Period Acquisitions

On May 2, 2025, the Company completed the acquisition of Evans Bancorp, Inc. (“Evans”) through the merger of Evans with and into the Company, with the Company surviving the merger. Total consideration for the acquisition was $221.8 million in common stock. Evans, with assets of $2.19 billion at December 31, 2024, was headquartered in Williamsville, New York. Its primary subsidiary, Evans Bank, National Association (“Evans Bank”), was a federally-chartered national banking association operating 18 banking locations in Western New York. The acquisition enhances the Company’s presence in Western New York, including the Buffalo and Rochester communities. In connection with the acquisition, the Company issued 5.1 million shares of common stock and acquired approximately $131.2 million of identifiable net assets. Goodwill of $90.6 million was recognized as a result of the merger and is not amortizable or deductible for tax purposes. During the fourth quarter of 2025, the Company revised the accrued income taxes and deferred taxes associated with the Evans acquisition, which resulted in a $0.8 million decrease in goodwill. The effects of the acquired assets and liabilities have been included in the consolidated financial statements since May 2, 2025. As a result of the full integration of the operations of Evans, it is not practicable to determine all revenue or net income included in the Company’s operating results relating to Evans since the date of acquisition as Evans results cannot be separately identified.

On August 11, 2023, the Company completed the acquisition of Salisbury Bancorp, Inc. (“Salisbury”) through the merger of Salisbury with and into the Company, with the Company surviving the merger, for $161.7 million in stock. Salisbury Bank and Trust Company, Salisbury’s subsidiary, was a Connecticut-chartered commercial bank headquartered in Lakeville, Connecticut, operating 13 banking offices. The acquisition enhances the Company’s presence in Massachusetts’ Berkshire county, and extends its footprint into New York’s Dutchess, Orange and Ulster counties and Connecticut’s Litchfield county. In connection with the acquisition, the Company issued 4.32 million shares of common stock and acquired approximately $1.46 billion of identifiable assets. Goodwill of $79.7 million was recognized as a result of the merger and is not amortizable or deductible for tax purposes. During the fourth quarter of 2023, the Company revised the estimated fair value of premises and equipment, net and related deferred income taxes based upon receipt of land and building appraisals, which resulted in a $1.7 million increase in goodwill. The effects of the acquired assets and liabilities have been included in the consolidated financial statements since that date. As a result of the full integration of the operations of Salisbury, it is not practicable to determine all revenue or net income included in the Company’s operating results relating to Salisbury since the date of acquisition as Salisbury results cannot be separately identified.

The acquisitions of Evans and Salisbury are being accounted for as business combinations in accordance with ASC 805, “Business Combinations” (“ASC 805”), using the acquisition method of accounting. Accordingly, as of the date of the acquisition, the Company recorded the assets acquired, liabilities assumed and consideration paid at fair value based on management’s best estimates using information available at the date of the acquisition. These estimates were subject to adjustment based on updated information not available at the time of the acquisition and all amounts have now been finalized. The amount of goodwill arising from the acquisition consists largely of the synergies and economies of scale expected from combining the operations of the Company with Evans and Salisbury.

The following table summarizes the estimated fair value of the assets acquired and liabilities assumed:

The following is a description of the valuation methodologies used to estimate the fair values of major categories of assets acquired and liabilities assumed. The Company used an independent valuation specialist to assist with the determination of fair values for certain acquired assets and assumed liabilities.

Cash and due from banks - The estimated fair value was determined to approximate the carrying amount of these assets.

Securities available for sale - The estimated fair value of the AFS investment portfolio was primarily determined using quoted market prices and dealer quotes. The investment securities were sold immediately after the merger and no gains or losses were recorded.

Securities held to maturity- The estimated fair value of the HTM investment portfolio, which consisted of local municipal securities, was retained at par, which is estimated to be equal to fair value.

Loans - Theestimated fair value of loans were based on a discounted cash flow methodology applied on a pooled basis. Loans were first segmented by purchased credit deteriorated (“PCD”) or non-purchased credit deteriorated (“non-PCD”) status, and then further grouped according to Federal Deposit Insurance Corporation (“FDIC”) call report segmentation. The valuation considered key loan characteristics including loan type, term, rate, payment schedule and loan performance attributes. Certain key assumptions related to prepayment speeds, PD, LGD and discount rate were also considered. The discount rates applied were based on a build-up approach factoring in the funding mix, servicing costs, liquidity premium and factors related to performance risk.

Core deposit intangible - The core deposit intangible was valued utilizing the cost savings method approach, which recognizes the cost savings represented by the expense of maintaining the core deposit base versus the cost of an alternative funding source. The valuation incorporated assumptions related to account retention, discount rates, deposit interest rates, deposit maintenance costs and alternative funding rates.

Wealth management customer intangible - The wealth management customer intangible was valued utilizing the income approach, which employs a present value analysis, which calculates the expected after-tax cash flow benefits of the net revenues generated by the acquired customers over the expected lives of the acquired customers, discounted at a long-term market-oriented after-tax rate of return on investment. The value assigned to the acquired customers represents the future economic benefit from acquiring the customers (net of operating expenses).

Deposits - The fair value of noninterest bearing demand deposits, interest-bearing checking, money market and savings deposit accounts were assumed to approximate the carrying value as these accounts have no stated maturity and are payable on demand. Certificate of deposit (“CD”) (time deposit accounts) were valued at the present value of the certificates’ expected contractual payments discounted at market rates for similar certificates which approximates carrying value.

Borrowings - The estimated fair value of short-term borrowings was determined to approximate stated value. Long-term debt, subordinated debt and junior subordinated debt were valued using a discounted cash flow approach incorporating a discount rate that incorporated similar terms, maturity and credit rating.

Accounting for Acquired Loans -Acquired loans are classified into two categories: PCD loans and non-PCD loans. PCD loans are defined as a loan or group of loans that have experienced more than insignificant credit deterioration since origination. Non-PCD loans had an allowance established on acquisition date, which is recognized as an expense through the provision for credit losses. For PCD loans, an allowance is recognized by adding it to the fair value of the loan, which is the amortized cost. There is no provision for credit loss expense recognized on PCD loans because the initial allowance is established by grossing-up the amortized cost of the PCD loan. The allowance for credit losses on non-PCD loans of $13.0 million for Evans and $8.8 million for Salisbury was recorded through the provision for loan losses within the consolidated statements of income. The following table provides details related to the fair value of acquired PCD loans.

The non-PCD loans acquired from Evans had an acquisition date fair value of $1.37 billion, compared to $1.43 billion in gross contractual amounts receivable. At the acquisition date, the Company estimated that $13.0 million of the contractual cash flows were not expected to be collected.

Direct costs related to the acquisitions were expensed as incurred. Acquisition integration-related expenses were $19.5 million, $1.5 million and $10.0 million during the years ended 2025, 2024 and 2023, respectively. These amounts have been separately stated in the consolidated statements of income and are included in operating activities in the consolidated statements of cash flows.

Supplemental Pro Forma Financial Information (Unaudited)

The following table presents certain unaudited pro forma financial information for illustrative purposes only, for the years ended December 31, 2025 and 2024, as if Evans had been acquired on January 1, 2024. This unaudited pro forma information combines the historical results of Evans with the Company’s consolidated historical results and includes certain adjustments reflecting the estimated impact of certain fair value adjustments for the respective periods. The pro forma information is not indicative of what would have occurred had the acquisition taken place at the beginning of the year prior to the acquisition. The unaudited pro forma information does not consider any changes to the provision expense resulting from recording loan assets at fair value, cost savings or business synergies. As a result, actual amounts would have differed from the unaudited pro forma information presented and the differences could be significant.

Other Acquisitions

In November 2024, the Company, through its subsidiary, NBT Bank, National Association, completed its acquisition of certain assets of PACO, Inc., a third-party administration business based in West Des Moines, Iowa for a total consideration of $3.3 million. As part of the acquisition, the Company recorded goodwill of $0.7 million and a $2.9 million contingent consideration recorded in other liabilities on the consolidated balance sheets as of December 31, 2024.

In July 2024, the Company, through its subsidiary, NBT Insurance Agency, LLC, a full-service regional insurance agency, completed the acquisition of substantially all of the assets of Karl W. Reynard, Inc. located in Stamford, NY for a total consideration of $1.2 million. Karl W. Reynard, Inc. was a long-established property and casualty agency offering personal and commercial lines. This strategic acquisition expands the presence of NBT Insurance Agency, LLC in the Catskills, where the agency and the Bank are well established. As part of the acquisition, the Company recorded goodwill of $0.2 million and a $1.0 million contingent consideration recorded in other liabilities on the consolidated balance sheets as of December 31, 2024.

In July 2023, the Company, through its subsidiary, EPIC Advisors Inc., completed its acquisition of certain assets of Retirement Direct, LLC, a retirement plan administration business based near Charlotte, North Carolina for a total consideration of $2.8 million. As part of the acquisition, the Company recorded goodwill of $0.9 million and a $1.0 million contingent consideration recorded in other liabilities on the consolidated balance sheets as of December 31, 2023.

The operating results of the acquired company is included in the consolidated results after the date of acquisition.

The amortized cost, estimated fair value and unrealized gains (losses) of AFS securities are as follows:

There wasno allowance for credit losses on AFS securities as of December 31, 2025 and 2024.

During the year ended December 31, 2023, there were $4.5 million of gross realized losses reclassified out of AOCI and into earnings and the Company incurred a $5.0 million loss on the write-off of an AFS corporate debt security from a subordinated debt investment of a financial institution that failed. These losses were reclassified out of AOCI and into earnings in net securities gains (losses) in the consolidated statements of income. During the year ended December 31, 2024, the Company sold the previously written-off security and recognized a gain of $2.3 million into earnings in net securities gains (losses) in the consolidated statements of income. During the year ended December 31, 2025, there wereno gains or losses reclassified out of AOCI and into earnings.

The amortized cost, estimated fair value and unrealized gains (losses) of HTM securities are as follows:

At December 31, 2025 and 2024, all of the mortgage-backed HTM securities were comprised of U.S. government agency and government-sponsored enterprises securities.

The Company recordedno gains from calls on HTM securities for the years ended December 31, 2025, 2024 and 2023.

AFS and HTM securities with amortized costs totaling $1.87 billion at December 31, 2025 and $1.60 billion at December 31, 2024, were pledged to secure public deposits and for other purposes required or permitted by law. Additionally, at December 31, 2025 and 2024, AFS and HTM securities with an amortized cost of $207.6 million and $234.2 million, respectively, were pledged as collateral for securities sold under repurchase agreements.

The following table sets forth information with regard to gains and (losses) on equity securities:

As of December 31, 2025 and 2024 the carrying value of equity securities without readily determinable fair values was $1.0 million. The Company performed a qualitative assessment to determine whether the investments were impaired and identified no areas of concern as of December 31, 2025 and 2024. There wereno impairments, or downward or upward adjustments recognized for equity securities without readily determinable fair values during the years ended December 31, 2025 and 2024.

The following table sets forth information with regard to contractual maturities of debt securities at December 31, 2025:

Maturities of mortgage-backed, collateralized mortgage obligations and asset-backed securities are stated based on their estimated average lives. Actual maturities may differ from estimated average lives or contractual maturities because, in certain cases, borrowers have the right to call or prepay obligations, with or without call or prepayment penalties.

Except for U.S. government securities and government-sponsored enterprises securities, there wereno holdings, when taken in the aggregate, of any single issuer that exceeded 10% of consolidated stockholders’ equity at December 31, 2025, 2024 and 2023.

The following table sets forth information with regard to investment securities with unrealized losses, for which an allowance for credit losses has not been recorded, segregated according to the length of time the securities were in a continuous unrealized loss position:

The Company does not believe the AFS securities that were in an unrealized loss position as of December 31, 2025 and 2024, which consisted of 350 and 401 individual securities, respectively, represented a credit loss impairment. AFS debt securities in unrealized loss positions are evaluated for impairment related to credit losses at least quarterly. As of December 31, 2025 and 2024, the majority of the AFS securities in an unrealized loss position consisted of debt securities issued by U.S. government agencies or U.S. government-sponsored enterprises that carry the explicit and/or implicit guarantee of the U.S. government, which are widely recognized as “risk-free” and have a long history of zero credit losses. Total gross unrealized losses were primarily attributable to changes in interest rates, relative to when the investment securities were purchased, and not due to the credit quality of the investment securities. The Company does not intend to sell, nor is it more likely than not that the Company will be required to sell the securities before recovery of their amortized cost basis, which may be at maturity. The Company elected to exclude AIR from the amortized cost basis of debt securities. AIR on AFS debt securities totaled $5.6 million and $4.4 million at December 31, 2025 and 2024, respectively, and is excluded from the estimate of credit losses and reported in theother assets financial statement line.

None of the Bank’s HTM debt securities were past due or on nonaccrual status as of December 31, 2025 and 2024. There wasno accrued interest reversed against interest income for the years ended December 31, 2025 and 2024 as all securities remained in accrual status. In addition, there wereno collateral-dependent HTM debt securities as of December 31, 2025 and 2024. There wasno allowance for credit losses on HTM securities as of December 31, 2025 and 2024. As of December 31, 2025 and 2024,65% and 66%, respectively, of the Company’s HTM debt securities were issued by U.S. government agencies or U.S. government-sponsored enterprises with bond ratings of A to AAA. These securities carry the explicit and/or implicit guarantee of the U.S. government, which are widely recognized as “risk free,” and have a long history of zero credit losses. Therefore, the Company did not record an allowance for credit losses for these securities as of December 31, 2025 and 2024. The remaining HTM debt securities at December 31, 2025 and 2024 were comprised of state and municipal obligations with bond ratings of A to AAA excluding the $85.7 million and $84.7 million, respectively, of local municipal bonds which are not rated. Based on the Company’s CECL methodology, the expected credit loss on the HTM municipal bond portfolio was deemed immaterial, therefore no allowance for credit loss was recorded as of December 31, 2025 and 2024. AIR on HTM debt securities totaled $3.9 million and $4.4 million at December 31, 2025 and 2024, respectively, and is excluded from the estimate of credit losses and reported in theother assets financial statement line.

5. Loans

A summary of loans, net of deferred fees and origination costs, by category(1) is as follows:

(1) Loans are summarized by business line which does not align to how the Company assesses credit risk in the allowance for credit losses under CECL.

Included in the above loans are net deferred loan origination (fees) costs totaling $(37.9) million and $(64.7) million at December 31, 2025 and 2024, respectively. The Company had $1.1 million and $2.4 million of residential mortgage loans held for sale as of December 31, 2025 and 2024, respectively. There wereno residential solar loans held for sale as of December 31, 2025. The Company had $7.3 million of residential solar loans held for sale as of December 31, 2024.

The total amount of loans serviced by the Company for unrelated third parties was $1.28 billion and $982.5 million at December 31, 2025 and 2024, respectively. At December 31, 2025 and 2024, the Company had $2.1 million and $0.9 million, respectively, of mortgage servicing rights.

At December 31, 2025 and 2024, the Company serviced $23.2 million and $24.7 million, respectively, of agricultural loans sold with recourse. Due to sufficient collateral on these loans and government guarantees, no reserve is considered necessary at December 31, 2025 and 2024.

FHLB advances are collateralized by a blanket lien on the Company’s residential mortgages.

In the ordinary course of business, the Company has made loans at prevailing rates and terms to directors, officers and other related parties. Such loans, in management’s opinion, do not present more than the normal risk of collectability or incorporate other unfavorable features. The aggregate amount of loans outstanding to qualifying related parties and changes during the years are summarized as follows:

The allowance for credit losses totaled $138.0 million at December 31, 2025, compared to $116.0 million at December 31, 2024. The allowance for credit losses as a percentage of loans was 1.19% at December 31, 2025, compared to 1.16% at December 31, 2024.

The allowance for credit losses calculation incorporated a 6-quarter forecast period to account for forecast economic conditions under each scenario utilized in the measurement. For periods beyond the 6-quarter forecast, the model reverts to long-term economic conditions over a 4-quarter reversion period on a straight-line basis. The Company considers a baseline, upside and downside economic forecast in measuring the allowance. Starting in the second quarter of 2025, the Company included an additional downside scenario with stagflation conditions, which is characterized as an economic environment where inflation rises alongside unemployment. Stagflation was identified as an emerging risk as tariff policies impacted the economy.

The quantitative model as of December 31, 2025 incorporated a baseline economic outlook along with an alternative upside scenario and two equally weighted downside scenarios, recessionary conditions and stagflation, sourced from a reputable third-party to accommodate other potential economic conditions in the model. At December 31, 2025, the weightings were 65%, 5% and 30% for the baseline, upside and downside economic forecast scenarios, respectively. The baseline outlook reflected an economic environment where the northeast unemployment rate increases from 4.5% in the first quarter of 2026 to 4.8% by the end of the forecast period, with a peak northeast unemployment rate of 4.9% in the fourth quarter of 2026. National Gross Domestic Product (“GDP”) annualized growth (on a quarterly basis) is expected to start the first quarter of 2026 at approximately 2.55% and decrease to 1.8% by the end of the forecast period. Key assumptions in the baseline economic outlook included the Federal Reserve cutting rates with one 25 basis point cut at the December meeting and the economy remaining at full employment. The alternative upside scenario assumes improved economic conditions from the baseline outlook. Under this scenario, northeast unemployment falls from 4.4% in the fourth quarter of 2025 to 4.0% in the second quarter of 2026 and eventually settles at 4.1% by the end of the forecast period. The alternative downside scenario with recessionary conditions assumes deteriorated economic conditions from the baseline outlook. Under this scenario, northeast unemployment rises from 4.4% in the fourth quarter of 2025 to a peak of 7.8% in the first quarter of 2027. The alternative downside stagflation scenario assumes deteriorated economic conditions from the baseline outlook. Under this scenario, northeast unemployment rises from 4.4% in the fourth quarter of 2025 to 6% by the end of the forecast period in the second quarter of 2027, with a peak northeast unemployment rate of 8.2% in the first quarter of 2028. These scenarios and their respective weightings are evaluated at each measurement date and reflect management’s expectations as of December 31, 2025. Additional qualitative adjustments were made for factors not incorporated in the forecasts or the model, such as loss rate expectations for certain loan pools, reversion adjustments for the stagflation scenario and recent trends in asset value indices. Additional monitoring for industry concentrations, loan growth and policy exceptions was also conducted.

The quantitative model as of December 31, 2024 incorporated a baseline economic outlook along with an alternative downside scenario sourced from a reputable third-party to accommodate other potential economic conditions in the model. At December 31, 2024, the weightings were 80% and 20% for the baseline and downside economic forecasts, respectively. The baseline outlook reflected a northeast unemployment rate environment starting at 4.1% and increasing slightly during the forecast period to 4.2%. Northeast GDP annualized growth (on a quarterly basis) is expected to start the first quarter of 2025 at approximately 3.8% before decreasing to a low of 2.6% in the third quarter of 2025 and then increasing to 3.9% by the end of the forecast period. Key assumptions in the baseline economic outlook includedtwo 25 basis point federal funds rate cuts in 2025, quantitative tightening ending in early 2025, a post-election fiscal outlook with lower spending, lower taxes, and higher tariffs, and the economy currently being near full employment. The alternative downside scenario assumed deteriorated economic conditions from the baseline outlook. Under this scenario, northeast unemployment increases to a peak of 7.5% in the first quarter of 2026. These scenarios and their respective weightings are evaluated at each measurement date and reflect management’s expectations as of December 31, 2024. Additional qualitative adjustments were made for factors not incorporated in the forecasts or the model, such as loss rate expectations for certain loan pools, considerations for inflation and recent trends in asset value indices. Additional monitoring for industry concentrations, loan growth and policy exceptions was also conducted.

The quantitative model as of December 31, 2023 incorporated a baseline economic outlook along with an alternative downside scenario sourced from a reputable third-party to accommodate other potential economic conditions in the model. At December 31, 2023, the weightings were 70% and 30% for the baseline and downside economic forecasts, respectively. The baseline outlook reflected an unemployment rate environment starting at 3.8% and increasing slightly during the forecast period to 4.1%. Northeast GDP annualized growth (on a quarterly basis) was expected to start the first quarter of 2024 at approximately 3.7% before decreasing to a low of 2.9% in the third quarter of 2024 and then increasing to 3.8% by the end of the forecast period. Other utilized economic variable forecastsare mixed compared to the prior year, with retail sales improving, business output mixed and housing starts down. Key assumptions in the baseline economic outlook included currently being in a full employment economy, continued tapering of the Federal Reserve balance sheet and the Federal Open Market Committee beginning to cut rates in the second quarter of 2024. The alternative downside scenario assumed deteriorated economic conditions from the baseline outlook. Under this scenario, northeast unemployment increases to a peak of 7.0% in the first quarter of 2025. These scenarios and their respective weightings are evaluated at each measurement date and reflect management’s expectations as of December 31, 2023. Additional qualitative adjustments were made for factors not incorporated in the forecasts or the model, such as loss rate expectations for certain loan pools, considerations for inflation and recent trends in asset value indices. Additional monitoring for industry concentrations, loan growth and policy exceptions was also conducted.

There were $336.4 million of PCD loans acquired from Evans during the year ended December 31, 2025 which resulted in an allowance for credit losses at acquisition of $7.7 million. There wereno loans purchased with credit deterioration during the year ended December 31, 2024. During 2025, the Company purchased $21.3 million of residential loans at a 4.5% premium with a $234 thousand allowance for credit losses recorded for these loans. During 2024, the Company purchased $3.0 million of residential loans at a 7.0% premium with a $31 thousand allowance for credit losses recorded for these loans.

The Company made a policy election to report AIR in theother assets line item on the consolidated balance sheets. AIR on loans totaled $42.5 million at December 31, 2025 and $34.8 million at December 31, 2024 and withno estimated allowance for credit losses related to AIR at December 31, 2025 and 2024 as it is excluded from amortized cost.

The Company’s January 1, 2023 adoption of ASU 2022-02, Financial Instruments - CECL Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures resulted in an insignificant change to its methodology for estimating the allowance for credit losses on TDRs. The ASU eliminated the guidance on TDRs and requires an evaluation on all loan modifications to determine if they result in a new loan or a continuation of the existing loan. The decrease in allowance for credit loss on TDR loans relating to the adoption of ASU 2022-02 was $0.6 million.

The following tables present the activity in the allowance for credit losses by our portfolio segment:

The allowance for credit losses as of December 31, 2025 increased compared to December 31, 2024 primarily due to the recording of $20.7 million of allowance for acquired Evans loans as of the acquisition date, which included both the $13.0 million of non-PCD allowance recognized through the provision for loan losses and the $7.7 million of PCD allowance reclassified from loans. In addition, the allowance for credit losses increased due to deterioration in the economic forecast including the change in the forecast scenarios and weightings, partially offset by the shift in loan composition driven by other consumer and residential solar portfolios that are in a planned run-off status. The allowance for credit losses as of December 31, 2024 increased compared to December 31, 2023 primarily due to providing for current year loan growth, the slowing of prepayment speed assumptions, including the changes in prepayment model assumptions. These increases to the allowance for credit losses were partially offset by the change in forecast scenario weightings from 70% baseline and 30% downside to 80% baseline and 20% downside, and the shift in loan composition driven by other consumer and residential solar portfolios that are in a planned run-off status. The increase in the allowance for credit losses from December 31, 2022 to December 31, 2023 was primarily due to the recording of $14.5 million of allowance for acquired Salisbury loans as of the acquisition date, which included both the $8.8 million of non-PCD allowance recognized through the provision for loan losses and the $5.8 million of PCD allowance reclassified from loans.

Individually Evaluated Loans

The threshold for evaluating commercial loans risk graded substandard or doubtful, and nonperforming loans specifically evaluated for individual credit loss is $1.0 million. As of December 31, 2025, five relationships with an amortized cost basis of $12.2 million were identified for individual credit loss evaluation. These relationships werein nonaccrual status withno allowance for credit loss as the fair value of the underlying collateral supported theamortized cost. As of December 31, 2024, three relationships were identified for individual credit loss evaluation, had an amortized cost basis of $28.8 million andwerein nonaccrual status withno allowance for credit loss.

The following table sets forth information with regard to past due and nonperforming loans by loan segment:

Credit Quality Indicators

The Company has developed an internal loan grading system to evaluate and quantify the Company’s loan portfolio with respect to quality and risk, focusing on, among other things, borrower’s financial strength, experience and depth of borrower’s management, primary and secondary sources of repayment, payment history, nature of the business and industry outlook. The internal grading system enables the Company to monitor the quality of the entire loan portfolio on a consistent basis and provide management with an early warning system, which facilitates recognition of and response to problem loans and potential problem loans.

Commercial Grading System

For C&I and CRE loans, the Company uses a grading system that relies on quantifiable and measurable characteristics when available. This includes comparison of financial strength to available industry averages, comparison of transaction factors (loan terms and conditions) to loan policy and comparison of credit history to stated repayment terms and industry averages. Some grading factors are necessarily more subjective such as economic and industry factors, regulatory environment and management. C&I and CRE loans are graded Doubtful, Substandard, Special Mention and Pass.

Doubtful- A Doubtful loan has a high probability of total or substantial loss, but because of specific pending events that may strengthen the asset, its classification as a loss is deferred. Doubtful borrowers are usually in default, lack adequate liquidity or capital and lack the resources necessary to remain an operating entity. Pending events can include mergers, acquisitions, liquidations, capital injections, the perfection of liens on additional collateral, the valuation of collateral and refinancing. Generally, pending events should be resolved within a relatively short period and the ratings will be adjusted based on the new information. Nonaccrual treatment is required for Doubtful assets because of the high probability of loss.

Substandard- Substandard loans have a high probability of payment default or they have other well-defined weaknesses. They require more intensive supervision by bank management. Substandard loans are generally characterized by current or expected unprofitable operations, inadequate debt service coverage, inadequate liquidity or marginal capitalization. Repayment may depend on collateral or other credit risk mitigants. For some Substandard loans, the likelihood of full collection of interest and principal may be in doubt and those loans should be placed on nonaccrual. Although Substandard assets in the aggregate will have a distinct potential for loss, an individual asset’s loss potential does not have to be distinct for the asset to be rated Substandard.

Special Mention - Special Mention loans have potential weaknesses that may, if not checked or corrected, weaken the asset or inadequately protect the Company’s position at some future date. These loans pose elevated risk, but their weakness does not yet justify a Substandard classification. Borrowers may be experiencing adverse operating trends (i.e., declining revenues or margins) or may be struggling with an ill-proportioned balance sheet (i.e., increasing inventory without an increase in sales, high leverage and/or tight liquidity). Adverse economic or market conditions, such as interest rate increases or the entry of a new competitor, may also support a Special Mention rating. Although a Special Mention loan has a higher PD than a Pass asset, its default is not imminent.

Pass - Loans graded as Pass encompass all loans not graded as Doubtful, Substandard or Special Mention. Pass loans are in compliance with loan covenants and payments are generally made as agreed. Pass loans range from superior quality to fair quality. Pass loans also include any portion of a government guaranteed loan, including Paycheck Protection Program loans.

Consumer and Residential Grading System

Consumer and Residential loans are graded as either Nonperforming or Performing.

Nonperforming- Nonperforming loans are loans that are (1) over 90 days past due and interest is still accruing or (2) on nonaccrual status.

Performing-All loans not meeting any of the above criteria are considered Performing.

Thefollowing tables illustrate the Company’s credit quality by loan class by vintageand includes gross charge-offs by loan class by vintage. Included in other consumer gross charge-offs for the year ended December 31, 2025, the Company recorded $0.3 million in overdrawn deposit accounts reported as 2024 originations and $0.8 million in overdrawn deposit accounts reported as 2025 originations. Included in other consumer gross charge-offs for the year ended December 31, 2024, the Company recorded $0.2 million in overdrawn deposit accounts reported as 2023 originations and $0.7 million in overdrawn deposit accounts reported as 2024 originations.

The allowance for losses on unfunded commitments totaled $5.8 million as of December 31, 2025, compared to $4.4 million as of December 31,2024. The reserve for unfunded loan commitments was $1.4 million for the year ended December 31, 2025, compared to $(0.7) million for the year ended December 31, 2024 and compared to less than $0.1 million for the year ended December 31, 2023 and was recorded within other noninterest expense in the consolidated statements of income. Included in the reserve for unfunded loan commitments for the year ended December 31, 2025, was $0.5 million of acquisition-related provision for unfunded loan commitments due to the Evans acquisition. Included in the reserve for unfunded loan commitments for the year ended December 31, 2023, was $0.8 million of acquisition-related provision for unfunded loan commitments due to the Salisbury acquisition.

Loan Modifications to Borrowers Experiencing Financial Difficulties

The Company’s January 1, 2023 adoption of ASU 2022-02 eliminates the recognition and measurement of TDRs. Upon adoption of this guidance, the Company no longer recognizes an allowance for credit losses for the economic concession granted to a borrower for changes in the timing and amount of contractual cash flows when a loan is restructured. The adoption of ASU 2022-02 resulted in a change to reporting for loan modifications to borrowers experiencing financial difficulties. With the adoption of ASU 2022-02 these modifications required enhanced reporting on the type of modifications granted and the financial magnitude of the concessions granted.

When the Company modifies a loan with financial difficulty, such modifications generally include one or a combination of the following: an extension of the maturity date; a stated rate of interest lower than the current market rate for new debt with similar risk; a change in scheduled payment amount; or principal forgiveness.

The following table shows the amortized cost basis at the end of the reporting period of the loans modified to borrowers experiencing financial difficulty, disaggregated by class of financing receivable and type of concession granted:

The following table describes the financial effect of the modifications made to borrowers experiencing financial difficulties:

The following table shows the amortized cost basis at the end of the reporting periods of loans modified in the prior twelve months of the reporting periods to borrowers experiencing financial difficulty, disaggregated by class of financing receivable and type of concession granted that had payment defaults during the reporting periods:

The following table depicts the performance of loans that have been modified to borrowers experiencing financial difficulty that were modified in the prior twelve months:

7. Premises, Equipment and Leases

A summary of premises and equipment follows:

Buildings and improvements are depreciated based on useful lives offive totwenty years. Furniture and equipment is depreciated based on useful lives ofthree toten years.

Operating leases in which the Company is the lessee are recorded as operating lease ROU assets and operating lease liabilities, included inother assets andother liabilities, respectively, on the consolidated balance sheets. The Company does not have any significant finance leases in which we are the lessee as of December 31, 2025 and December 31, 2024.

Operating lease ROU assets represent the Company’s right to use an underlying asset during the lease term and operating lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and operating lease liabilities are recognized at lease commencement based on the present value of the remaining lease payments using a discount rate that represents the Company’s incremental borrowing rate at the lease commencement date. ROU assets are further adjusted for lease incentives. Operating lease expense, which is comprised of amortization of the ROU asset and the implicit interest accreted on the operating lease liability, is recognized on a straight-line basis over the lease term and is recorded in occupancy expense in the consolidated statements of income.

The Company made a policy election to exclude the recognition requirements to all classes of leases with original terms of 12 months or less. Instead, the short-term lease payments are recognized in profit or loss on a straight-line basis over the lease term.

The Company has lease agreements with lease and non-lease components, which are generally accounted for separately. For real estate leases, non-lease components and other non-components, such as common area maintenance charges, real estate taxes and insurance are not included in the measurement of the lease liability since they are generally able to be segregated.

Our leases relate primarily to office space and bank branches, and some contain options to renew the lease. These options to renew are generally not considered reasonably certain to exercise, and are therefore not included in the lease term until such time that the option to renew is reasonably certain. As of December 31, 2025, operating lease ROU assets and liabilities were $30.6 million and$33.1 million, respectively. As of December 31, 2024, operating lease ROU assets and liabilities were $27.6 million and $30.3 million, respectively.

The table below summarizes net lease cost:

The table below shows future minimum rental commitments related to non-cancelable operating leases for the next five years and thereafter as of December 31, 2025:

The following table shows the weighted average remaining operating lease term, the weighted average discount rate and supplemental information on the consolidated statements of cash flows for operating leases:

As of December 31, 2025 there are no new significant leases that have not yet commenced.

Rental expense included in occupancy expense amounted to $10.0 million in 2025, $8.4 million in 2024 and $7.9 million in 2023.

8. Goodwill and Other Intangible Assets

A summary of goodwill is as follows:

There wasno impairment of goodwill recorded during the years ended December 31, 2025, 2024 and 2023.

The Company has intangible assets with definite useful lives capitalized on its consolidated balance sheet in the form of core deposit and other identified intangible assets. These intangible assets are amortized over their estimated useful lives, which range primarily fromone totwenty years.

A summary of core deposit and other intangible assets follows:

Amortization expense on intangible assets with definite useful lives totaled $11.9 million for 2025, $8.4 million for 2024 and $4.7 million for 2023. Amortization expense on intangible assets with definite useful lives is expected to total $12.5 million for 2026, $10.8 million for 2027, $9.2 million for 2028, $7.6 million for 2029, $6.1 million for 2030 and $11.5 million thereafter. Other identified intangible assets include customer lists and non-compete agreements.

During the years ended December 31, 2025, 2024 and 2023, there wasno impairment of intangible assets.

9. Deposits

The following table sets forth the maturity distribution of time deposits:

Time deposits of $250,000 or more aggregated $332.9 million and $251.6 million December 31, 2025 and 2024, respectively.

10. Borrowings

Short-Term Borrowings

In addition to the liquidity provided by balance sheet cash flows, liquidity must also be supplemented with additional sources such as credit lines from correspondent banks as well as borrowings from the FHLB and the Federal Reserve Bank. Other funding alternatives may also be appropriate from time to time, including wholesale and retail repurchase agreements and brokered CD accounts.

Short-term borrowings totaled $148.1 million and $162.9 million at December 31, 2025 and 2024, respectively, and consist of Federal funds purchased and securities sold under repurchase agreements, which generally represent overnight borrowing transactions and other short-term borrowings, primarily FHLB advances, with original maturities of one year or less.

The Company has unused lines of credit with the FHLB and access to brokered deposits available for short-term financing. Those sources totaled approximately $4.38 billion and $3.46 billion at December 31, 2025 and 2024, respectively. Borrowings on the FHLB lines are secured by FHLB stock, certain securities and one-to-four family first lien mortgage loans. Securities collateralizing repurchase agreements are held in safekeeping by nonaffiliated financial institutions and are under the Company’s control.

Information related to short-term borrowings is summarized as follows:

See Note 4 for additional information regarding securities pledged as collateral for securities sold under the repurchase agreements.

Long-Term Debt

Long-term debt consists of obligations having an original maturity at issuance of more than one year. A majority of the Company’s long-term debt is comprised of FHLB advances collateralized by the FHLB stock owned by the Company, and a blanket lien on its residential mortgage loans. As of December 31, 2025 the Company had no callable long-term debt. A summary is as follows:

Subordinated Debt

On June 23, 2020, the Company issued $100.0 million aggregate principal amount of 5.00% fixed-to-floating rate subordinated notes due 2030. The subordinated notes, which qualified as Tier 2 capital, bore interest at an annual rate of 5.00%, payable semi-annually in arrears commencing on January 1, 2021, and a floating rate of interest equivalent to thethree-month Secured Overnight Financing Rate (“SOFR”) plus a spread of 4.85%, payable quarterly in arrears commencing on October 1, 2025. The subordinated notes issuance costs of $2.2 million were amortized on a straight-line basis into interest expense over five years.

The subordinated notes were redeemable (1) in whole or in part beginning with the interest payment date of July 1, 2025, and on any interest payment date thereafter or (2) in whole but not in part upon the occurrence of a “Tax Event”, a “Tier 2 Capital Event” or in the event the Company was required to register as an investment company pursuant to the Investment Company Act of 1940, as amended. The redemption price for any redemption was 100% of the principal amount of the subordinated notes being redeemed, plus accrued and unpaid interest thereon to, but excluding, the date of redemption. Any redemption of the subordinated notes was subject to the receipt of the approval of the Board of Governors of the Federal Reserve System to the extent required under applicable laws or regulations, including capital regulations. The Company repurchased $2.0 million of the subordinated notes during the year ended December 31, 2022 at a discount of $0.1 million. On July 1, 2025, the Company redeemed these subordinated notes in full using existing liquidity sources.

The subordinated notes assumed in connection with the Salisbury acquisition included $25.0 million of 3.50% fixed-to-floating rate subordinated notes due 2031. The subordinated notes, which qualified as Tier 2 capital, have a maturity date of March 31, 2031 and bore interest at an annual rate of 3.50%, payable quarterly in arrears commencing on June 30, 2021, and a floating rate of interest equivalent to thethree-month SOFR plus a spread of 2.80%, payable quarterly in arrears commencing on June 30, 2026. The subordinated notes are redeemable, without penalty, on or after March 31, 2026 and, in certain limited circumstances, prior to that date. As of the acquisition date, the fair value discount was $3.0 million.

Subordinated notes assumed in connection with the Evans acquisition included $20.0 million of 6.00% fixed-to-floating rate subordinated notes due 2030. The subordinated notes, which qualified as Tier 2 capital, bore interest at an annual rate of 6.00%, payable semi-annually in arrears commencing on January 15, 2021, and a floating rate of interest equivalent to thethree-month SOFR plus a spread of 5.90%, payable quarterly in arrears commencing on July 15, 2025. On July 15, 2025, the Company redeemed these subordinated notes in full using existing liquidity sources.

The following table summarizes the Company’s subordinated debt:

Junior Subordinated Debt

In connection with the Evans acquisition, the Company acquired Evans Capital Trust I, a statutory business trust wholly-owned by the Company, which issued $11.0 million in aggregate principal amount of floating rate preferred capital securities due November 23, 2034 to various investors and $0.3 million of common securities. As of the acquisition date, the fair value discount was $0.9 million which is being amortized into interest expense over the life of the debt instrument.

The Company sponsorssix business trusts, CNBF Capital Trust I, NBT Statutory Trust I, NBT Statutory Trust II, Alliance Financial Capital Trust I, Alliance Financial Capital Trust II and Evans Capital Trust I (collectively, the “Trusts”). The Company’s junior subordinated debentures include amounts related to the Company’s NBT Statutory Trust I and II as well as junior subordinated debentures associated withone statutory trust affiliate that was acquired from our merger with CNB Financial Corp., two statutory trusts that were acquired from our acquisition of Alliance Financial Corporation (“Alliance”) and one statutory trust that was acquired from our acquisition of Evans. The Trusts were formed for the purpose of issuing company-obligated mandatorily redeemable trust preferred securities to third-party investors and investing in the proceeds from the sale of such preferred securities solely in junior subordinated debt securities of the Company for general corporate purposes. The Company guarantees, on a limited basis, payments of distributions on the trust preferred securities and payments on redemption of the trust preferred securities. The Trusts are VIEs for which the Company is not the primary beneficiary, as defined by GAAP. In accordance with GAAP, the accounts of the Trusts are not included in the Company’s consolidated financial statements. See Note 1 for additional information about the Company’s consolidation policy.

The debentures held by each trust are the sole assets of that trust. The Trusts hold, as their sole assets, junior subordinated debentures of the Company with face amounts totaling $109.0 million at December 31, 2025. The Company owns all of the common securities of the Trusts and has accordingly recorded $3.5 million in equity method investments classified as other assets in our consolidated balance sheets at December 31, 2025. The Company owns all of the common stock of the Trusts, which have issued trust preferred securities in conjunction with the Company issuing trust preferred debentures to the Trusts. The terms of the trust preferred debentures are substantially the same as the terms of the trust preferred securities.

As of December 31, 2025, the Trusts had the following trust preferred securities outstanding and held the following junior subordinated debentures of the Company (dollars in thousands):

The Company’s junior subordinated debentures are redeemable prior to the maturity date at our option upon each trust’s stated option repurchase dates and from time to time thereafter. These debentures are also redeemable in whole at any time upon the occurrence of specific events defined within the trust indenture. Our obligations under the debentures and related documents, taken together, constitute a full and unconditional guarantee by the Company of the issuers’ obligations under the trust preferred securities. The Company owns all of the common stock of the Trusts, which have issued trust preferred securities in conjunction with the Company issuing trust preferred debentures to the Trusts. The terms of the trust preferred debentures are substantially the same as the terms of the trust preferred securities.

With respect to the Trusts, the Company has the right to defer payments of interest on the debentures issued to the Trusts at any time or from time to time for a period of up toten consecutive semi-annual periods with respect to each deferral period. Under the terms of the debentures, if in certain circumstances there is an event of default under the debentures or the Company elects to defer interest on the debentures, the Company may not, with certain exceptions, declare or pay any dividends or distributions on its capital stock or purchase or acquire any of its capital stock.

Despite the fact that the Trusts are not included in the Company’s consolidated financial statements, $108 million of the $112 million in trust preferred securities issued by these subsidiary trusts was included in the Tier 1 capital of the Company for regulatory capital purposes as allowed by the FRB (NBT Bank owns $1.0 million of CNBF Trust I securities) through March 31, 2025. The Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 requires bank holding companies with assets greater than $500 million to be subject to the same capital requirements as insured depository institutions, meaning, for instance, that such bank holding companies will not be able to count trust preferred securities issued after May 19, 2010 as Tier 1 capital. The aforementioned Trusts are grandfathered with respect to this enactment based on their date of issuance. As of June 30, 2025 in connection with the completion of the Evans acquisition and the Company’s assets exceeding $15 billion, the Trusts are now included in the Company’s Tier 2 capital for regulatory capital purposes.

11. Income Taxes

The Company’s income from continuing operations before income tax expense totaled $219.4 million, $179.5 million and $153.5 million for the years ended December 31, 2025, 2024 and 2023, respectively.

The significant components of income tax expense attributable to operations are as follows:

The Company hadno income tax in foreign jurisdictions for the years ended December 31, 2025, 2024 and 2023, respectively.

The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities are as follows:

Realization of deferred tax assets is dependent upon the generation of future taxable income. A valuation allowance is recorded when it is more likely than not that some portion of the deferred tax asset will not be realized. Based on available evidence, gross deferred tax assets will ultimately be realized and a valuation allowance was not deemed necessary at December 31, 2025 and 2024.

The following is a reconciliation of the provision for income taxes which presents our effective tax rate reconciliation for the year ended December 31, 2025, in accordance with the new presentation and disclosure requirements of ASU 2023-09, Improvements to Income Tax Disclosures(“ASU 2023-09”). Consistent with ASC 740-10-50-12A, the table disaggregates both percentages and amounts across the required categories and items meeting the 5% threshold are further disaggregated as required.

(1)State taxes in New York contributed to the majority (greater than 50%) of the tax effect in this category.

The following table presents our reconciliation of the provision for income taxes for the years ended December 31, 2024, and 2023, prepared in accordance with the disclosure requirements applicable prior to the adoption of ASU 2023-09. These amounts are presented under the previous guidance and therefore do not reflect the additional disaggregation required by ASU 2023-09.

The following table presents cash income taxes paid, net of refunds, for the year ended December 31, 2025, disaggregated by category and by individual jurisdictions that are equal to or greater than 5% of total income taxes paid, in accordance with ASU 2023‑09.

A reconciliation of the beginning and ending balance of Federal and State gross unrecognized tax benefits (“UTBs”) is as follows:

The Company recognizes interest and penalties on the income tax expense line in the accompanying consolidated statements of income. As of December 31, 2025, no significant changes to UTBs are projected; however, tax audit examinations are possible, but it is not reasonably possible to estimate when examinations in subsequent years will be completed. The Company recognized $0.8 million and $0.6 million of interest expense related to UTBs in the consolidated statements of income for the years ended December 31, 2025 and 2024, respectively. The tax years 2017 to 2019 are currently being audited by New York State. As of December 31, 2025, the Company is not under federal examination.

12. Employee Benefit Plans

Defined Benefit Post-Retirement Plans

The Company has a qualified, noncontributory, defined benefit pension plan (the “Plan”) covering substantially all of its employees at December 31, 2025. Benefits paid from the Plan are based on age, years of service, compensation and social security benefits and are determined in accordance with defined formulas. The Company’s policy is to fund the Plan in accordance with Employee Retirement Income Security Act of 1974 standards. Assets of the Plan are invested in publicly traded stocks, bonds and mutual funds. Prior to January 1, 2000, the Plan was a traditional defined benefit plan based on final average compensation. On January 1, 2000, the Plan was converted to a cash balance plan with grandfathering provisions for existing participants. Effective March 1, 2013, the Plan was amended. Benefit accruals for participants who, as of January 1, 2000, elected to continue participating in the traditional defined benefit plan design were frozen as of March 1, 2013. In addition to the Plan, the Company provides supplemental employee retirement plans to certain current and former executives. These supplemental employee retirement plans and the Plan are collectively referred to herein as “Pension Benefits.”

In connection with the Evans acquisition, the Company assumed the non-contributory, qualified, defined benefit pension plan and the nonqualified supplemental executive retirement plans. Effective May 2, 2025, the Evans defined benefit pension plan was merged into the Plan. The merging of the plans required a valuation as of the merger date and resulted in a $0.9 million adjustment to AOCI. The merging of the plans did not have a significant impact on the Company’s financial statements and related footnotes.

In addition, the Company provides certain health care benefits for retired employees. Benefits were accrued over the employees’ active service period. Only employees that were employed by the Company on or before January 1, 2000 are eligible to receive post-retirement health care benefits. The Plan is contributory for participating retirees, requiring participants to absorb certain deductibles and coinsurance amounts with contributions adjusted annually to reflect cost sharing provisions and benefit limitations called for in the Plan. Employees become eligible for these benefits if they reach normal retirement age while working for the Company. For eligible employees described above, the Company funds the cost of post-retirement health care as benefits are paid. The Company elected to recognize the transition obligation on a delayed basis over twenty years. These post-retirement benefits are referred to herein as “Other Benefits.”

Accounting standards require an employer to: (1) recognize the overfunded or underfunded status of defined benefit post-retirement plans, which is measured as the difference between plan assets at fair value and the benefit obligation, as an asset or liability in its balance sheet; (2) recognize changes in that funded status in the year in which the changes occur through comprehensive income; and (3) measure the defined benefit plan assets and obligations as of the date of its year-end balance sheet.

The components of AOCI, which have not yet been recognized as components of net periodic benefit cost, related to pensions and other post-retirement benefits are summarized below:

A December 31 measurement date is used for the pension, supplemental pension and post-retirement benefit plans. The following table sets forth changes in benefit obligations, changes in plan assets and the funded status of the pension plans and other post-retirement benefits:

An asset is recognized for an overfunded plan and a liability is recognized for an underfunded plan. The accumulated benefit obligation for pension benefits was $80.4 million and $75.0 million at December 31, 2025 and 2024, respectively. The accumulated benefit obligation for other post-retirement benefits was $4.7 million and $4.5 million at December 31, 2025 and 2024, respectively. The funded status of the pension and other post-retirement benefit plans has been recognized as follows in the consolidated balance sheets at December 31, 2025 and 2024.

The following assumptions were used to determine the benefit obligation and the net periodic pension cost for the years indicated:

Net periodic benefit cost and other amounts recognized in OCI for the years ended December 31 included the following components:

The service cost component of the net periodic cost (benefit) is included in salaries and employee benefits and the interest cost, expected return on plan assets and net amortization components are included in other noninterest expense on the consolidated statements of income.

The following table sets forth estimated future benefit payments for the pension plans and other post-retirement benefit plans as of December 31, 2025:

The Company madeno voluntary contributions to the pension and other benefit plans during the years ended December 31, 2025 and 2024.

For measurement purposes, the annual rates of increase in the per capita cost of covered medical and prescription drug benefits for fiscal year 2025 were assumed to be 6.5% to 11.25%. The rates were assumed to decrease gradually to 4.5% for fiscal year 2034 and remain at that level thereafter. Assumed health care cost trend rates have a significant effect on amounts reported for health care plans.

Plan Investment Policy

The Company’s key investment objectives in managing its defined benefit plan assets are to ensure that present and future benefit obligations to all participants and beneficiaries are met as they become due; to provide a total return that, over the long-term, maximizes the ratio of the plan assets to liabilities, while minimizing the present value of required Company contributions, at the appropriate levels of risk; to meet statutory requirements and regulatory agencies’ requirements; and to satisfy applicable accounting standards. The Company periodically evaluates the asset allocations, funded status, rate of return assumption and contribution strategy for satisfaction of our investment objectives.

The target and actual allocations expressed as a percentage of the defined benefit pension plan’s assets are as follows:

Only high-quality bonds are to be included in the portfolio. All issues that are rated lower than A by Standard and Poor’s are to be excluded. Equity securities at December 31, 2025 and 2024 do not include any Company common stock.

The following table presents the financial instruments recorded at fair value on a recurring basis by the Plan:

The plan had no financial instruments recorded at fair value on a non-recurring basis as of December 31, 2025 and 2024.

Determination of Assumed Rate of Return

The expected long-term rate-of-return on assets was 6.7% at December 31, 2025 and 2024, respectively. This assumption represents the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the projected benefit obligation. The assumption has been determined by reflecting expectations regarding future rates of return for the portfolio considering the asset distribution and related historical rates of return. The appropriateness of the assumption is reviewed annually.

Employee 401(k) and Employee Stock Ownership Plans

The Company maintains a 401(k) and employee stock ownership plan (the “401(k) Plan”). The Company contributes to the 401(k) Plan based on employees’ contributions out of their annual salaries. In addition, the Company may also make discretionary contributions to the 401(k) Plan based on profitability. Participation in the 401(k) Plan is contingent upon certain age and service requirements. The employer contributions associated with the 401(k) Plan were $5.4 million in 2025, $4.9 million in 2024 and $4.4 million in 2023.

Other Retirement Benefits

Included in other liabilities is $0.8 million and $0.6 million at December 31, 2025 and 2024, respectively, for supplemental retirement benefits for retired executives from legacy plans assumed in acquisitions. The Company recognized less than $0.1 million in 2025, $0.1 million in 2024 and $0.2 million in 2023, related to these plans.

13. Stock-Based Compensation

In May 2024, the Company adopted the NBT Bancorp Inc. 2024 Omnibus Incentive Plan (the “Stock Plan”) replacing the 2018 Omnibus Incentive Plan. Under the terms of the Stock Plan, equity-based awards are granted to directors and employees to increase their direct proprietary interest in the operations and success of the Company. The Stock Plan assumed all prior equity-based incentive plans and any new equity-based awards are granted under the terms of the Stock Plan. Restricted shares granted under the Plan typically vest after three orfive years for employees andone year for non-employee directors. Restricted stock units granted under the Stock Plan may have different terms and conditions. Performance shares and units granted under the Stock Plan for executives may have different terms and conditions. Since 2011, the Company primarily grants restricted stock unit awards. Stock option grants since that time were reloads of existing grants which terminateten years from the date of thegrant. Under terms of the Stock Plan, stock options are granted to purchase shares of the Company’s common stock at a price equal to the fair market value of the common stock on the date of the grant. Shares issued as a result of vesting of restricted stock unit awards and stock option exercises are funded from the Company’s treasury stock.

The Company has outstanding restricted stock granted from various plans at December 31, 2025. The Company recognized $5.3 million, $6.0 million and $5.1 million in stock-based compensation expense related to these stock awards for the years ended December 31, 2025, 2024 and 2023, respectively. Tax benefits recognized with respect to restricted stock units were $2.7 million, $1.5 million and $1.3 million for the years ended December 31, 2025, 2024 and 2023, respectively. Unrecognized compensation cost related to restricted stock units totaled $5.5 million at December 31, 2025 and will be recognized over 1.5 years on a weighted average basis. Shares issued are funded from the Company’s treasury stock. The following table summarizes information for unvested restricted stock units outstanding as of December 31, 2025:

As of December 31, 2024, there were 3,850 options outstanding with a weighted average exercise price of $30.36 which were fully exercised during 2025. There wereno options outstanding at December 31, 2025. There wasno stock-based compensation expense for stock option awards for the years ended December 31, 2025, 2024 and 2023.

Cash proceeds, tax benefits and intrinsic value related to total stock options exercised is as follows:

The Company has 493,424 securities remaining available to be granted as part of the Plan at December 31, 2025.

14. Stockholders’ Equity

In accordance with GAAP, unrecognized prior service costs and net actuarial gains or losses associated with the Company’s pension and postretirement benefit plans and unrealized gains and losses on AFS securities are included in AOCI, net of tax. For the years ended December 31, components of AOCI are:

Certain restrictions exist regarding the ability of the Bank to transfer funds to the Company in the form of cash dividends. The approval of the OCC is required to pay dividends when a bank fails to meet certain minimum regulatory capital standards or when such dividends are in excess of a subsidiary bank’s earnings retained in the current year plus retained net profits for the precedingtwo years as specified in applicable OCC regulations. At December 31, 2025, approximately $115.9 million of the total stockholders’ equity of the Bank was available for payment of dividends to the Company without approval by the OCC. The Bank’s ability to pay dividends also is subject to the Bank being in compliance with regulatory capital requirements. The Bank is currently in compliance with these requirements. Under the State of Delaware General Corporation Law, the Company may declare and pay dividends either out of accumulated net retained earnings or capital surplus.

On October 27, 2025, the Company’s Board of Directors (“Board”) authorized and approved an amendment to the Company’s stock repurchase program. Pursuant to the amended stock repurchase program, the Company may repurchase up to 2,000,000 shares of the Company’s common stock with all repurchases under the stock repurchase program to be made by December 31, 2027. The Company may repurchase shares of its common stock from time to time to mitigate the potential dilutive effects of stock-based incentive plans and other potential uses of common stock for corporate purposes.

The Company purchased 250,000 shares of its common stock during the year ended December 31, 2025, for a total of $10.2 million at an average price of $40.74 per share under its previously announced stock repurchase program. As of December 31, 2025, there were 1,750,000 shares available for repurchase under this plan authorized on October 27, 2025 which is set to expire on December 31, 2027.

15. Regulatory Capital Requirements

The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the consolidated financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Bank must meet specific capital guidelines that involve quantitative measures of NBT Bank’s assets, liabilities and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and classifications are also subject to qualitative judgments by the regulators about components, risk weightings and other factors.

Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios (set forth in the table below) of total and Tier 1 Capital to risk-weighted assets and of Tier 1 capital to average assets. In addition to maintaining minimum capital ratios, the Company is subject to a capital conservation buffer (“Buffer”) of 2.50% above the minimum to avoid restriction on capital distributions and discretionary bonus paychecks to officers. At December 31, 2025 and 2024, the Company and the Bank meet all capital adequacy requirements to which they were subject.

Under their prompt corrective action regulations, regulatory authorities are required to take certain supervisory actions (and may take additional discretionary actions) with respect to an undercapitalized institution. Such actions could have a direct material effect on an institution’s financial statements. The regulations establish a framework for the classification of banks into five categories: well-capitalized, adequately capitalized, undercapitalized, significantly undercapitalized and critically undercapitalized. As of December 31, 2025 and 2024, the most recent notifications from the Bank’s regulators categorized the Bank as well-capitalized under the regulatory framework for prompt corrective action. To be categorized as well-capitalized the Bank must maintain minimum total risk-based, Tier 1 risk-based and Tier 1 Capital to Average Asset ratios as set forth in the table below. There are no conditions or events since that notification that management believes have changed the Bank’s category.

The Company and NBT Bank’s actual capital amounts and ratios are presented as follows:

16. Earnings Per Share

The following is a reconciliation of basic and diluted EPS for the years presented in the consolidated statements of income:

There was a nominal number of weighted average stock options outstanding for the year ended December 31, 2023, that were not considered in the calculation of diluted EPS since the stock options’ exercise prices were greater than the average market price during these periods.

17. Reclassification Adjustments Out of Other Comprehensive Income (Loss)

The following table summarizes the reclassification adjustments out of AOCI:

18. Commitments and Contingent Liabilities

The Company’s concentrations of credit risk are reflected in the consolidated balance sheets. The concentrations of credit risk with standby letters of credit, unused lines of credit, commitments to originate new loans and loans sold with recourse generally follow the loan classifications.

At December 31, 2025, approximately 67% of the Company’s loans were secured by real estate located in upstate New York, northeastern Pennsylvania, southern New Hampshire, western Massachusetts, Vermont, southern Maine and central and northwestern Connecticut. Accordingly, the ultimate collectability of a substantial portion of the Company’s portfolio is susceptible to changes in market conditions of those areas. Management is not aware of any material concentrations of credit to any industry or individual borrowers.

The Company is a party to certain financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit, unused lines of credit, standby letters of credit and certain agricultural real estate loans sold to investors with recourse, with the sold portion having a government guarantee that is assignable back to the Company upon repurchase of the loan in the event of default. The Company’s exposure to credit loss in the event of nonperformance by the other party to the commitments to extend credit, unused lines of credit, standby letters of credit and loans sold with recourse is represented by the contractual amount of those instruments. The credit risk associated with commitments to extend credit and standby and commercial letters of credit is essentially the same as that involved with extending loans to customers and is subject to normal credit policies. Collateral may be obtained based on management’s assessment of the customer’s creditworthiness.

Since many loan commitments, standby letters of credit and guarantees and indemnification contracts expire without being funded in whole or in part, the contract amounts are not necessarily indicative of future cash flows. The Company does not issue any guarantees that would require liability-recognition or disclosure, other than its standby letters of credit.

The Company guarantees the obligations or performance of customers by issuing standby letters of credit to third-parties. These standby letters of credit are generally issued in support of third-party debt, such as corporate debt issuances, industrial revenue bonds and municipal securities. The risk involved in issuing standby letters of credit is essentially the same as the credit risk involved in extending loan facilities to customers and letters of credit are subject to the same credit origination, portfolio maintenance and management procedures in effect to monitor other credit and off-balance sheet products. Typically, these instruments haveone year expirations with an option to renew upon annual review; therefore, the total amounts do not necessarily represent future cash requirements. As of December 31, 2025 and 2024, the fair value of the Company’s standby letters of credit was not significant.

In the normal course of business there are various outstanding legal proceedings. The Company accrues for material estimated losses from loss contingencies if the information available indicates that it is probable that a liability had been incurred at the date of the financial statements and the amount of loss can be reasonably estimated.

19. Derivative Instruments and Hedging Activities

The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate risk, primarily by managing the amount, sources and duration of its assets and liabilities and through the use of derivative instruments. Specifically, the Company may enter into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which is determined by interest rates. Generally, the Company may use derivative financial instruments to manage differences in the amount, timing and duration of the Company’s known or expected cash receipts and its known or expected cash payments. Currently, the Company has interest rate derivatives resulting from a service provided to certain qualifying customers and, therefore, are not used to manage interest rate risk in the Company’s assets or liabilities. The Company manages a matched book with respect to its derivative instruments in order to minimize its net risk exposure resulting from such transactions.

Derivatives Not Designated as Hedging Instruments

The Company enters into interest rate swaps to facilitate customer transactions and meet their financing needs. These swaps are considered derivatives, but are not designated as hedging relationships. These instruments have interest rate and credit risk associated with them. To mitigate the interest rate risk, the Company enters into offsetting interest rate swaps with counterparties. The counterparty swaps are also considered derivatives and are also not designated as hedging relationships. Interest rate swaps are recorded within other assets or other liabilities on the consolidated balance sheets at their estimated fair value. Changes to the fair value of assets and liabilities arising from these derivatives are included, net, in other operating income in the consolidated statements of income.

The Company is subject to over-the-counter derivative clearing requirements, which require certain derivatives to be cleared through central clearing houses. Accordingly, the Company clears certain derivative transactions through the Chicago Mercantile Exchange Clearing House (“CME”). The CME requires the Company to post initial and variation margin payments to mitigate the risk of non-payment, the latter of which is received or paid daily based on the net asset or liability position of the contracts. A daily settlement occurs through the CME for changes in the fair value of centrally cleared derivatives. Not all of the derivatives are required to be cleared through the daily clearing agent. As a result, the total fair values of loan level derivative assets and liabilities recognized on the Company’s financial statements are not equal and offsetting.

As of December 31, 2025 and 2024, the Company hadtwenty-two andtwenty risk participation agreements, respectively, with financial institution counterparties for interest rate swaps related to participated loans. Risk participation agreements provide credit protection to the financial institution that originated the swap transaction should the borrower fail to perform on its obligation. The Company enters into both risk participation agreements in which it purchases credit protection from other financial institutions and those in which it provides credit protection to other financial institutions.

The following table summarizes the derivatives outstanding:

The following table indicates the gain or loss recognized in income on derivatives not designated as a hedging relationship:

20. Fair Value Measurements and Fair Values of Financial Instruments

GAAP states that fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Fair value measurements are not adjusted for transaction costs. A fair value hierarchy exists within GAAP that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below:

Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities;

Level 2 - Quoted prices for similar assets or liabilities in active markets, quoted prices in markets that are not active or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability; and

Level 3 - Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity).

A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement.

The types of instruments valued based on quoted market prices in active markets include most U.S. government and agency securities, many other sovereign government obligations, liquid mortgage products, active listed equities and most money market securities. Such instruments are generally classified within Level 1 or Level 2 of the fair value hierarchy. The Company does not adjust the quoted prices for such instruments.

The types of instruments valued based on quoted prices in markets that are not active, broker or dealer quotations or quotes from alternative pricing sources with reasonable levels of price transparency include most investment-grade and high-yield corporate bonds, less liquid mortgage products, less liquid agency securities, less liquid listed equities, state, municipal and provincial obligations and certain physical commodities. Such instruments are generally classified within Level 2 of the fair value hierarchy. Certain common equity securities are reported at fair value utilizing Level 1 inputs (exchange quoted prices). Other investment securities are reported at fair value utilizing Level 1 and Level 2 inputs. The prices for Level 2 instruments are obtained through an independent pricing service or dealer market participants with whom the Company has historically transacted both purchases and sales of investment securities. Prices obtained from these sources include prices derived from market quotations and matrix pricing. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things. Management reviews the methodologies used by its third-party providers in pricing the securities.

Level 3 is for positions that are not traded in active markets or are subject to transfer restrictions. Valuations are adjusted to reflect illiquidity and/or non-transferability and such adjustments are generally based on available market evidence. In the absence of such evidence, management’s best estimate will be used. Management’s best estimate consists of both internal and external support on certain Level 3 investments. Subsequent to inception, management only changes Level 3 inputs and assumptions when corroborated by evidence such as transactions in similar instruments, completed or pending third-party transactions in the underlying investment or comparable entities, subsequent rounds of financing, recapitalizations and other transactions across the capital structure, offerings in the equity or debt markets and changes in financial ratios or cash flows.

The following tables set forth the Company’s financial assets and liabilities measured on a recurring basis that were accounted for at fair value. Assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement:

GAAP requires disclosure of assets and liabilities measured and recorded at fair value on a non-recurring basis such as goodwill, loans held for sale, OREO, collateral-dependent loans individually evaluated for expected credit losses and HTM securities. Loans with fair value of $12.2 million as of December 31, 2025 were individually evaluated for expected credit losses where the amortized cost was adjusted to fair value. Loans with fair value of $28.8 million as of December 31, 2024 were individually evaluated for expected credit losses where the amortized cost was adjusted to fair value.The Company uses the fair value of underlying collateral, less costs to sell, to estimate the allowance for credit losses for individually evaluated collateral dependent loans. The appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses ranging from 10% to 50%. Based on the valuation techniques used, the fair value measurements for collateral dependent individually evaluated loans are classified as Level 3.

The following table sets forth information with regard to estimated fair values of financial instruments. This table excludes financial instruments for which the carrying amount approximates fair value. Financial instruments for which the fair value approximates carrying value include cash and cash equivalents, AFS securities, equity securities, AIR, non-maturity deposits, short-term borrowings, accrued interest payable and derivatives.

Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because no market exists for a significant portion of the Company’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in assumptions could significantly affect the estimates.

Fair value estimates are based on existing on and off-balance sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. For example, the Company has a substantial wealth operation that contributes net fee income annually. The wealth management operation is not considered a financial instrument and its value has not been incorporated into the fair value estimates. Other significant assets and liabilities include the benefits resulting from the low-cost funding of deposit liabilities as compared to the cost of borrowing funds in the market and premises and equipment. In addition, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in the estimate of fair value.

HTM Securities - The fair value of the Company’s HTM securities is primarily measured using information from a third-party pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things.

Net Loans - Net loans include portfolio loans and loans held for sale. Loans were first segregated by type and then further segmented into fixed and variable rate and loan quality categories. Expected future cash flows were projected based on contractual cash flows, adjusted for estimated prepayments, and those expected future cash flows also includes credit risk, illiquidity risk and other market factors to calculate the exit price fair value in accordance with ASC 820.

Time Deposits - The fair value of time deposits was estimated using a discounted cash flow approach that applies prevailing market interest rates for similar maturity instruments. The fair values of the Company’s time deposit liabilities do not take into consideration the value of the Company’s long-term relationships with depositors, which may have significant value.

Long-Term Debt -The fair value of long-term debt was estimated using a discounted cash flow approach that applies prevailing market interest rates for similar maturity instruments.

Subordinated Debt- The fair value of subordinated debt has been measured using the observable market price as of the period reported.

Junior Subordinated Debt- The fair value of junior subordinated debt has been estimated using a discounted cash flow analysis.

21. Parent Company Financial Information

Condensed Balance Sheets

Condensed Statements of Income

Condensed Statements of Cash Flows

A statement of changes in stockholders’ equity has not been presented since it is the same as the consolidated statement of changes in stockholders’ equity previously presented.

22. Segment Reporting

In accordance with ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, management assesses its operating segment structure to enhance transparency in how financial performance is evaluated and resources are allocated by the CODM. Segments are components of an enterprise that are regularly evaluated by the CODM to allocate resources and assess performance. The Company’s CODM is its Chief Executive Officer.

The Company has determined that it operates throughtwo reportable segments:

Banking– Provides commercial banking, retail banking, and wealth management services primarily to customers in its market area, offering a broad array of banking and financial services to retail, commercial, and municipal customers. Included in Banking are the revenue and expenses from the wealth management business and the parent holding company. The parent company’s principal activities include the direct and indirect ownership of banking and non-banking subsidiaries, as well as the issuance of debt and equity. The parent company’s principal sources of revenue are the management fees and dividends it receives from its subsidiaries. Banking also includes corporate shared service costs such as the majority of equity compensation expense, as well as other general and administrative shared services costs including pension, retirement plan and supplemental retirement plan costs. Currently there is no allocation of these costs to other operating segments.

Retirement Plan Administration – Includes retirement plan and health savings account recordkeeping and administration, investment management, third-party administration, and actuarial services.

Our CODM reviews actual net income versus budgeted net income to assess segment performance and to make decisions about allocating capital and personnel to the segments. The CODM regularly receives expense information at a level consistent with that disclosed in the Company’s consolidated statements of income.

Reported segments and their financial information are not necessarily comparable to similar information reported by other financial institutions. Additionally, due to interrelationships among the various segments, the information presented is not indicative of how the segments would perform as independent entities. Changes in management structure, allocation methodologies, or procedures may result in future revisions to previously reported segment financial data. The Company will continue to evaluate its segment disclosures in accordance with ASU 2023-07 and make necessary adjustments as business operations evolve.

Information about reportable segments and reconciliation of the information to the consolidated financial statements follows: