MID PENN BANCORP INC

Note 1 -Summary of Significant Accounting Policies

Nature of Operations

Mid Penn Bancorp, Inc. ("Mid Penn" or the "Corporation"), through operations conducted by Mid Penn Bank (the "Bank") and its nonbank subsidiaries, engages in a full-service commercial banking and trust business, making available to the community a wide range of financial services, including, but not limited to, mortgage and home equity loans, secured and unsecured commercial and consumer loans, lines of credit, construction financing, farm loans, community development loans, loans to non-profit entities, local government loans, and various types of time and demand deposits including but not limited to, checking accounts, savings accounts, clubs, money market deposit accounts, certificates of deposit, and Individual Retirement Accounts ("IRA"). In addition, the Bank provides a full range of trust and wealth management services through its Trust Department. Deposits are insured by the Federal Deposit Insurance Corporation ("FDIC") to the extent provided by law.

Mid Penn also fulfills the insurance and financial advisory needs of both existing and potential customers through MPB Risk Services, LLC, doing business as MPB Insurance and Risk Management, and Cumberland Advisors, LLC, respectively.

The financial services are provided to individuals, partnerships, non-profit organizations, and corporations through its retail banking offices located throughout Pennsylvania, with a minor portion in New Jersey.

Basis of Presentation

For all periods presented, the accompanying Consolidated Financial Statements include the accounts of Mid Penn Bancorp, Inc., its wholly-owned subsidiary, Mid Penn Bank, andfive wholly-owned nonbank subsidiaries, MPB Realty Holding, LLC, MPB Financial Services, LLC, which includes Cumberland Advisors, LLC and MPB Risk Services, LLC, and MPB Launchpad Fund I, LLC. Mid Penn has onlyone reportable segment for financial reporting purposes. All intercompany accounts and transactions have been eliminated in consolidation.

Certain information and disclosures normally included in consolidated financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to the rules and regulations of the SEC. Mid Penn believes the information presented is not misleading, and the disclosures are adequate. In the opinion of management, all adjustments necessary for fair presentation of the periods presented have been reflected in the accompanying consolidated financial statements. All such adjustments are of a normal, recurring nature. These unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the 2025 Annual Report.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could materially differ from those estimates.

Material estimates subject to significant change include the allowance for credit losses, expected cash flows on acquired loans, business combination fair value computations, and the valuation of goodwill and other intangible assets.

Recent Accounting Pronouncements

Accounting Standards Adopted in 2026

Effective January 1, 2026, the Corporation adopted ASU 2025-08, Financial Instruments - Credit Losses (Topic 326): Purchased Loans. The impact of adoption is reflected in the ACL rollforward in "Note 4 - Loans and Allowance for Credit Losses". The adoption did not result in a cumulative-effect adjustment to beginning retained earnings.

Accounting Standards Pending Adoption

ASU 2024-03: The FASB issued ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses

The amendments in the ASU improve financial reporting by requiring that public business entities disclose additional information about specific expense categories in the notes to financial statements at interim and annual reporting periods. The amendments are effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted. ASU 2024-03 is not expected to have a significant impact on the Corporation's financial statements.

ASU 2025-01 - The FASB issued ASU 2025-01, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Clarifying the Effective Date

The amendments in the ASU clarify the effective date of ASU 2024-03 which requires public business entities to disclose additional information about specific expense categories in the notes to financial statements at interim and annual reporting periods. The amendments in the ASU are effective for the first annual reporting period beginning after December 15, 2026, and interim reporting periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. ASU 2025-01 is not expected to have a significant impact on the Corporation's financial statements.

ASU 2025-09 -The FASB issued ASU 2025-09, Derivatives and Hedging (Topic 815): Hedge Accounting Improvements

The amendments in this ASU refine hedge accounting guidance to better align accounting with risk management strategies. The amendments are effective for fiscal years beginning after December 15, 2026, including interim periods therein. Early adoption is permitted. ASU 2025-09 is not expected to have a significant impact on the Corporation's financial statements.

Management does not expect the adoption of any other recently issued accounting standards to have a material impact on the Corporation's consolidated financial statements.

Note 2 -Business Combinations

Cumberland Advisors, Inc. Acquisition

On January 1, 2026, Mid Penn completed its acquisition of Cumberland Advisors, Inc., a registered investment advisory firm, for total consideration of $5.5 million. As a result of the acquisition, Mid Penn paid holders of Cumberland Advisors, Inc. common stock $1.6 million in cash and issued 127,009 shares of Mid Penn common stock.

In connection with the acquisition, Cumberland Advisors, Inc. was merged into a newly formed Mid Penn acquisition subsidiary and now operates as Cumberland Advisors, LLC. As of September 30, 2026, Cumberland Advisors, LLC had approximately $2.6 billion in assets under management.

Mid Penn recognized goodwill of $5.1 million, and a customer list intangible of $2.1 million as a result of the acquisition.

Mid Penn incurred merger-related expenses related to the Cumberland Advisors Acquisition of $622 thousand for the nine months ended September 30, 2026, which are included in noninterest expense in the Consolidated Statements of Income. There wereno merger-related expenses related to the Cumberland Advisors Acquisition during the three months ended September 30, 2026.

1st Colonial Bancorp, Inc. Acquisition

On February 27, 2026, Mid Penn completed its acquisition of 1st Colonial Bancorp, Inc., through the merger of 1st Colonial with and into Mid Penn. The acquisition was accounted for as a business combination in accordance with ASC 805, Business Combinations.

In connection with the merger, Mid Penn issued 2,111,076 shares of Mid Penn common stock and paid holders of 1st Colonial common stock approximately $37.5 million in cash. Each share of Mid Penn common stock outstanding prior to the merger remained outstanding and unaffected by the merger.

Mid Penn recognized goodwill of $15.3 million, and a core deposit intangible asset of $17.3 million as a result of this acquisition. This is calculated as the excess of consideration exchanged and liabilities assumed compared to the fair value of identifiable assets acquired. Goodwill is primarily comprised of expected synergies, the assembled workforce, and expanded market presence. Goodwill is not deductible for income tax purposes.

Mid Penn incurred merger-related expenses related to 1st Colonial acquisition of $43 thousand and $7.2 million for the three and nine months ended September 30, 2026, respectively, which are included in noninterest expense in the Consolidated Statements of Income.

Purchased loans and leases that reflect a more-than-insignificant deterioration of credit from origination are considered PCD. Mid Penn considers various factors in connection with the identification of more-than-insignificant deterioration in credit, including but not limited to nonperforming status, delinquency, risk ratings, FICO scores and other qualitative factors that indicate deterioration in credit quality since origination. For PCD loans and leases, the initial estimate of expected credit losses is recognized in the ACL on the date of acquisition using the same methodology as other loans and leases held-for-investment.

As part of the 1st Colonial acquisition, Mid Penn acquired PSL and PCD loans of $599.4 million and $7.4 million, respectively. The day 1 allowance recorded at acquisition was $4.4 million, including $977 thousand related to PCD loans. The related fair value adjustment reflected both expected credit losses recognized at acquisition and other loan valuation factors, including interest rate risk and liquidity considerations.

The following table summarizes the preliminary fair values of the assets acquired and liabilities assumed as of the acquisition date:

The fair values of assets acquired and liabilities assumed are based on preliminary estimates and, as permitted under GAAP, Mid Penn has up to twelve months following the date of the merger to finalize the fair values of the acquired assets and assumed liabilities related to the merger. During this measurement period, Mid Penn may record subsequent adjustments to goodwill for provisional amounts recorded at the merger date, with provisional merger-related tax adjustments.

1st Colonial contributed approximately $4.0 million of total revenue and $2.6 million of net income to Mid Penn's consolidated results for the three months ended September 30, 2026. For the nine months ended September 30, 2026, 1st Colonial contributed approximately $8.9 million of total revenue and $6.3 million of net income to Mid Penn's consolidated results.

The following supplemental pro forma information presents certain financial results for the three and nine months ended September 30, 2026 and 2025 as if the merger of 1st Colonial was effective as of January 1, 2025. The supplemental unaudited pro forma financial information included in the table below is based on various estimates and is presented for informational purposes only and does not indicate the results of operations of the combined company that would have been achieved for the periods presented had the transaction been completed as of the date indicated or that may be achieved in the future.

William Penn Acquisition

On April 30, 2025, Mid Penn completed its acquisition of 100% of the outstanding shares of William Penn through the merger of William Penn with and into Mid Penn.

This transaction included the acquisition of 12 branches, further expanding Mid Penn's presence in the Philadelphia region and surrounding counties in Pennsylvania and New Jersey.

Mid Penn recognized total goodwill of $6.9 million, and a core deposit intangible asset of $9.0 million as a result of this acquisition. This is calculated as the excess of consideration exchanged and liabilities assumed compared to the fair value of identifiable assets acquired. Goodwill is primarily comprised of expected synergies and an assembled workforce. Goodwill is not deductible for income tax purposes.

The purchase accounting for the transaction was finalized as of December 31, 2025, and no adjustments were recorded during the nine months ended September 30, 2026.

Charis Insurance Group, Inc. Acquisition

On May 12, 2025, Mid Penn acquired the insurance business and related accounts of Charis Insurance Group, Inc. (Charis Insurance Group), which provides business, home and auto insurance throughout central and southern Pennsylvania, for a cash purchase price of $4.0 million.

Mid Penn recognized total goodwill of $1.6 million, which is calculated as the excess of consideration exchanged and liabilities assumed compared to the fair value of identifiable assets acquired.

Note 3 -Investment Securities

AFS Securities

As of September 30, 2026, the fair value of AFS securities totaled $470.8 million. As of September 30, 2026, no securities were identified that violated credit loss triggers; therefore, no discounted cash flow analysis was required. As of September 30, 2026, the Corporation recorded no allowance for credit losses on any available-for-sale debt securities.

Accrued interest receivable is excluded from the estimate of credit losses for AFS securities. As of September 30, 2026, accrued interest receivable totaled $2.5 million for AFS securities, and was reported inaccrued interest receivable on the accompanying Consolidated Balance Sheet.

HTM Securities

As of September 30, 2026, Mid Penn’s HTM securities totaled $365.7 million. The Corporation primarily held highly rated HTM securities, including taxable and tax-exempt securities issued mainly by the U.S government, state governments, and political subdivisions. As of September 30, 2026, the majority of Mid Penn's HTM securities were rated investment grade, generally A1/BBB by Moody's and/or Standard & Poor's ratings services. Credit ratings of HTM securities, which are a key factor in estimating expected credit losses, are reviewed on a quarterly basis. Management has the intent and ability to hold these securities to maturity.

As of September 30, 2026, there were no HTM securities that were past due 30 days or more as to principal or interest payments. Additionally, Mid Penn had no HTM securities classified as nonaccrual as of September 30, 2026. As of September 30, 2026, the Corporation recorded no allowance for credit losses on any held-to-maturity debt securities.

Accrued interest receivable is excluded from the estimate of credit losses for HTM securities. As of September 30, 2026, accrued interest receivable totaled $2.5 million for HTM securities and was reported inaccrued interest receivable on the accompanying Consolidated Balance Sheet.

The following tables set forth the amortized cost and estimated fair value of investment securities for the periods presented:

Estimated fair values of debt securities are based on quoted market prices, where applicable. If quoted market prices are not available, fair values are based on quoted market prices of instruments of a similar type, credit quality and structure, adjusted for differences between the quoted instruments and the instruments being valued. See "Note 8 - Fair Value Measurement," for additional information.

Investment securities having a fair value of $659.3 million as of September 30, 2026 and $544.7 million as of December 31, 2025 were pledged primarily to secure public deposits, some Trust department deposit accounts, and certain other borrowings. In accordance with legal provisions for alternatives other than pledging of investments, Mid Penn also obtains letters of credit from the FHLB to secure certain public deposits. These FHLB letter of credit commitments totaled $454.1 million as of September 30, 2026 and $162.5 million as of December 31, 2025.

The following tables present gross unrealized losses and fair value of debt investment securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position for the periods presented:

As of September 30, 2026 and December 31, 2025, the majority of the unrealized losses on securities in an unrealized loss position were attributable to U.S. Treasury and U.S. government agencies, and mortgage-backed U.S. government agencies.

The Corporation evaluates debt securities for credit losses in accordance with ASC 326. Mid Penn had no securities considered by management to be credit related losses as of September 30, 2026 and December 31, 2025, and did not record any securities losses in the respective periods ended on these dates. Mid Penn does not consider the securities with unrealized losses on the respective dates to be credit related losses as the unrealized losses were deemed to be temporary changes in value related to market movements in interest yields at various periods similar to the maturity dates of holdings in the investment portfolio, and not reflective of an erosion of credit quality.

There wereno gross realized gains or losses on the sale of AFS securities as of September 30, 2026 and December 31, 2025, respectively.

The table below illustrates the contractual maturity of debt investment securities at amortized cost and estimated fair value. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay with or without call or prepayment penalties.

Note 4 -Loans and Allowance for Credit Losses - Loans

Loans, net of unearned income, are summarized as follows by portfolio segment:

Total loans are stated at the amount of unpaid principal, adjusted for net deferred fees and costs. Net deferred loan fees were $3.6 million and $2.8 million as of September 30, 2026 and December 31, 2025, respectively.

Accrued interest receivable is not included in the amortized cost basis of Mid Penn's loans. Accrued interest receivable for loans totaled $29.1 million and $25.7 million as of September 30, 2026 and December 31, 2025, respectively, with no related ACL and was reported inother assets on the accompanying Consolidated Balance Sheet.

Past Due and Nonaccrual Loans

The performance and credit quality of the loan portfolio is also monitored by analyzing the age of the loans receivable as determined by the length of time a recorded payment is past due. The classes of the loan portfolio summarized by the past due status as of September 30, 2026 and December 31, 2025, are summarized as follows:

Loans are placed on nonaccrual status when management determines that the full repayment of principal and collection of interest according to contractual terms is no longer likely, generally when the loan becomes 90 days or more past due. There were no loans greater than 90 days past due and still accruing as of September 30, 2026 and December 31, 2025.

Nonaccrual loans by loan portfolio class, including loans acquired with credit deterioration, as of September 30, 2026 and December 31, 2025 are summarized as follows:

The amount of interest income recognized on nonaccrual loans was approximately $203 thousand and $840 thousand during the three months ended September 30, 2026 and 2025, respectively. During the nine months ended September 30, 2026 and 2025, the amount of interest income recognized on nonaccrual loans was approximately $2.7 million and $1.6 million, respectively.

Credit Quality Indicators

Mid Penn categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt, such as current financial information, historical payment experience, credit documentation, public information and current economic trends, among other factors. On a minimum of a quarterly basis, Mid Penn analyzes loans individually to classify the loans as to their credit risk. The following table presents risk ratings by loan portfolio segment and origination year, which is the year of origination or renewal.

PASS - This type of classification consists of 6 subcategories:

Nominal Risk / Pass - This loan classification is a credit extension of the highest quality.

Moderate Risk / Pass - This type of classification has strong financial ratios, substantial debt capacity, and low leverage with a very favorable comparison to industry peers or better than average improving trends.

Good Acceptable Risk / Pass - This type of classification is a reasonable credit risk having financial ratios on par with its peers and demonstrates slightly improving trends over time; the Borrower lists good quality assets with relatively low leverage and ample debt capacity.

Average Acceptable Risk / Pass - This type of classification has financial ratios and assets that are of above average quality; however, the leverage is worse than average compared to industry standards; the Borrower should have a good repayment history and possess consistent earnings with some growth.

Marginally Acceptable Risk / Pass - This type of classification has financial ratios consistent with industry averages, assets of average quality with ascertainable values, acceptable leverage, moderate capital assets and an acceptable reliance on trade debt; however, the Borrower demonstrates marginally adequate earnings, cash flow and debt service plus positive trends.

Weak/Monitor Risk (Watch list) / Pass - This type of classification has financial ratios that are slightly below standard industry averages and assets are below average quality with unstable values; fixed assets could be near or at the end of their useful life and liabilities may not match the asset structure.

SPECIAL MENTION - These credits have developing weaknesses deserving extra attention from the lender and lending management. They are currently protected, but potentially weak. The weakness may be cash flow, leverage, liquidity, management, industry or other factors which may, if not checked or corrected, weaken the asset or inadequately protect the Bank’s credit position at some future date.

SUBSTANDARD - These credit extensions also have well defined weaknesses, which are inadequately protected by the current worth and debt service capacity of the Borrower or the collateral pledged, if any. The repayment of principal and interest as originally intended can be jeopardized by defined weaknesses related to adverse financial, managerial, economic, market or political conditions.

DOUBTFUL - These credits have definite weaknesses inherent in Substandard loans with added characteristics that are severe enough to make further collection in full highly questionable and improbable based on the current trends.

LOSS - These loans are considered uncollectible and no longer a viable asset of the Bank. They lack an identifiable source of repayment based on an inability to generate sufficient cash flow to service their debt. All trends are negative and the damage to the financial condition of the borrower can’t be reversed now or in the near future.

The following table presents risk ratings by loan portfolio segment and origination year, which is the year of origination or renewal:

Mid Penn had no loans classified as "doubtful" as of September 30, 2026 and December 31, 2025. There was $1.3 million and $567 thousand in mortgage loans for which formal foreclosure proceedings were in process at September 30, 2026 and December 31, 2025, respectively.

Collateral-Dependent Loans

A financial asset is considered to be collateral-dependent when the debtor is experiencing financial difficulty and repayment is expected to be provided substantially through the sale or operation of the collateral. For all classes of financial assets deemed collateral-dependent, Mid Penn elected the practical expedient to estimate expected credit losses based on the collateral’s fair value less cost to sell. In most cases, Mid Penn records a partial charge-off to reduce the loan’s carrying value to the collateral’s fair value less cost to sell. Substantially all of the collateral supporting collateral-dependent financial assets consists of various types of real estate, including residential properties; commercial properties such as retail centers, office buildings, and lodging; agriculture land; and vacant land. Total collateral-dependent loans as of September 30, 2026 were $36.7 million, compared to $23.0 million as of December 31, 2025.

Allowance for Credit Losses

Mid Penn’s ACL - loans methodology follows guidance within FASB ASC Subtopic 326-20. The ACL - loans is a valuation account that is deducted from the loans’ amortized cost basis to present the net amount expected to be collected on the loans. Credit quality within the loan portfolio is continuously monitored by management and is reflected within the ACL - loans. The ACL - loans is an estimate of expected losses inherent within Mid Penn’s existing loan portfolio. The ACL - loans is adjusted through the PCL and reduced by the charge off of loan amounts, net of recoveries.

The ACL for individual loans, such as nonaccrual and PCD, that do not share risk characteristics with other loans is measured as the difference between the discounted value of expected future cash flows, based on the effective interest rate at origination, and the amortized cost basis of the loan, or the net realizable value. The ACL is the difference between the loan’s net realizable value and its amortized cost basis (net of previous charge-offs and deferred loan fees and costs), except for collateral-dependent loans. A loan is collateral dependent when the borrower is experiencing financial difficulty and repayment of the loan is expected to be provided substantially through the sale of the collateral. The expected credit loss for collateral-dependent loans is measured as the difference between the amortized cost basis of the loan and the fair value of the collateral, adjusted for the estimated cost to sell. Fair value estimates for collateral-dependent loans are derived from appraised values based on the current market value or the "as is" value of the collateral, normally from recently received and reviewed appraisals. Current appraisals are ordered on a regular basis based on the inspection date or more often if market conditions necessitate. Appraisals are obtained from state-certified appraisers and are based on certain assumptions, which may include construction or development status and the highest and best use of the property. These appraisals are reviewed by Mid Penn’s Real Estate Administration Department to ensure they are acceptable, and values are adjusted down for costs associated with asset disposal. If the calculated expected credit loss is determined to be permanent or not recoverable, the amount of the expected credit loss is charged off.

Mid Penn may also purchase loans or acquire loans through a business combination. At the purchase or acquisition date, loans are evaluated to determine whether there has been more than insignificant credit deterioration since origination. Loans that have experienced more than insignificant credit deterioration since origination are referred to as PCD loans. At the purchase or acquisition date, the amortized cost basis of PCD loans includes the purchase price and the initial estimate of credit losses.

Effective January 1, 2026, the Corporation adopted ASU 2025-08 for applicable purchased seasoned loans ("PSL loans"), under which an initial allowance for credit losses is recognized at acquisition and incorporated into the initial amortized cost basis of the loans, rather than recognized through a Day 1 provision expense. The impact of adoption is reflected in the ACL rollforward in this Note and is further discussed in "Note 1 - Summary of Significant Accounting Policies".

Loans are charged off against the ACL, with any subsequent recoveries credited back to the ACL-loans account. Expected recoveries may not exceed the aggregate of amounts previously charged off and expected to be charged off.

The following tables present the activity in the ACL - loans by portfolio segment for the three and nine months ended September 30, 2026 and the three and nine months ended September 30, 2025:

(1) Includes a $977 thousand initial allowance on PCD loans acquired in the 1st Colonial acquisition on February 27, 2026.

(2) Includes a $3.4 million initial allowance on PSL loans acquired in the 1st Colonial acquisition on February 27, 2026.

(3) Commercial and industrial recoveries for the three months ended September 30, 2026 include an adjustment related to recoveries on loans acquired in the 1st Colonial acquisition.

(1) Includes a $2.3 million initial provision on non-PCD loans acquired in the William Penn acquisition.

Modifications to Borrowers Experiencing Financial Difficulty

From time to time, we may modify certain loans to borrowers who are experiencing financial difficulty. In some cases, these modifications may result in new loans. Loan modifications to borrowers experiencing financial difficulty may be in the form of principal forgiveness, an interest rate reduction, an other-than-insignificant payment delay, or a term extension, or a combination thereof, among other things.

There wereno new modifications to borrowers experiencing financial difficulty for the quarter ended September 30, 2026.

Information related to loans modified for the nine months ended September 30, 2026, whereby the borrower was experiencing financial difficulty at the time of modification, is set forth in the following table:

There wereno loan modifications to borrowers experiencing financial difficulty for the three and nine months ended September 30, 2025.

The financial effects of the loan modifications reduced the monthly payment amounts for the borrower and the term extensions in the table above added a weighted-average of 1.7 years to the life of the loan, which also reduced the monthly payment amounts for the borrower.

As of September 30, 2026, there wereno defaults on loans modified to borrowers experiencing financial difficulty within the twelve months following modification.

Note 5 -Deposits

Deposits consisted of the following as of September 30, 2026 and December 31, 2025:

The scheduled maturities of time deposits at September 30, 2026 were as follows:

Mid Penn had $105.0 million and $97.5 million of brokered certificates of deposits as of September 30, 2026 and December 31, 2025, respectively. As of September 30, 2026 and December 31, 2025, Mid Penn had $101.6 million and $83.2 million, respectively, of Certificate of Deposit Account Registry ("CDAR") deposits.

Note 6 -Derivative Financial Instruments

Mid Penn manages its exposure to certain interest rate risks through the use of derivative financial instruments; however, none are entered into for speculative purposes. During the three months ended September 30, 2026, Mid Penn had outstanding derivative contracts designated as hedges. Mid Penn’s free-standing derivative financial instruments are required to be carried at their fair value on the Consolidated Balance Sheets.

Loan-level Interest Rate Swaps

Mid Penn enters into loan-level interest rate swaps with certain qualifying commercial loan customers to meet their interest rate risk management needs. Mid Penn simultaneously enters into loan-level interest rate swaps with dealer counterparties, with identical notional amounts and terms. The net result of the offsetting customer and dealer counterparty swap agreements is that the customer pays a fixed rate of interest, while Mid Penn receives a floating rate. Mid Penn’s loan-level interest rate swaps are considered derivatives but are not accounted for using hedge accounting. These transactions are structured as back-to-back arrangements with offsetting terms; however, the Corporation remains exposed to credit risk associated with both the customer and dealer counterparties.

Information related to loan-level interest rate swaps is set forth in the following table:

Cash Flow Hedges of Interest Rate Risk

Mid Penn’s objectives in using interest rate derivatives are to reduce volatility in net interest income and to manage its exposure to interest rate movements. To accomplish this objective, Mid Penn primarily uses derivatives designed as cash flow hedges as part of its interest rate risk management strategy.

Cash Flow Hedges of Brokered Certificates of Deposit:

Mid Penn designated an interest rate swap as a cash flow hedge for certain brokered certificates of deposit. The interest rate swap was terminated during the second quarter of 2026.

(1) Estimated fair value, net of accrued interest receivable, is disclosed in Other Assets on the Consolidated Balance Sheet.

Cash Flow Hedge of Variable-Rate Loans:

Mid Penn designated an interest rate floor as a cash flow hedge of forecasted interest cash flows associated on certain variable-rate loans.

Information related to the cash flow hedge is set forth in the following table:

(1) Estimated fair value, net of accrued interest receivable, is disclosed in Other Assets on the Consolidated Balance Sheet.

For derivatives designated and qualifying as cash flow hedges of interest rate risk, the unrealized gain or loss is recorded in AOCI and subsequently reclassified into interest income in the same period during which the hedged transaction affects earnings. Amounts reported in AOCI related to derivatives will be reclassified to interest income as interest payments are made on Mid Penn’s variable-rate liabilities. During the next twelve months, Mid Penn estimates that an additional $601 thousand will be reclassified to interest expense.

Note 7 -Accumulated Other Comprehensive (Loss)/Income

The components of accumulated other comprehensive (loss)/income, net of taxes, are as follows:

Note 8 -Fair Value Measurement

Mid Penn uses estimates of fair value in applying various accounting standards for its consolidated financial statements on either a recurring or non-recurring basis. Fair value is defined as the price that would be received to sell an asset or transfer a liability in an orderly transaction between willing and able market participants. Mid Penn groups its assets and liabilities measured at fair value in three hierarchy levels, based on the observability and transparency of the inputs. The fair value hierarchy is as follows:

Level 1 - Inputs that represent quoted prices for identical instruments in active markets.

Level 2- Inputs that represent 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.

Level 3- Inputs that are largely unobservable, as little or no market data exists for the instrument being valued.

A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below.

There were no transfers of assets between fair value Level 1 and Level 2 of the fair value hierarchy during the three and nine months ended September 30, 2026 or the year ended December 31, 2025.

The following tables illustrate the assets and liabilities measured at fair value on a recurring basis and reported on the Consolidated Balance Sheets.

The valuation methodologies and assumptions used to estimate the fair value for the items in the preceding tables are as follows:

Available for sale investment securities - The fair value of equity and debt securities classified as available-for-sale is determined by obtaining quoted market prices on nationally recognized securities exchanges (Level 1), or matrix pricing (Level 2). Matrix pricing is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted market prices for the specific securities, but rather, relying on the securities’ relationship to other benchmark quoted prices.

Equity securities -The fair value of equity securities with readily determinable fair values is recorded on the Consolidated Balance Sheet, with realized and unrealized gains and losses reported in other expense on the Consolidated Statements of Income. These securities consist primarily of publicly traded equity securities and are classified within Level 1 in the fair value hierarchy.

Loans held for sale - This category includes mortgage loans held-for-sale that are measured at fair value on a recurring basis. Fair values as of September 30, 2026 were measured as the price that secondary market investors were offering for loans with similar characteristics.

Derivative instruments - Interest rate swaps and interest rate floors are measured by alternative pricing sources with reasonable levels of price transparency in markets that are not active. Based on the complex nature of interest rate swap agreements, the markets these instruments trade in are not as active or liquid as those for more mature Level 1 markets. These markets do, however, have comparable, observable inputs in which an alternative pricing source values these assets in order to arrive at a fair market value. These characteristics classify interest rate swap agreements as Level 2.

Mortgage banking derivatives - represent the fair value of mortgage banking derivatives in the form of interest rate locks and forward commitments with secondary market investors and the fair value of interest rate swaps. The fair values of Mid Penn’s interest rate locks, forward commitments and interest rate swaps represent the amounts that would be required to settle the derivative financial instruments at the balance sheet date. These characteristics classify mortgage banking derivatives as Level 3.

Certain financial assets and financial liabilities are measured at fair value on a nonrecurring basis. These instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, upon acquisition or when there is evidence of impairment).

The following table illustrates financial instruments measured at fair value on a nonrecurring basis:

Net loans - This category consists of loans that were individually evaluated for credit losses, net of the related ACL, and have been classified as Level 3 assets. All of Mid Penn’s individually evaluated loans for 2026 and 2025, whether reporting

a specific allowance allocation or not, are considered collateral-dependent. Mid Penn utilized Level 3 inputs such as independent appraisals of the underlying collateral, which generally includes Level 3 inputs which are not observable. Appraisals may be adjusted downward by management for qualitative factors such as economic conditions and estimated liquidation expenses.

Foreclosed assets held-for-sale - Values are based on appraisals that consider the sales prices of property in the proximate vicinity.

The following table presents additional information about the valuation techniques for level 3 assets measured at fair value on a nonrecurring basis:

The following tables present the carrying amount, fair value, and placement in the fair value hierarchy of Mid Penn's financial instruments as of the periods presented:

(1)Long-term debt excludes finance lease obligations.

(2)Level 1 accrued interest receivable consists primarily of other short-term receivables for which carrying value approximates fair value.

(1)Long-term debt excludes finance lease obligations.

(2)Level 1 accrued interest receivable consists primarily of other short-term receivables for which carrying value approximates fair value.

The Bank’s outstanding and unfunded credit commitments and financial standby letters of credit were deemed to have no significant fair value as of September 30, 2026 and December 31, 2025.

Note 9 -Commitments and Contingencies

Guarantees and commitments to extend credit

Mid Penn is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These instruments include commitments to extend credit and standby letters of credit. Commitments to extend credit are agreements to lend to a customer unless there is a violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Mid Penn evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary upon extension of credit, is based on management’s credit evaluation of the customer. Standby letters of credit and financial guarantees written are conditional commitments to guarantee the performance of a customer to a third party. Those guarantees are primarily issued to support public and private borrowing arrangements. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loans to customers. Mid Penn had $95.4 million and $66.5 million of standby letters of credit outstanding as of September 30, 2026 and December 31, 2025, respectively. Mid Penn does not anticipate any losses because of these transactions. The amount of the liability as of September 30, 2026 and December 31, 2025 for payment under standby letters of credit issued was not considered material.

Mid Penn is required to estimate expected credit losses for OBS credit exposures which are not unconditionally cancellable. Mid Penn maintains a separate ACL on credit-related OBS commitments, including unfunded loan commitments and letters of credit, which is included in other liabilities on the accompanying Consolidated Balance Sheets.

The ACL - OBS is adjusted as a provision for OBS commitments in provision for credit losses. The estimate includes consideration of the likelihood that funding will occur, an estimate of exposure at default that is derived from utilization rate assumptions using a non-modeled approach, and PD and LGD estimates derived from the same models and approaches used for Mid Penn's other loan portfolio segments described in "Note 4 - Loans and Allowance for Credit Losses - Loans" above, as these unfunded commitments share similar risk characteristics with these loan portfolio segments.

The ACL - OBS was $2.8 million and $2.9 million as of September 30, 2026 and December 31, 2025, respectively. A benefit for credit losses related to credit commitments of $243 thousand and $247 thousand were recorded for the three months ended September 30, 2026 and September 30, 2025, respectively. A benefit for credit losses related to credit commitments of $326 thousand and a provision for credit losses related to credit commitments of $32 thousand were recorded for the nine months ended September 30, 2026 and September 30, 2025, respectively.

The following table presents the activity in the ACL - OBS by segment for the three and nine months ended September 30, 2026 and 2025:

(1) Includes a$220 thousand initial allowance on unfunded commitments acquired in the 1st Colonial acquisition.

(1) Includes a$275 thousand initial allowance on unfunded commitments acquired in the William Penn acquisition.

Litigation

Mid Penn and its subsidiaries are subject to various pending and threatened legal proceedings or other matters arising out of the normal conduct of business in which claims for monetary damages are asserted. As of the date of this report, management, after consultation with legal counsel, does not anticipate that the aggregate ultimate liability arising out of such pending or threatened matters will be material to Mid Penn’s consolidated financial position. On at least a quarterly basis, Mid Penn assesses its liabilities and contingencies in connection with such matters. For those matters where it is probable that Mid Penn will incur losses and the amounts of the losses can be reasonably estimated, Mid Penn records an expense and corresponding liability in its consolidated financial statements. To the extent such matters could result in exposure in excess of that liability, the amount of such excess is not currently estimable. The range of losses for matters where an exposure is not currently estimable or considered probable is not believed to be material in the aggregate. This is based on information currently available to Mid Penn and involves elements of judgment and significant uncertainties. While Mid Penn does not believe that the outcome of pending or threatened litigation or other matters will be material to Mid Penn’s consolidated financial position, it cannot rule out the possibility that such outcomes will be material to the consolidated results of operations for a particular reporting period in the future. In addition, regardless of the ultimate outcome of any such legal proceeding, inquiry or investigation, any such matter could cause Mid Penn to incur additional expenses, which could be significant, and possibly material, to Mid Penn’s results of operations in any future period.

Note 10 -Debt

Short-term FHLB and Correspondent Bank Borrowings

Total short-term borrowings were $68.0 million and $20.8 million as of September 30, 2026 and December 31, 2025, respectively. Short-term borrowings generally consist of federal funds purchased and advances from the FHLB with an original maturity of less than one year. Federal funds purchased from correspondent banks mature inone business day and are repriced daily based on the federal funds rate. Advances from the FHLB are collateralized by the Bank’s investment in FHLB common stock and by a blanket lien on selected loan receivables comprised principally of real estate secured loans. As of September 30, 2026, the amount of loans pledged totaled $3.3 billion. As of September 30, 2026, the Bank's unused short-term borrowing capacity with the FHLB totaled $1.8 billion (equal to $2.3 billion of maximum borrowing capacity, less the aggregate amount of FHLB letters of credit securing public funds deposits, and other FHLB advances and obligations outstanding) upon satisfaction of any stock purchase requirements of the FHLB.

The Bank also maintained unused overnight lines of credit with other correspondent banks totaling $35.0 million as of September 30, 2026. No draws have been made on these lines of credit as of September 30, 2026 and December 31, 2025, respectively.

Long-term Debt

The following table presents a summary of long-term debt as of September 30, 2026 and December 31, 2025.

As a member of the FHLB, the Bank can access a number of credit products which are utilized to provide liquidity. As of September 30, 2026 and December 31, 2025, the Bank had long-term debt outstanding in the amount of $2.8 million and $23.1 million, respectively, consisting of FHLB fixed rate instruments, and a finance lease liability.

The FHLB fixed rate instruments are secured under the terms of a blanket collateral agreement with the FHLB consisting of FHLB stock and qualifying Mid Penn loan receivables, principally real estate secured loans. Mid Penn also obtains letters of credit from the FHLB to secure certain public fund deposits of municipalities and school district customers which are used as a legally allowable alternative to investment in securities. These FHLB letter of credit commitments totaled $454.1 million and $162.5 million as of September 30, 2026 and December 31, 2025, respectively.

Note 11 -Subordinated Debt

Subordinated Debt Assumed November 2021 with the Riverview Acquisition

On November 30, 2021, Mid Penn completed its acquisition of Riverview and assumed $25.0 million of subordinated notes (the "Riverview Notes"). In accordance with purchase accounting principles, the Riverview Notes were recorded at fair value, including a premium of $2.3 million. The notes were treated as Tier 2 capital for regulatory reporting purposes.

The Riverview Notes were issued by Riverview on October 6, 2020 in a private placement to certain qualified institutional buyers and accredited institutional investors. The Riverview Notes had a maturity date of October 15, 2030 and initially bore interest at a fixed rate of 5.75% per annum before converting to a floating rate prior to redemption. The Riverview Notes were redeemable beginning on October 15, 2025, and Mid Penn redeemed all of the Riverview Notes on such date.

Subordinated Debt Issued December 2020

On December 22, 2020, Mid Penn issued $12.2 million of subordinated notes due December 2030 (the "December 2020 Notes") in a private placement to qualified institutional buyers and accredited investors. The December 2020 Notes were treated as Tier 2 capital for regulatory capital purposes.

The December 2020 Notes initially bore interest at a fixed rate of 4.5% per annum before converting to a floating rate prior to redemption. The December 2020 Notes became redeemable beginning December 31, 2025, and Mid Penn redeemed all of the December 2020 Notes on such date.

Outstanding Balance

As of September 30, 2026, the Corporation hadno subordinated debt outstanding.

Note 12 -Common Stock and Equity Incentive Plans

Treasury Stock Repurchase Program

Mid Penn adopted a treasury stock repurchase program ("Program") initially effective March 19, 2020. On April 21, 2026, the Board of Directors renewed the Program through April 30, 2027 and approved an increase in repurchase authorization permitting the repurchase of up to an additional $50.0 million of Mid Penn’s outstanding common stock. Under the Program, Mid Penn conducts repurchases of its common stock through open market transactions (which may be by means of a trading plan adopted under SEC Rule 10b5-1) or in privately negotiated transactions. Repurchases under the Program are made at the discretion of management and are subject to market conditions and other factors. There is no guarantee as to the exact number of shares that Mid Penn may repurchase. The Program is able to be modified, suspended or terminated at any time, at Mid Penn’s discretion, based upon a number of factors, including liquidity, market conditions, the availability of alternative investment opportunities and other factors Mid Penn deems appropriate. The Program does not obligate Mid Penn to repurchase any shares.

During the nine months ended September 30, 2026, Mid Penn repurchased 76,000 shares of common stock at an average price of $32.78. There wereno shares repurchased during the three months ended September 30, 2026. As of September 30, 2026, Mid Penn has repurchased an aggregate total of 595,891 shares of common stock under the Program at an average price of $24.82 per share.

Dividend Reinvestment Plan

The amended and restated Dividend Reinvestment Plan of Mid Penn Bancorp, Inc. allows holders of the Corporation's common shares to purchase additional shares of the Corporation's common stock, par value $1.00 per share. Under the plan, participants may have cash dividends on all of their shares automatically reinvested, and each participating shareholder may also make optional cash contributions to purchase additional shares.

As of September 30, 2026, participants in the plan held 497,435 shares of the Corporation's common stock.

Equity Incentive Plans

The Corporation recognizes stock-based compensation expense for equity awards based on the grant-date fair value of the awards. Compensation expense is recognized on a straight-line basis over the requisite service period and is included in salaries and benefits expense in the Consolidated Statements of Income.

On May 9, 2023, shareholders approved the 2023 Stock Incentive Plan (the "2023 Plan"), which authorizes Mid Penn to grant incentive stock options, nonqualified stock options, stock appreciation rights, restricted stock, deferred stock units and performance shares. The 2023 Plan was established for employees and directors of Mid Penn and the Bank, selected by the Compensation Committee of the Board of Directors, to incentivize the further success of the Corporation, and replaced the 2014 Restricted Stock Plan (the "2014 Plan", and together with the 2023 Plan, the "Plans"). The aggregate number of shares of common stock available for issuance under the Plans is 550,000 shares.

As of September 30, 2026, a total of 390,982 restricted shares were granted under the Plans, of which 132,773 shares were unvested. The Plan's shares granted and vested resulted in $742 thousand and $1.1 million in share-based compensation expense for the three months ended September 30, 2026 and 2025, respectively. For the nine months ended September 30, 2026 and 2025, the Plan's shares granted and vested resulted in share-based compensation expense of $1.8 million and $3.8 million, respectively.

Stock-based compensation expense relating to restricted stock is calculated using grant date fair value and is recognized on a straight-line basis over the vesting periods of the awards. Restricted shares granted to employees vest in equal amounts on the anniversary of the grant date over the vesting period and the expense is a component of salaries and benefits expense on the Consolidated Statement of Income. The employee grant vesting period is determined by the terms of each respective grant, with vesting periods generally betweenone andfour years. Restricted shares granted to directors have atwelve-month vesting period, and the expense is a component of directors’ fees and benefits within the other expense line item on the Consolidated Statement of Income.

Equity Awards Assumed from William Penn Acquisition

In connection with the acquisition of William Penn on April 30, 2025, the Corporation issued 3,506,795 shares of common stock as purchase consideration and assumed outstanding equity awards of William Penn, resulting in the issuance of 538,447 stock options and 215,386 restricted stock units "RSUs" of which,44,511 stock options and 20,605 RSUs remained unvested as of September 30, 2026.

Compensation expense for stock options was $116 thousand and $378 thousand for the three and nine months ended September 30, 2026, respectively. As of September 30, 2026, unrecognized compensation expense related to unvested options was $334 thousand. Compensation expense for restricted stock awards was $161 thousand and $527 thousand for the three and nine months ended September 30, 2026, respectively. As of September 30, 2026, unrecognized compensation cost related to unvested restricted stock was $462 thousand.

The assumed awards are subject to the original vesting terms and conditions included in William Penn's stock-based compensation plan.

Stock Appreciation Rights Issued in Connection with the Cumberland Advisors Acquisition

Stock appreciation rights issued in the acquisition of Cumberland Advisors are being accounted for as post-combination compensation expense and will be recognized over the applicable service period. The stock appreciation rights have a maximum aggregate value of $1.2 million to be exercisable between the first and third anniversary of the closing date of the transaction.

Note 13 -Earnings Per Share

Basic earnings per share ("EPS") is computed by dividing net income available to common shareholders by the weighted-average number of common shares outstanding during the period. Diluted EPS is computed by dividing net income available to common shareholders by the weighted-average number of common shares outstanding plus the effect of potentially dilutive common shares, which include stock options and unvested restricted stock awards, using the treasury stock method.

The following data sets forth the computation of basic and diluted earnings per common share:

Anti-dilutive shares are common stock equivalents with weighted-average exercise prices in excess of the weighted-average market value for the periods presented. There wereno anti-dilutive stock options excluded from diluted earnings per share for the three and nine months ended September 30, 2026, respectively. There were 8,480 antidilutive instruments for the three and nine months ended September 30, 2025, respectively. Dilutive common stock equivalents included issued equity awards acquired in the William Penn acquisition.

As part of the acquisition of William Penn on April 30, 2025, the Corporation issued 3,506,795 shares of common stock as purchase consideration, and assumed outstanding equity awards of William Penn, consisting of 538,447 stock options and 215,386 restricted stock units (RSUs).

As part of the acquisition of Cumberland Advisors on January 1, 2026, Mid Penn issued 127,009 shares of common stock as purchase consideration.

As part of the acquisition of 1st Colonial on February 27, 2026, Mid Penn issued 2,111,076 shares of common stock as purchase consideration. These shares contributed to the increase in weighted-average shares outstanding for the nine months ended September 30, 2026.

Note 14 -Segment Reporting

Mid Penn operates as a single reportable segment, providing a broad range of banking and financial services to individuals, businesses, and institutional clients. These services include commercial and consumer lending, deposit products, wealth management, insurance, and treasury management solutions. The Chief Executive Officer and the Chief Financial Officer together act as Mid Penn Chief Operating Decision Makers ("CODM"). The CODM regularly evaluates financial performance and allocates resources on a consolidated basis.

The following table presents financial information reviewed by the CODM in assessing performance and allocating resources:

Other Segment Information

Revenue Composition: Mid Penn generates revenue primarily from net interest income and non-interest income, including fees from deposit accounts, wealth management, insurance, and treasury services.

Capital Allocation & Performance Metrics: The CODM assesses performance based on key financial metrics, including net interest margin, return on average assets ("ROA"), return on average equity ("ROE") and core efficiency ratio.