BankUnited Inc

Note 1 Basis of Presentation and Summary of Significant Accounting Policies

BankUnited, Inc. is a bank holding company with one wholly-owned subsidiary, BankUnited, collectively, the Company. BankUnited, a national banking association headquartered in Miami Lakes, Florida, provides a full range of commercial lending and both commercial and consumer deposit services through 53 banking centers located in 12 Florida counties, four banking centers in the New York metropolitan area, andone banking center in Dallas, Texas. The Bank offers a comprehensive suite of commercial lending and deposit products through an Atlanta office focused on the Southeast region, certain commercial lending and deposit products through national platforms and certain consumer deposit products through an online channel.

The consolidated financial statements have been prepared in accordance with GAAP and prevailing practices in the banking industry.

The Company has a single operating segment and thus a single reportable segment. While management monitors the revenue streams of its various business units, the business units serve a similar base of primarily commercial clients, providing a similar range of products and services, managed through similar processes and platforms. The Company’s chief operating decision maker makes company-wide resource allocation decisions and assessments of performance based on a collective assessment of the Company’s operations.

Accounting Estimates

In preparing the consolidated financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses and disclosures of contingent assets and liabilities. Actual results could differ significantly from these estimates.

The most significant estimate impacting the Company's consolidated financial statements is the ACL.

Principles of Consolidation

The consolidated financial statements include the accounts of BankUnited, Inc. and its wholly-owned subsidiary. All significant intercompany balances and transactions have been eliminated in consolidation. VIEs are consolidated if the Company is the primary beneficiary; i.e., has (i) the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and (ii) the obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. The Company has variable interests in affordable housing limited partnerships that are not required to be consolidated because the Company is not the primary beneficiary.

Fair Value Measurements

Certain of the Company's assets and liabilities are reflected in the consolidated financial statements at fair value on either a recurring or non-recurring basis. Investment securities available for sale, marketable equity securities and derivative instruments are measured at fair value on a recurring basis. Assets measured at fair value or fair value less cost to sell on a non-recurring basis may include collateral dependent loans, OREO and other repossessed assets, loans held for sale, goodwill and impaired long-lived assets. These non-recurring fair value measurements typically involve lower-of-cost-or-market accounting or the measurement of impairment of certain assets.

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date. GAAP establishes a hierarchy that prioritizes inputs used to determine fair value measurements into three levels based on the observability and transparency of the inputs:

•Level 1 inputs are unadjusted quoted prices in active markets that are accessible at the measurement date for identical assets or liabilities.

•Level 2 inputs are observable inputs other than level 1 inputs, including quoted prices for similar assets and liabilities, quoted prices for identical assets and liabilities in less active markets and other inputs that can be corroborated by observable market data.

•Level 3 inputs are unobservable inputs supported by limited or no market activity or data and inputs requiring significant management judgment or estimation.

The fair value hierarchy requires the Company to maximize the use of observable inputs and minimize the use of unobservable inputs in estimating fair value. Unobservable inputs are utilized in determining fair value measurements only to the extent that observable inputs are unavailable. The need to use unobservable inputs generally results from a lack of market liquidity and diminished observability of actual trades or assumptions that would otherwise be available to value a particular asset or liability.

Cash and Cash Equivalents

Cash and cash equivalents include cash and due from banks, both interest bearing and non-interest bearing, including amounts on deposit at the Federal Reserve Bank. Cash equivalents have original maturities of three months or less. For purposes of reporting cash flows, cash receipts and payments pertaining to FHLB advances with original maturities of three months or less are reported net.

Investment Securities

Debt securities that the Company has the positive intent and ability to hold to maturity are classified as held to maturity and reported at amortized cost. Debt securities that the Company may not have the intent to hold to maturity are classified as available-for-sale at the time of acquisition and carried at fair value with unrealized gains and losses, net of tax, excluded from earnings and reported in AOCI, a separate component of stockholders' equity. Securities classified as available-for-sale may be used as part of the Company's asset/liability management strategy and may be sold in response to liquidity needs, regulatory changes, changes in interest rates, prepayment risk or other market factors. The Company does not maintain a trading portfolio. Purchase premiums and discounts on debt securities are amortized as adjustments to yield over the expected lives of the securities, using the interest method which results in a constant effective yield. Premiums are amortized to the call date for callable securities. Realized gains and losses from sales of securities are recorded on the trade date and are determined using the specific identification method. The Company's policy on the ACL related to debt securities is discussed below in the section entitled "ACL".

Marketable equity securities with readily determinable fair values are reported at fair value with unrealized gains and losses included in earnings.

Non-marketable Equity Securities

The Bank, as a member of the FRB system and the FHLB, is required to maintain investments in the stock of the FRB and FHLB. No market exists for this stock, and the investment can be liquidated only through redemption by the respective institutions, at the discretion of and subject to conditions imposed by those institutions. The stock has no readily determinable fair value and is carried at cost. Historically, stock redemptions have been at par value, which equals the Company's carrying value. The Company monitors its investment in FRB and FHLB stock for impairment through review of recent financial results of the FHLB, including capital adequacy and liquidity position, dividend payment history, redemption history and information from credit agencies. The Company has not identified any indicators of impairment of the FRB or FHLB stock.

Loans Held for Sale

Loans originated or purchased with the intent to sell are carried at the lower of cost or fair value, determined in the aggregate for buyout loans. A valuation allowance is established through a charge to earnings if the aggregate fair value of such loans is lower than their cost. Gains or losses recognized upon sale are determined on the specific identification basis.

Loans not originated or otherwise acquired with the intent to sell, or loans which have been originated by the Company and subsequently held for sale, are transferred into the held for sale classification at the lower of carrying amount or fair value when they are specifically identified for sale and a formal plan exists to sell them.

Loans

Loans are reported at amortized cost, net of the ACL. Interest income is accrued based on the principal amount outstanding. Non-refundable loan origination fees, net of direct costs of originating or acquiring loans, as well as purchase premiums and discounts, are deferred and recognized as adjustments to yield over the contractual lives of the related loans using the interest method which results in a constant effective yield.

Non-accrual loans

Commercial loans are placed on non-accrual status when (i) management has determined that full repayment of all contractual principal and interest is in doubt, or (ii) the loan is past due 90 days or more as to principal or interest unless the loan is well secured and in the process of collection. Residential loans, other than government insured residential loans, are generally placed on non-accrual status when they are 60 days past due. Additionally, certain residential loans not contractually delinquent but in forbearance may be placed on non-accrual status at management's discretion. When a loan is placed on non-accrual status, uncollected interest accrued is reversed and charged to interest income. Payments received on non-accrual commercial loans are applied as a reduction of principal. Interest payments are recognized as income on a cash basis on non-accrual residential loans. Commercial loans are returned to accrual status only after all past due principal and interest has been collected and full repayment of remaining contractual principal and interest is reasonably assured. Residential loans are generally returned to accrual status when less than 60 days past due. Past due status of loans is determined based on the contractual next payment due date. Loans less than 30 days past due are reported as current.

Contractually delinquent government insured residential loans are not classified as non-accrual due to the nature of the guarantee. Contractually delinquent PCD loans are not classified as non-accrual, as long as the Company has a reasonable expectation about amounts expected to be collected.

Troubled Debt Restructurings

Prior to the adoption of ASU 2022-02 on January 1, 2023, in certain situations, due to economic or legal reasons related to a borrower's financial difficulties, the Company may have granted a concession to the borrower for other than an insignificant period of time that it would not otherwise have considered. At that time, the related loan was classified as a TDR. The concessions granted may have included rate reductions, principal forgiveness, payment forbearance, extensions of maturity at rates of interest below that commensurate with the risk profile of the loans, modification of payment terms and other actions intended to minimize economic loss. A TDR was generally placed on non-accrual status at the time of the modification unless the borrower was performing prior to the restructuring.

Section 4013 of the CARES Act, as amended by the Consolidated Appropriations Act on December 27, 2020, effectively suspended the guidance related to TDRs codified in ASC 310-40 through January 1, 2022. Pursuant to inter-agency and authoritative guidance and consistent with the CARES Act, short-term deferrals or modifications granted during the period this guidance was effective and related to COVID-19 typically were not categorized as TDRs.

PCD assets

PCD assets are acquired financial assets that, as of the date of acquisition, have experienced a more than insignificant deterioration in credit quality since origination. An assessment is conducted at acquisition to determine whether acquired financial assets meet the criteria to be classified as PCD assets. That assessment may be conducted at the individual asset level, or for a group of assets acquired together that have similar risk characteristics. At acquisition, the ACL related to PCD assets, representing the estimated amount of the UPB of the assets not expected to be collected, is added to the purchase price to determine the amortized cost basis and any non-credit related discount or premium is allocated to the individual assets acquired. The non-credit related discount or premium is accreted or amortized to interest income over the life of the related assets using the level yield method, as long as there is a reasonable expectation about amounts expected to be collected. Subsequent changes in the amount of expected credit losses are recognized immediately by adjusting the ACL and reflecting the periodic changes as credit loss expense or reversal of credit loss expense.

Sales-type and Direct Financing Leases

Sales-type and direct financing leases are carried at the aggregate of lease payments receivable and estimated residual value of the leased property, if applicable, less unearned income. Interest income is recognized over the term of the leases to achieve a constant periodic rate of return on the outstanding investment.

ACL

AFS Debt Securities

The Company reviews its AFS debt securities for credit loss impairment at the individual security level at least quarterly. A security is impaired if its fair value is less than its amortized cost basis. A decline in fair value below amortized cost basis represents a credit loss impairment to the extent the Company does not expect to recover the amortized cost basis of the security. Impairment related to credit losses is recorded through the ACL to the extent fair value is less than the amortized cost basis. Declines in fair value that have not been recorded through the ACL are recorded through other comprehensive income, net of tax.

In assessing whether an impairment is credit loss related, the Company compares the present value of cash flows expected to be collected to the security's amortized cost basis. If the present value of cash flows expected to be collected is less than the amortized cost basis of the security, a credit loss exists, and an ACL is recorded. The Company discounts expected cash flows at the effective interest rate implicit in the security at the purchase date, adjusted for expected prepayments. For floating rate securities, the Company uses the floating rate as it changes over the life of the security. In developing estimates about cash flows expected to be collected and determining whether a credit loss exists, the Company considers information about past events, current conditions and reasonable and supportable forecasts. Factors and information that the Company uses in making its assessments include, but are not necessarily limited to, the following:

•The extent to which fair value is less than amortized cost;

•Adverse conditions specifically related to the security, an industry or sector or geographic area;

•Changes in the financial condition of the issuer or underlying loan obligors;

•The payment structure and remaining payment terms of the security, including levels of subordination or over-collateralization;

•Failure of the issuer to make scheduled payments;

•Changes in credit ratings;

•Relevant market data;

•Estimated prepayments, defaults, and the value and performance of underlying collateral at the individual security level.

The relative importance assigned to each of these factors varies depending on the facts and circumstances pertinent to the individual security being evaluated.

Timely payment of principal and interest on securities issued by the U.S. government, U.S. government agencies and U.S. government sponsored entities is explicitly or implicitly guaranteed by the U.S. government. Therefore, the Company expects to recover the amortized cost basis of these securities.

If the Company intends to sell a security in an unrealized loss position, or it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, any allowance for credit losses will be written off and the amortized cost basis will be written down to the debt security’s fair value at the reporting date with any incremental impairment reported in earnings.

AFS securities will be charged off to the extent that there is no reasonable expectation of recovery of amortized cost basis. AFS securities will be placed on non-accrual status if the Company does not reasonably expect to receive interest payments in the future and interest accrued will be reversed against interest income. Securities will be returned to accrual status only when collection of interest is reasonably assured.

Loans

The ACL is a valuation account that is deducted from the amortized cost basis of loans to present the net amount expected to be collected. The ACL is adjusted through the provision for credit losses to the amount of amortized cost basis not expected to be collected, or in the case of PCD loans, the amount of UPB not expected to be collected, at the balance sheet date.

Amortized cost basis includes UPB, unamortized premiums or discounts and deferred fees and costs, net of amounts previously charged off.

The measurement of expected credit losses encompasses information about historical events, current conditions and reasonable and supportable forecasts. Determining the amount of the ACL is complex and requires extensive judgment by management about matters that are inherently uncertain. Re-evaluation of the ACL estimate in future periods, in light of changes in composition and characteristics of the loan portfolio, changes in the reasonable and supportable forecast and other factors then prevailing may result in material changes in the amount of the ACL and credit loss expense in those future periods.

Loans are charged off against the ACL in the period in which they are deemed uncollectible, and recoveries are credited to the ACL when received. Expected recoveries on loans previously charged off and expected to be charged-off, not to exceed the aggregate of amounts previously charged-off and expected to be charged-off, are included in the ACL estimate. For loans secured by residential real estate, an assessment of collateral value is made at no later than 120 days delinquency; any outstanding loan balance in excess of fair value less cost to sell is charged off at no later than 180 days delinquency. Additionally, any outstanding balance in excess of fair value of collateral less cost to sell is charged off (i) within 60 days of receipt of notification of filing from the bankruptcy court, (ii) within 60 days of determination of loss if all borrowers are deceased or (iii) within 90 days of discovery of fraudulent activity. Other consumer loans, which are not significant in the aggregate, are typically charged off at 120 days delinquency. Commercial loans are charged off when, in management's judgment, they are considered to be uncollectible.

Expected credit losses are estimated on a collective basis for groups of loans that share similar risk characteristics. Factors that may be considered in aggregating loans for this purpose include but are not necessarily limited to, product or collateral type, industry, geography, internal risk rating, credit characteristics such as credit scores or collateral values, and historical or expected credit loss patterns. For loans that do not share similar risk characteristics with other loans such as collateral dependent loans, expected credit losses are estimated on an individual basis.

Expected credit losses are estimated over the contractual terms of the loans, adjusted for expected prepayments. Expected prepayments for commercial loans are generally estimated based on the Company's historical experience. For residential loans, expected prepayments are estimated using a model that incorporates industry prepayment data, calibrated to reflect the Company's experience. 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.

For the substantial majority of portfolio segments and subsegments, including residential loans other than government insured loans, and most commercial and commercial real estate loans, expected losses are estimated using econometric models. The models employ a factor based methodology, leveraging data sets containing extensive historical loss and recovery information by industry, geography, product type, collateral type and obligor characteristics, to estimate PD and LGD. Measures of PD for commercial loans incorporate current conditions through market cycle or credit cycle adjustments. For residential loans, the models consider FICO, adjusted LTVs and delinquency rates. PDs and LGDs are then conditioned on the reasonable and supportable economic forecast. Projected PDs and LGDs, determined based on pool level characteristics, are applied to estimated exposure at default, considering the contractual term and payment structure of loans, adjusted for expected prepayments, to generate estimates of expected loss. For criticized or classified loans, PDs are adjusted to benchmark PDs established for each risk rating given that the most current financial information available is often not reflective of the borrowers' current financial condition. The ACL estimate incorporates a reasonable and supportable economic forecast through the use of externally developed macroeconomic scenarios applied in the models.

A single economic scenario or a probability weighted blend of economic scenarios may be used. The models ingest numerous national, regional and MSA level variables and data points.

Commercial Real Estate Model

Variables with the most significant impact on the commercial real estate model include unemployment at both national and regional levels, the CRE property forecast by property type and sub-market, 10 year treasury yield, Baa corporate yield and real GDP growth, at the national level. Increases in unemployment and yields within the commercial real estate model result in increases in the ACL. Increases in real GDP growth and improvements in the CRE property forecasts reduce the reserve.

Commercial Model

Variables with the most significant impact on the commercial model include a stock market volatility index, the S&P 500 index, unemployment at both national and regional levels, and a variety of interest rates and spreads. Increases in the unemployment rate, the stock market volatility index, and the Baa corporate yield increase the reserve, while increases in real GDP growth reduce the reserve.

Residential Model

Variables with the most significant impact on the residential model include HPI and unemployment at regional levels, real GDP growth, and a 30 year mortgage rate. Increases in the unemployment rate and the 30-year mortgage rate increase the reserve, while increases in real GDP growth and HPI reduce the reserve.

The length of the reasonable and supportable forecast period is evaluated at each reporting period and adjusted if deemed necessary. Currently, the Company uses a 2-year reasonable and supportable forecast period in estimating the ACL. After the reasonable and supportable forecast period, the models effectively revert to long-term mean losses on a straight-line basis over 12 months.

For certain less material portfolios including loans and leases to state and local government entities originated by Pinnacle, small balance commercial loans and consumer loans, the WARM method is used to estimate expected credit losses. Loss rates are applied to the exposure at default, after factoring in amortization and expected prepayments. For the Pinnacle portfolio, historical loss information is based on municipal historical default and recovery data, segmented by credit rating. For small balance commercial loans, historical loss information is based on the Company's historical loss experience over a five year period. For consumer loans, historical loss information is based on peer data; this portfolio subsegment is not significant. All loss estimates are conditioned as applicable on changes in current conditions and the reasonable and supportable economic forecast. Expected credit losses for the funded portion of mortgage warehouse lines of credit are estimated based primarily on the Company's historical loss experience, conditioned as applicable on changes in current conditions and the reasonable and supportable economic forecast. Generally, given the nature of these loans, losses would be expected to manifest within a very short time period after origination.

The Company expects to collect the amortized cost basis of government insured residential loans due to the nature of the government guarantee, so the ACL is zero for these loans.

Qualitative factors

Quantitative models have certain inherent limitations with respect to estimating expected losses. These limitations may be more prevalent in times of rapidly changing or unprecedented economic conditions and forecasts. Qualitative adjustments are made to the ACL when, based on management’s judgment, there are factors impacting expected credit losses not taken into account by the quantitative calculations. Potential qualitative adjustments are categorized as follows:

•Economic factors, including material uncertainties, trends and developments that, in management's judgment, may not have been considered in the reasonable and supportable economic forecast;

•Credit policy and staffing, including the nature and level of policy and procedural exceptions or changes in credit policy not reflected in quantitative results, changes in the quality of underwriting and portfolio management and staff and issues identified by credit review, internal audit or regulators that may not be reflected in quantitative results;

•Concentrations, considering whether the quantitative estimate adequately accounts for concentration risk in the portfolio;

•Model imprecision and model validation findings; and

•Other factors not adequately considered in the quantitative estimate or other qualitative categories identified by management that may materially impact the amount of expected credit losses.

Collateral dependent loans

Collateral dependent loans are those for which the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the operation or sale of the collateral. These loans do not typically share similar risk characteristics with other loans and expected credit losses are evaluated on an individual basis. Loans evaluated individually are not included in the collective evaluation. Estimates of expected credit losses for collateral dependent loans, whether or not foreclosure is probable, are based on the fair value of the collateral, adjusted for selling costs when repayment depends on sale of the collateral. Due to immateriality, expected credit losses for collateral dependent commercial relationships with committed balances less than $1.0 million may be estimated collectively.

Off-balance sheet credit exposures

Expected credit losses related to off-balance sheet credit exposures are estimated over the contractual period for which the Company is exposed to credit risk via a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the Company. Expected credit losses are estimated using essentially the same methodologies employed to estimate expected credit losses on the amortized cost basis of loans, taking into consideration the likelihood and amount of additional amounts expected to be funded over the terms of the commitments. The liability for credit losses on off-balance sheet credit exposures is presented within other liabilities on the consolidated balance sheets, distinct from the ACL. Adjustments to the liability are included in the provision for credit losses.

Prior to the adoption of ASU 2022-02 on January 1, 2023

For TDRs or loans for which there was a reasonable expectation that a TDR would be executed that were not collateral dependent, the credit loss estimate was determined by comparing the net present value of expected cash flows to the amortized cost basis of the loans. Expected cash flows were discounted at the loans' original effective interest rate for fixed rate loans and at the rate as it changed over the life of the loans for variable rate loans.

Accrued Interest Receivable

The Company has elected to present accrued interest receivable separate from the amortized cost basis of financial assets carried at amortized cost. The Company excludes accrued interest receivable balances from tabular disclosures about financial assets carried at amortized cost. The Company generally does not estimate an ACL on accrued interest receivable balances since uncollectible accrued interest is timely written off in accordance with the Company's accounting policies for non-accrual loans. Under unusual circumstances, the Company evaluates whether its non-accrual policies continue to consistently provide for timely reversal of accrued interest receivable. If considered necessary, the Company records an allowance for uncollectible accrued interest receivable, determined using essentially the same methodologies used to estimate the ACL on the amortized cost basis of the related loans. The allowance is deducted from accrued interest receivable and presented within other assets on the consolidated balance sheets, distinct from the ACL. Changes in the ACL related to accrued interest receivable are included in the provision for credit losses.

Leases

The Company determines whether a contract is or contains a lease at inception. For leases with terms greater than twelve months under which the Company is lessee, ROU assets and lease liabilities are recorded at the commencement date. Lease liabilities are initially recorded based on the present value of future lease payments over the lease term. ROU assets are initially recorded at the amount of the associated lease liabilities plus prepaid lease payments and initial direct costs, less any lease incentives received. The cost of short term leases is recognized on a straight line basis over the lease term. The lease term includes options to extend if the exercise of those options is reasonably certain and includes termination options if there is reasonable certainty the options will not be exercised. Lease payments are discounted using the Company's FHLB borrowing rate for borrowings of a similar term unless an implicit rate is defined in the contract or is determinable, which is generally not the case. Leases are classified as financing or operating leases at commencement; generally, leases are classified as finance leases when effective control of the underlying asset is transferred. The substantial majority of leases under which the Company is lessee are classified as operating leases. For operating leases, lease cost is recognized in the consolidated statements of income on a straight line basis over the lease terms. For finance leases, interest expense on lease liabilities is recognized on the effective interest method and amortization of ROU assets is recognized on a straight line basis over the lease terms. Variable lease costs are recognized in the period in which the obligation for those costs is incurred. The Company has elected not to separate lease from non-lease components of its lease contracts.

Bank Owned Life Insurance

Bank owned life insurance is carried at cash surrender value. Changes in cash surrender value are recorded in non-interest income.

Operating Lease Equipment

Operating lease equipment is carried at cost less accumulated depreciation and is depreciated to estimated residual value using the straight-line method over the lease term. Estimated residual values are re-evaluated at least annually, based primarily on current residual value appraisals. Equipment held for sale is carried at the lower of carrying amount or estimated fair value less costs to sell and is included in other assets in the accompanying consolidated balance sheets. Rental revenue is recognized on a straight-line basis over the contractual term of the lease.

A review for impairment of equipment under operating lease is performed at least annually or when events or changes in circumstances indicate that the carrying amount of long-lived assets may not be recoverable. Impairment of assets is determined by comparing the carrying amount to future undiscounted net cash flows expected to be generated. If an asset is impaired, the measure of impairment is the amount by which the carrying amount exceeds the fair value of the asset.

Goodwill

Goodwill represents the excess of consideration transferred in business combinations over the fair value of net tangible and identifiable intangible assets acquired. Goodwill is not amortized, but is tested for impairment annually or more frequently if events or circumstances indicate that impairment may have occurred. The Company typically performs its annual goodwill impairment test in the third fiscal quarter. The Company has a single reporting unit.

When assessing goodwill for impairment, the Company may elect to perform a qualitative assessment to determine if a quantitative impairment test is necessary. If a qualitative assessment is not performed, or if the qualitative assessment indicates it is likely that the fair value of a reporting unit is less than its carrying amount, a quantitative test is performed. The quantitative impairment test compares the estimated fair value of the reporting unit to its carrying amount. If the fair value of the reporting unit exceeds its carrying amount, no impairment is indicated. If the fair value of the reporting unit is less than its carrying amount, impairment of goodwill is measured as the excess of the carrying amount over fair value.

OREO and Repossessed Assets

OREO and repossessed assets consists of real estate assets acquired through, or in lieu of, loan foreclosure and personal property acquired through repossession. Such assets are included in other assets in the accompanying consolidated balance sheets. These assets are held for sale and are initially recorded at estimated fair value less costs to sell, establishing a new cost basis. Subsequent to acquisition, periodic valuations are performed, and the assets are carried at the lower of the carrying amount at the date of acquisition or estimated fair value less cost to sell. Significant property improvements are capitalized to the extent that the resulting carrying value does not exceed fair value less cost to sell. Legal fees, maintenance, taxes, insurance and other direct costs of holding and maintaining these assets are expensed as incurred.

Premises and Equipment

Premises and equipment are carried at cost less accumulated depreciation and amortization and are included in other assets in the accompanying consolidated balance sheets. The Company measures assets held for sale at the lower of carrying amount or estimated fair value. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets. The lives of improvements to existing buildings are based on the lesser of the estimated remaining lives of the buildings or the estimated useful lives of the improvements. Leasehold improvements are amortized over the shorter of the expected terms of the leases at inception, considering options to extend that are reasonably assured, or their useful lives. The estimated useful lives of premises and equipment are as follows:

•buildings and improvements -10 to 30 years;

•leasehold improvements -3 to 20 years;

•aircraft and automobiles -5 to 15 years;

•furniture, fixtures and equipment -5 to 7 years; and

•computer equipment -3 to 5 years.

Software

Capitalized software, stated at cost less accumulated depreciation and amortization, includes CCA and capitalizable implementation costs associated with hosting arrangements. Capitalized software is included in other assets in the accompanying consolidated balance sheets. Depreciation and amortization are calculated using the straight-line method over the estimated useful lives of the assets, which for CCA is based on the term of the associated hosting arrangements plus any reasonably certain renewals. Direct costs associated with developing or obtaining and implementing internal use software and hosting arrangements that are service contracts incurred during the application development stage are capitalized. The estimated useful lives of software, software licensing rights and CCA implementation costs range from 3 to 5 years.

Investments in Affordable Housing Limited Partnerships

The Company has acquired investments in limited partnerships that manage or invest in qualified affordable housing projects andprovide the Company with low-income housing tax credits and other tax benefits. These investments are included in other assets in the accompanying consolidated balance sheets. The Company accounts for investments in qualified affordable housing projects using the proportional amortization method if certain criteria are met. Under the proportional amortization method, the initial cost of the investment is amortized in proportion to the tax credits and other tax benefits received and the amortization is recognized in the income statement as a component of income tax expense. The investments are evaluated for impairment when events or changes in circumstances indicate that it may be more likely than not that the carrying amount of the investment will not be realized.

Income Taxes

The Company accounts for income taxes using the asset and liability method. Deferred tax assets and liabilities are determined based on differences between the financial reporting and tax bases of assets and liabilities using enacted tax rates in effect for periods in which the differences are expected to reverse. The effect of changes in tax rates on deferred tax assets and liabilities are recognized in income in the period that includes the enactment date. A valuation allowance is established for deferred tax assets when management determines that it is more likely than not that some portion or all of a deferred tax asset will not be realized. In making such determinations, the Company considers all available positive and negative evidence that may impact the realization of deferred tax assets. These considerations include the amount of taxable income generated in statutory carryback periods, future reversals of existing taxable temporary differences, projected future taxable income and available tax planning strategies.

The Company recognizes tax benefits from uncertain tax positions when it is more likely than not that the related tax positions will be sustained upon examination, including resolutions of any related appeals or litigation processes, based on the technical merits of the tax positions. An uncertain tax position is a position taken in a previously filed tax return or a position expected to be taken in a future tax return that is not based on clear and unambiguous tax law. The Company measures tax benefits related to uncertain tax positions based on the largest benefit that has a greater than 50% likelihood of being realized upon settlement. If the initial assessment fails to result in recognition of a tax benefit, the Company subsequently recognizes a tax benefit if: (i) there are changes in tax law or case law that raise the likelihood of prevailing on the technical merits of the position to more-likely-than-not, (ii) the statute of limitations expires, or (iii) there is a completion of an examination resulting in a settlement of that tax year or position with the appropriate agency. The Company recognizes interest and penalties related to uncertain tax positions, as well as interest income or expense related to tax settlements, in the provision for income taxes.

Equity Based Compensation

The Company periodically grants unvested or restricted shares of common stock and other share-based awards to key employees. For equity classified awards, compensation cost is measured based on the estimated fair value of the awards at the grant date and is recognized in earnings on a straight-line basis over the requisite service period for each award. Liability-classified awards are remeasured each reporting period at fair value until the award is settled, and compensation cost is recognized in earnings on a straight-line basis over the requisite service period for each award, adjusted for changes in fair value each reporting period. Compensation cost related to awards that embody performance conditions is recognized when it is probable that the performance conditions will be achieved. The number of awards expected to vest is estimated in determining the amount of compensation cost to be recognized related to share-based payment transactions.

The fair value of unvested shares is generally based on the closing market price of the Company's common stock at the date of grant. Market conditions embedded in awards are reflected in the grant-date fair value of the awards.

Derivative Financial Instruments and Hedging Activities

Interest rate derivative contracts

The Company uses interest rate derivative contracts, such as swaps, caps, floors and collars, in the normal course of business to meet the financial needs of its customers and to manage exposure to changes in interest rates. Interest rate contracts are recorded as assets or liabilities in the consolidated balance sheets at fair value. Interest rate derivatives that are used as a risk management tool to hedge the Company's exposure to changes in interest rates have been designated as cash flow or fair value hedging instruments. The gain or loss resulting from changes in the fair value of interest rate derivatives designated and qualifying as cash flow hedging instruments is initially reported as a component of other comprehensive income and subsequently reclassified into earnings in the same period in which the hedged transaction affects earnings. Changes in the fair value of interest rate derivatives designated as fair value hedging instruments as well as the offsetting changes in the fair value of the hedged items caused by fluctuations in the designated benchmark interest rates are recognized in earnings.

The Company discontinues hedge accounting prospectively when it is determined that the derivative is no longer effective in offsetting changes in the cash flows or fair value of the hedged item, the derivative expires or is sold, terminated, or exercised, management determines that the designation of the derivative as a hedging instrument is no longer appropriate or, for a cash flow hedge, the occurrence of the forecasted transaction is no longer probable. When hedge accounting on a cash flow hedge is discontinued, any subsequent changes in fair value of the derivative are recognized in earnings. The cumulative unrealized gain or loss related to a discontinued cash flow hedge continues to be reported in AOCI and is subsequently reclassified into earnings in the same period in which the hedged transaction affects earnings, unless it is probable that the forecasted transaction will not occur by the end of the originally specified time period, in which case the cumulative unrealized gain or loss reported in AOCI is reclassified into earnings immediately. When hedge accounting on a fair value hedge is discontinued, adjustments to the carrying amount of the hedged item due to changes in fair value are also discontinued.

Cash flows from derivative financial instruments that are accounted for as hedges, including daily settlements of centrally cleared derivatives with the CME, are classified as operating cash flows.

Changes in the fair value of interest rate contracts not designated as, or not qualifying as, hedging instruments are recognized currently in earnings.

Transfers of Financial Assets

Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. A gain or loss is recognized in earnings upon completion of the sale based on the difference between the sales proceeds and the carrying value of the assets. Control over the transferred assets is deemed to have been surrendered when: (i) the assets have been legally isolated from the Company, (ii) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (iii) the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity or the ability to unilaterally cause the holder to return specific assets.

Earnings per Common Share

Basic earnings per common share is calculated by dividing income allocated to common stockholders for basic earnings per common share by the weighted average number of common shares outstanding for the period, reduced by average unvested stock awards. Unvested stock awards with non-forfeitable rights to dividends, whether paid or unpaid, are considered participating securities and are included in the computation of basic earnings per common share using the two class method whereby net income is allocated between common stock and participating securities. In periods of a net loss, no allocation is made to participating securities as they are not contractually required to fund net losses. Diluted earnings per common share is computed by dividing income allocated to common stockholders for basic earnings per common share, adjusted for earnings reallocated from participating securities, by the weighted average number of common shares outstanding for the period increased for the dilutive effect of unexercised stock options and unvested stock awards using the treasury stock method. Contingently issuable shares are included in the calculation of earnings per common share beginning on the date the contingency was resolved.

Revenue From Contracts with Customers

Revenue from contracts with customers within the scope of Topic 606 "Revenue from Contracts with Customers", is recognized in an amount that reflects the consideration the Company expects to be entitled to receive in exchange for those goods or services as the related performance obligations are satisfied. The majority of our revenues, including revenues from loans, leases, investment securities, derivative instruments and letters of credit and from transfers and servicing of financial assets, are excluded from the scope of Topic 606. Deposit service charges and fees is the most significant category of revenue within the scope of the standard. These service charges and fees consist primarily of monthly maintenance fees and other transaction based fees. Revenue is recognized when our performance obligations are complete, generally monthly for account maintenance fees or when a transaction, such as a wire transfer, is completed. Payment is typically received at the time the performance obligation is satisfied. The aggregate amount of revenue that is within the scope of Topic 606 from sources other than deposit service charges and fees is not material.

Reclassifications

Certain amounts presented for prior periods have been reclassified to conform to the current period presented.

New Accounting Pronouncements Adopted in 2023

ASU No. 2022-02—Financial Instruments—Credit Losses (Topic 326). This ASU eliminated the accounting guidance for TDRs by creditors in Subtopic 310-40, Receivables - Troubled Debt Restructurings by Creditors. The ASU enhanced disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty in the form of an interest rate reduction, an other-than-insignificant payment delay, a term extension, principal forgiveness or a combination thereof. The ASU also updated certain requirements related to accounting for credit losses under ASC 326 and required disclosure of current-period gross charge-offs of financing receivables by year of origination. The Company adopted this ASU in the first quarter of 2023, prospectively, except with respect to the recognition and measurement of TDRs, for which the modified retrospective transition method was applied. The Company recorded a reduction to the ACL of $1.8 million and a cumulative-effect adjustment, net of tax, to retained earnings of $1.3 million on January 1, 2023. Additional and modified disclosures required by this ASU are included in the Notes to these Consolidated Financial Statements.

Accounting Pronouncements Not Yet Adopted

ASU No. 2023-02—Investments - Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures using the Proportional Amortization Method (A Consensus of the Emerging Issues Task Force). This ASU was issued to expand use of the proportional amortization method of accounting to equity investments in tax credit programs beyond those in LIHTC programs. The ASU allows entities to elect the proportional amortization method, on a tax-credit-program-by-tax-credit-program basis, for all equity investments in tax credit programs meeting the eligibility criteria established. This ASU is effective for the Company for interim and annual periods in fiscal years beginning after December 15, 2023. The Company will adopt this ASU during the first quarter of 2024 and expects no material impact on the Company's consolidated financial position, results of operations, and cash flows. Currently, all of the Company's equity investments in tax credit programs are in LIHTC programs accounted for using the proportional amortization method.

ASU No. 2023-07—Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. This ASU augments reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. In addition, the amendments enhance interim disclosure requirements, clarify circumstances in which an entity can disclose multiple segment measures of profit or loss, provide new segment disclosure requirements for entities with a single reportable segment, and contains other disclosure requirements. This ASU is effective for the Company for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. This ASU will have no impact on the Company's consolidated financial position, results of operations, and cash flows. Adoption may lead to additional and revised disclosures in the Company's financial statements starting in the quarter of adoption.

ASU No. 2023-09—Income Taxes (Topic 740): Improvements to Income Tax Disclosures. This ASU requires entities to provide more information in the annual and interim income tax disclosures, primarily related to the income tax rate reconciliation and income taxes paid. The guidance also eliminates certain existing disclosure requirements related to uncertain tax positions and unrecognized deferred tax liabilities. This ASU is effective for the Company for fiscal years beginning after December 15, 2024, and interim periods within fiscal years beginning after December 15, 2025. The impact of adoption of this

ASU on the Company's consolidated financial position, results of operations, and cash flows is not expected to be material. Adoption will lead to additional and revised disclosures in the Company's financial statements starting in the quarter of adoption.

Note 2 Earnings Per Common Share

The computation of basic and diluted earnings per common share is presented below for the periods indicated (in thousands, except share and per share data):

Potentially dilutive unvested shares totaling 1,738,534,2,034,960 and 1,804,973 were outstanding at December 31, 2023, 2022 and 2021, respectively, but excluded from the calculation of diluted earnings per common share because their inclusion would have been anti-dilutive.

Note 3 Investment Securities

Investment securities include investment securities available for sale, marketable equity securities, and investment securities held to maturity. The investment securities portfolio consisted of the following at the dates indicated (in thousands):

(1)At fair value except for securities held to maturity.

Investment securities held to maturity at December 31, 2023 and 2022, consisted ofone State of Israel bond maturing in October 2024. Accrued interest receivable on investments totaled $37 million and $34 million at December 31, 2023 and 2022, respectively, and is included in other assets in the accompanying consolidated balance sheets.

At December 31, 2023, contractual maturities of investment securities available for sale, adjusted for anticipated prepayments when applicable, were as follows (in thousands):

The carrying value of securities pledged as collateral for FHLB advances, public deposits, interest rate swaps and to secure borrowing capacity at the FRB totaled $7.7 billion and $4.1 billion at December 31, 2023 and 2022, respectively.

The following table provides information about gains and losses on investment securities for the periods indicated (in thousands):

The following tables present the aggregate fair value and the aggregate amount by which amortized cost exceeded fair value for investment securities available for sale in unrealized loss positions aggregated by investment category and length of time that individual securities had been in continuous unrealized loss positions at the dates indicated (in thousands):

The Company monitors its investment securities available for sale for credit loss impairment on an individual security basis. No securities were determined to be credit loss impaired during the years ended December 31, 2023, 2022 and 2021. At December 31, 2023, the Company did not have an intent to sell securities that were in unrealized loss positions, and it was not more likely than not that the Company would be required to sell these securities before recovery of the amortized cost basis, which may be at maturity. In making this determination, the Company considered its current and projected liquidity position including its ability to pledge securities to generate liquidity, its investment policy as to permissible holdings and concentration limits, regulatory requirements and other relevant factors. While events of early 2023 impacting the banking sector impacted the liquidity profile of many banks, including BankUnited, the substantial majority of our investment securities are pledgeable at either the FHLB or FRB. We have not sold, and do not anticipate the need to sell, securities in unrealized loss positions to generate liquidity.

At December 31, 2023,558 securities available for sale were in unrealized loss positions. The amount of impairment related to 114 of these securities was considered insignificant both individually and in the aggregate, totaling approximately $1.1 million and no further analysis with respect to these securities was considered necessary.

The basis for concluding that AFS securities were not credit loss impaired and no ACL was considered necessary at December 31, 2023, is further discussed below.

Unrealized losses were primarily attributable to a sustained higher interest rate environment. In some cases, wider spreads compared to levels at which securities were purchased. market volatility and yield curve dislocations also contributed to unrealized losses, particularly in the CLO segment. The investment securities AFS portfolio was in a net unrealized loss position of $534.8 million at December 31, 2023, compared to $674.2 million at December 31, 2022, improving by $139.4 million during the year ended December 31, 2023. While the majority of securities in the portfolio were floating rate at December 31, 2023, fixed rate securities accounted for the majority of unrealized losses.

U.S. Government, U.S. Government Agency and Government Sponsored Enterprise Securities

At December 31, 2023, six U.S. treasury,130 U.S. Government agency and sponsored enterprise residential MBS,26 U.S. Government agency and sponsored enterprise commercial MBS, and 22 SBA securities were in unrealized loss positions. The timely payment of principal and interest on these securities is explicitly or implicitly guaranteed by the U.S. Government. As such, there is an assumption of zero credit loss and the Company expects to recover the amortized cost basis of these securities.

Private Label Securities:

None of the impaired private label securities had missed principal or interest payments or had been downgraded by a NRSRO at December 31, 2023. The Company performed an analysis comparing the present value of cash flows expected to be collected to the amortized cost basis of impaired securities. This analysis was based on a scenario that we believe to be generally more conservative than our reasonable and supportable economic forecast at December 31, 2023, and incorporated assumptions about voluntary prepayment rates, collateral defaults, delinquencies, severity and other relevant factors as described further below. Our analysis also considered the structural characteristics of each security and the level of credit enhancement provided by that structure.

Private label residential MBS and CMOs

At December 31, 2023,114 private label residential MBS and CMOs were in unrealized loss positions. Our analysis of cash flows expected to be collected on these securities incorporated assumptions about collateral default rates, voluntary prepayment rates, loss severity, delinquencies and recovery lag. In developing those assumptions, we took into account collateral quality measures such as FICO, LTV, documentation, loan type, property type, agency availability criteria and performing status. We also regularly monitor sector data including home price appreciation, forbearance, delinquency, special servicing and prepay trends as well as other economic data that could be indicative of stress in the sector. Underlying delinquencies in this sector remain low. Our December 31, 2023 analysis projected weighted average collateral losses for impaired securities in this category of 2% compared to weighted average credit support of 18%. As of December 31, 2023,95% of impaired securities in this category, based on carrying value, were externally rated AAA,4% were rated AA and 1% were rated A.

Private label commercial MBS

At December 31, 2023,95 private label commercial MBS were in unrealized loss positions. Our analysis of cash flows expected to be collected on these securities incorporated assumptions about collateral default rates, voluntary prepayment rates, loss severity, delinquencies and recovery lag. In developing those assumptions, we took into account collateral quality and type, loan size, loan purpose and other qualitative factors. We also regularly monitor collateral concentrations, collateral watch lists, bankruptcy data, defeasance data, special servicing trends, delinquency and other economic data that could be indicative of stress in the sector. We consider collateral, deal, sector and tranche level performance as well as maturity and refinance risk. While we have observed some deterioration in collateral performance in this segment, particularly in the office, retail and hospitality sectors, the high credit quality of these securities and adequacy of subordination to cover projected collateral losses supports the conclusion that there is no credit loss impairment. Our December 31, 2023 analysis projected weighted average collateral losses for impaired securities in this category of 7% compared to weighted average credit support of 43%. As of December 31, 2023,85% of impaired securities in this category, based on carrying value, were externally rated AAA,11% were rated AA and 4% were rated A.

Single family real estate-backed securities

At December 31, 2023,13 single family rental real estate-backed securities were in unrealized loss positions. Our analysis of cash flows expected to be collected on these securities incorporated assumptions about collateral default rates, loss severity, delinquencies and recovery lag. We regularly monitor sector data including home price appreciation, forbearance, delinquency and prepay trends as well as other economic data that could be indicative of stress in the sector. We consider collateral, deal, sector and tranche level performance as well as maturity and refinance risk. Our December 31, 2023 analysis projected weighted average collateral losses for this category of 8% compared to weighted average credit support of 53%. As of December 31, 2023,57% of impaired securities in this category, based on carrying value, were externally rated AAA,17% were rated AA andone security was not externally rated.

Collateralized loan obligations

At December 31, 2023,28 collateralized loan obligations were in unrealized loss positions. Unrealized losses totaled less than 1% of total amortized cost of this segment at December 31, 2023. Our analysis of cash flows expected to be collected on these securities incorporated assumptions about collateral default rates, loss severity, and delinquencies, calibrated to take into account idiosyncratic risks associated with the underlying collateral. In developing those assumptions, we took into account each sector’s performance pre-, during and post the 2008 financial crisis. We regularly engage with bond managers to monitor trends in underlying collateral including potential downgrades and subsequent cash flow diversions, liquidity, ratings migration, and any other relevant developments. While we have observed some deterioration in underlying collateral performance due in large part to rising costs, the high credit quality of these securities and adequacy of subordination to cover projected collateral losses supports the conclusion that there is no credit loss impairment. Our December 31, 2023 analysis projected weighted average collateral losses for impaired securities in this category of 15% compared to weighted average credit support of 45%. As of December 31, 2023,81% of the impaired securities in this category, based on carrying value, were externally rated AAA,15% were rated AA and 4% were rated A.

Non-mortgage asset-backed securities

At December 31, 2023, six non-mortgage asset-backed securities were in unrealized loss positions. These securities are backed by student loan collateral. Our analysis of cash flows expected to be collected on these securities incorporated assumptions about collateral default rates, loss severity, delinquencies, voluntary prepayment rates and recovery lag. In developing assumptions, we took into account collateral type, delineated by whether collateral consisted of loans to borrowers in school, refinancing, or a mixture. Our December 31, 2023 analysis projected weighted average collateral losses for impaired securities in this category of 4% compared to weighted average credit support of 24%. As of December 31, 2023,38% of the impaired securities in this category, based on carrying value, were externally rated AAA, and 62% were rated AA.

State and Municipal Obligations

At December 31, 2023, four state and municipal obligations were in unrealized loss positions. Our analysis of potential credit loss impairment for these securities incorporates a quantitative measure of the underlying obligor's credit worthiness provided by a third-party vendor as well as other relevant qualitative considerations. As of December 31, 2023,98% of the impaired securities in this category, based on carrying value, were externally rated AAA and 2% were rated AA.

Note 4 Loans and Allowance for Credit Losses

Loans consisted of the following at the dates indicated (dollars in thousands):

Premiums, discounts and deferred fees and costs, excluding the non-credit related discount on PCD loans, totaled $45 million and $61 million at December 31, 2023 and 2022, respectively.

The following table presents the amortized cost basis of residential PCD loans and the related amount of non-credit discount, net of the related ACL, at the dates indicated (in thousands):

During the years ended December 31, 2023, 2022 and 2021, the Company purchased residential loans totaling $493 million, $2.3 billion and $4.8 billion, respectively.

At December 31, 2023 and 2022, the Company had pledged loans with a carrying value of approximately $16.5 billion and $12.4 billion, respectively, as security for FHLB advances and Federal Reserve discount window capacity.

At December 31, 2023 and 2022, accrued interest receivable on loans totaled $138 million and $129 million, respectively, and is included in other assets in the accompanying consolidated balance sheets. The amount of interest income reversed on non-accrual loans was not material for the years ended December 31, 2023, 2022 and 2021.

Allowance for credit losses

The ACL was determined utilizing a 2-year reasonable and supportable forecast period. The quantitative portion of the ACL at December 31, 2023, was determined using three weighted third-party provided economic scenarios. The quantitative portion of the ACL at December 31, 2022 and 2021 was determined using a single third-party provided economic scenario. Activity in the ACL is summarized below for the periods indicated (in thousands):

The ACL increased by $54.7 million, from 0.59% to 0.82% of total loans, at December 31, 2023, compared to December 31, 2022. The more significant factors impacting the provision for credit losses and increase in the ACL for the year ended December 31, 2023, included changes in the economic forecast, new commercial loan production, risk rating migration and an increase in certain specific reserves.

The following table presents gross charge-offs during the year ended December 31, 2023, by year of origination (in thousands):

The following table presents the components of the provision for (recovery of) credit losses for the periods indicated (in thousands):

Credit quality information

Credit quality of loans held for investment is continuously monitored by dedicated residential credit risk management and commercial portfolio management functions. The Company also has a workout and recovery department that monitors the credit quality of criticized and classified loans and an independent internal credit review function.

Credit quality indicators for residential loans

Management considers delinquency status to be the most meaningful indicator of the credit quality of residential loans, other than government insured residential loans. Delinquency statistics are updated at least monthly. LTV and FICO scores are also important indicators of credit quality for 1-4 single family residential loans other than government insured loans. FICO scores are generally updated semi-annually, and were most recently updated in the third quarter of 2023. LTVs are typically at origination since we do not routinely update residential appraisals. Substantially all of the government insured residential loans are government insured buyout loans, which the Company buys out of GNMA securitizations upon default. For these loans, traditional measures of credit quality are not particularly relevant considering the guaranteed nature of the loans and the underlying business model. Factors that impact risk inherent in the residential portfolio segment include national and regional economic conditions such as levels of unemployment, wages and interest rates, as well as residential property values.

1-4 Single Family Residential credit exposure, excluding government insured residential loans, based on delinquency status (in thousands):

1-4 Single Family Residential credit exposure, excluding government insured residential loans, based on LTV (in thousands):

1-4 Single Family Residential credit exposure, excluding government insured residential loans, based on FICO score (in thousands):

Credit quality indicators for commercial loans

Factors that impact risk inherent in commercial portfolio segments include but are not limited to levels of economic activity or potential disruptions in economic activity, health of the national, regional and to a lesser extent global economy, interest rates, industry trends, demographic trends, inflationary trends, including particularly for commercial real estate loans the cost of insurance, patterns of and trends in customer behavior that influence demand for our borrowers' products and services, and commercial real estate values and related market dynamics. Particularly for the office sector, the evolving impact of hybrid and remote work on vacancies and valuations is a factor. Internal risk ratings are considered the most meaningful indicator of credit quality for commercial loans. Internal risk ratings are generally indicative of the likelihood that a borrower will default, are a key factor influencing the level and nature of ongoing monitoring of loans and may impact the estimation of the ACL. Internal risk ratings are updated on a continuous basis. Generally, relationships with balances in excess of defined thresholds, ranging from $1 million to $3 million, are re-evaluated at least annually and more frequently if circumstances indicate that a change in risk rating may be warranted. The special mention rating is considered a transitional rating for loans exhibiting potential credit weaknesses that could result in deterioration of repayment prospects at some future date if not checked or corrected and that deserve management’s close attention. These borrowers may exhibit declining cash flows or revenues or increasing leverage. Loans with well-defined credit weaknesses that may result in a loss if the deficiencies are not corrected are assigned a risk rating of substandard. These borrowers may exhibit payment defaults, inadequate cash flows from current operations, operating losses, increasing balance sheet leverage, project cost overruns, unreasonable construction delays, exhausted interest reserves, declining collateral values, frequent overdrafts or past due real estate taxes. Loans with weaknesses so severe that collection in full is highly questionable or improbable, but because of certain reasonably specific pending factors have not been charged off, are assigned an internal risk rating of doubtful.

Commercial credit exposure based on internal risk rating (in thousands):

At December 31, 2023 and 2022, the balance of revolving loans converted to term loans was immaterial.

The following table presents criticized and classified commercial loans, in aggregate by risk rating category, at the dates indicated (in thousands):

Past Due and Non-Accrual Loans:

The following table presents an aging of loans at the dates indicated (in thousands):

Included in the table above is the guaranteed portion of SBA loans past due by 90 days or more totaling $39.7 million and $30.8 million at December 31, 2023 and 2022, respectively.

Loans contractually delinquent by 90 days or more and still accruing totaled $278 million and $494 million at December 31, 2023 and 2022, respectively, substantially all of which were government insured residential loans. These loans are government insured pool buyout loans, which the Company buys out of GNMA securitizations upon default.

The following table presents information about loans on non-accrual status at the dates indicated (in thousands):

Included in the table above is the guaranteed portion of non-accrual SBA loans totaling $41.8 million and $40.3 million at December 31, 2023 and 2022, respectively. The amount of interest income recognized on non-accrual loans was insignificant for the years ended December 31, 2023, 2022 and 2021. The amount of additional interest income that would have been recognized on non-accrual loans had they performed in accordance with their contractual terms was approximately $7.7 million, $5.9 million and $8.0 million for the years ended December 31, 2023, 2022 and 2021, respectively.

Collateral dependent loans:

The following table presents the amortized cost basis of collateral dependent loans at the dates indicated (in thousands):

Collateral for the CRE loan class generally consists of commercial real estate, or for certain construction loans, residential real estate. Collateral for C&I loans generally consists of equipment, accounts receivable, inventory and other business assets and for owner-occupied commercial real estate loans, may also include commercial real estate. Franchise finance loans may be collateralized by franchise value or by equipment. Residential loans are collateralized by residential real estate. There were no significant changes to the extent to which collateral secured collateral dependent loans during the years ended December 31, 2023 and 2022.

Foreclosure of residential real estate

The recorded investment in residential loans in the process of foreclosure was $262 million, of which $250 million was government insured at December 31, 2023, and $413 million, of which $400 million was government insured at December 31, 2022. The carrying amount of foreclosed residential real estate included in other assets in the accompanying consolidated balance sheet was insignificant at December 31, 2023 and 2022.

Loan Modifications

The following tables summarize loans that were modified for borrowers experiencing financial difficulty, by type of modification, during the periods indicated (dollars in thousands):

(1)Represents percentage of loans receivable in each category.

The following tables summarize the financial effect of the modifications made to borrowers experiencing difficulty, during the periods indicated:

The following table presents the aging at December 31, 2023, of loans that were modified since January 1, 2023, the date of adoption of ASU 2022-02 (in thousands):

The following tables summarizes loans that were modified since January 1, 2023, the date of adoption of ASU 2022-02, and subsequently defaulted, during the periods indicated (in thousands):

Geographic Concentrations

The following table presents the five states with the largest geographic concentrations of 1-4 single family residential loans, excluding government insured residential loans, at the dates indicated (dollars in thousands):

The following table presents the largest geographic concentrations of commercial loansat the dates indicated. Commercial real estate loans are categorized based on the location of the underlying collateral, while all other commercial loans are generally categorized based on the location of the borrowers' businesses (dollars in thousands):

No state other than those detailed in the table represented more than 5% of either commercial real estate or other commercial loans at either date presented.

Disclosures Prescribed by Legacy GAAP (Before Adoption of ASU 2022-02) for Prior Periods

The following table summarizes loans that were modified in TDRs during the periods indicated, as well as loans modified during the twelve months preceding December 31, 2022 and 2021 that experienced payment defaults during the periods indicated (dollars in thousands):

TDRs during the years ended December 31, 2022 and 2021 generally included interest rate reductions and extensions of maturity. Included in TDRs are residential loans to borrowers who have not reaffirmed their debt discharged in Chapter 7 bankruptcy. The total amount of such loans is not material.

For the year ended December 31, 2021, certain loan modifications that otherwise may have been reported as TDRs and that were within the scope of the CARES Act and interagency regulatory guidance issued in response to the COVID-19 pandemic were not reported as TDRs.

Note 5 Leases

Leases under which the Company is the lessee

The Company leases branches, office space and a small amount of equipment under either operating or finance leases with remaining terms ranging from one to 12 years, some of which include extension options.

The following table presents ROU assets and lease liabilities at the dates indicated (in thousands):

ROU assets and lease liabilities for operating leases are included in "other assets" and "other liabilities", respectively, in the accompanying consolidated balance sheets. ROU assets and lease liabilities for finance leases are included in "other assets" and "notes and other borrowings", respectively.

The weighted average remaining lease term and weighted average discount rate at the dates indicated were:

The following table presents the components of lease expense for the periods indicated (in thousands):

Short-term lease costs were immaterial for the years ended December 31, 2023, 2022 and 2021.

The following table presents additional information related to operating and finance leases for the dates and periods indicated (in thousands):

Future lease payment obligations under leases with terms in excess of one year and a reconciliation to lease liabilities as of December 31, 2023 were as follows (in thousands):

Leases under which the Company is the lessor

Direct or Sales Type Financing Leases

The following table presents the components of the investment in direct or sales type financing leases, included in loans in the consolidated balance sheets at the dates indicated (in thousands):

At December 31, 2023, future minimum lease payments to be received under direct or sales type financing leases were as follows (in thousands):

Operating Lease Equipment

Operating lease equipment consists primarily of railcars, non-commercial aircraft and other transportation equipment leased to commercial end users. Original lease terms generally range from three to fifteen years. Asset risk is evaluated and managed by a dedicated internal staff of seasoned equipment finance professionals with a broad depth and breadth of experience in the leasing business. The Company has partnered with an industry leading, experienced service provider who provides fleet management and servicing relating to the railcar fleet. Residual risk is managed by setting appropriate residual values at inception and systematic reviews of residual values based on independent appraisals, performed at least annually.

The following table presents the components of operating lease equipment at the dates indicated (in thousands):

The Company did not recognize any impairment during the years ended December 31, 2023 and 2022. Impairment was recognized in the amount of $2.8 million during the year ended December 31, 2021. These impairment charges are included in "depreciation and impairment of operating lease equipment" in the accompanying consolidated statements of income.

At December 31, 2023, scheduled minimum rental payments under operating leases were as follows (in thousands):

The following table summarizes income recognized for operating and direct or sales type finance leases for the periods indicated (in thousands):

Note 6 Deposits

The following table presents average balances and weighted average rates paid on deposits for the periods indicated (dollars in thousands):

Time deposit accounts with balances greater than $250,000 totaled $941 million and $730 million at December 31, 2023 and 2022, respectively.

The following table presents maturities of time deposits as of December 31, 2023 (in thousands):

Included in deposits at December 31, 2023, are public funds deposits of $3.1 billion and brokered deposits of $5.3 billion. Investment securities AFS with a carrying value of $794 million and a FHLB letter of credit in the amount of $900 million, were pledged as security for public funds deposits at December 31, 2023.

Interest expense on deposits for the periods indicated was as follows (in thousands):

Certain of our depositors participate in various customer rebate programs. During the years ended December 31, 2023, 2022 and 2021, deposit costs related to these programs totaled $44.2 million, $15.4 million and $8.1 million, respectively. These expenses are included in "other non-interest expense" in the accompanying consolidated statements of income.

Note 7 Borrowings

The following table presents information about outstanding FHLB advances as of December 31, 2023 (dollars in thousands):

The table above reflects contractual maturities and rates of outstanding advances and does not incorporate the impact that interest rate derivatives have on the duration or cost of borrowings.

The terms of the Company's security agreement with the FHLB require a specific assignment of collateral consisting of qualifying first mortgage loans, commercial real estate loans and mortgage-backed securities with unpaid principal amounts discounted at various stipulated percentages at least equal to 100% of outstanding FHLB advances. As of December 31, 2023, the Company had pledged investment securities and real estate loans with an aggregate carrying amount of approximately $14.6 billion as collateral for advances and letters of credit from the FHLB.

Notes and other borrowings consisted of the following at the dates indicated (dollars in thousands):

The senior notes pay interest semiannually and have an effective interest rate of 5.12%, after consideration of issuance discount and costs. The notes may be redeemed by the Company, in whole or in part, at any time prior to August 17, 2025 at the greater of a) 100% of the principal balance or b) the sum of the present values of the remaining scheduled payments of principal and interest on the securities discounted to the redemption date at i) the rate on a United States Treasury security with a maturity comparable to the remaining maturity of the senior notes that would be used to price new issues of corporate debt securities with a maturity comparable to the remaining maturity of the senior notes plus ii) 40 basis points. The senior notes may be redeemed at any time after August 17, 2025 at 100% of principal plus accrued and unpaid interest.

The subordinated notes pay interest semiannually and have an effective interest rate of 5.39%, after consideration of issuance discount and costs. The notes may be redeemed by the Company, in whole or in part, on or after March 11, 2030 at a redemption price equal to 100% of the principal amount being redeemed plus accrued and unpaid interest, subject to the approval of the Federal Reserve. The notes qualify as Tier 2 capital for regulatory capital purposes, subject to applicable limitations.

At December 31, 2023, BankUnited had available borrowing capacity at the FHLB of approximately $4.6 billion and unused borrowing capacity at the FRB of approximately $7.4 billion.

Note 8 Premises, Equipment and Software

Premises and equipment and capitalized software costs are included in other assets in the accompanying consolidated balance sheets and are summarized as follows at the dates indicated (in thousands):

Depreciation and amortization expense related to premises, equipment and software was $18.7 million, $17.5 million and $16.7 million for the years ended December 31, 2023, 2022 and 2021, respectively.

Note 9 Income Taxes

The components of the provision for income taxes were as follows for the periods indicated (in thousands):

A reconciliation of expected income tax expense at the statutory federal income tax rate of 21% to the Company's effective income tax rate for the periods indicated follows (dollars in thousands):

During the year ended December 31, 2021, the Bank reached a settlement with the Florida Department of Revenue related to certain tax matters for the 2009-2019 tax years and recorded a tax benefit of $43.9 million, net of federal impact.

The components of deferred tax assets and liabilities were as follows at the dates indicated (in thousands):

Based on the evaluation of available evidence, the Company has concluded that it is more likely than not that the existing deferred tax assets will be realized. The primary factors supporting this conclusion are the Company's history of reported pre-tax income and the amount of future taxable income that will result from the scheduled reversal of existing deferred tax liabilities.

At December 31, 2023, remaining net operating loss and tax credit carryforwards included Florida net operating loss carryforwards in the amount of $108.6 million. Florida net operating loss carryforwards consisted of $90.9 million expiring from 2030 through 2037 and $17.7 million that can be carried forward indefinitely.

The Company has investments in affordable housing limited partnerships which generate federal Low Income Housing Tax Credits and other tax benefits. The balance of these investments, included in other assets in the accompanying consolidated balance sheet, was $111 million and $100 million at December 31, 2023 and 2022, respectively. Unfunded commitments for affordable housing investments, included in other liabilities in the accompanying consolidated balance sheet, were $77 million and $62 million at December 31, 2023 and 2022, respectively. The maximum exposure to loss as a result of the Company's involvement with these limited partnerships at December 31, 2023, was approximately $164 million. While the Company believes the likelihood of potential losses from these investments is remote, the maximum exposure was determined by assuming a scenario where the projects completely fail and do not meet certain government compliance requirements resulting in recapture of the related tax credits and full impairment of the remaining unamortized investment. These investments did not have a material impact on income tax expense for the years ended December 31, 2023, 2022 and 2021.

The Company has a liability for unrecognized tax benefits relating to uncertain federal and state tax positions in several jurisdictions. A reconciliation of the beginning and ending amount of gross unrecognized tax benefits at the dates indicated follows (in thousands):

As of December 31, 2023, 2022 and 2021, the Company had $343.8 million, $342.6 million and $329.3 million, respectively, of unrecognized federal and state tax benefits, net of federal tax benefits, that if recognized would have impacted the effective tax rate. Unrecognized tax benefits related to federal and state income tax contingencies that may decrease during the 12 months subsequent to December 31, 2023, as a result of settlements with taxing authorities range from zero to $334.7 million.

Interest and penalties related to unrecognized tax benefits are included in the provision for income taxes in the consolidated statements of income. At December 31, 2023 and 2022, accrued interest and penalties included in the consolidated balance sheets, net of federal tax benefits, were $26.4 million and $16.5 million, respectively. The total amount of interest and penalties, net of federal tax benefits, recognized through income tax expense was $10.0 million, $5.9 million and $(5.7) million during the years ended December 31, 2023, 2022 and 2021, respectively.

The Company and its subsidiaries file a consolidated federal income tax return as well as combined state income tax returns where combined filings are required. The federal tax returns for years 2018 through 2022, remain subject to examination in the U.S. Federal jurisdiction. State tax returns for years 2018 through 2022, remain subject to examination by certain states.

Note 10 Derivative Financial Instruments

Derivatives designated as hedging instruments

The Company has entered into interest rate swaps, caps and collars designated as cash flow hedges with the objective of limiting the variability of interest payment cash flows. The Company has also entered into interest rate swaps designated as fair value hedges designed to hedge changes in the fair value of outstanding fixed rate instruments caused by fluctuations in the benchmark interest rate. Changes in fair value of derivative instruments designated as cash flow hedges are reported in accumulated other comprehensive income. Changes in the fair value of derivative instruments designated as fair value hedges are recognized in earnings, as is the offsetting gain or loss on the hedged item.

The following table summarizes the Company's derivatives designated as hedging instruments as of the dates indicated (in thousands):

(1) The fair values of derivatives are included in other assets or other liabilities in the consolidated balance sheets.

Derivatives designated as cash flow hedges

The following table provides information about the amount of gain (loss) related to derivatives designated as cash flow hedges reclassified from AOCI into interest income or expense for the periods indicated (in thousands):

During the years ended December 31, 2023 and 2022, no derivative positions designated as cash flow hedges were discontinued and none of the gains and losses reported in AOCI were reclassified into earnings as a result of the discontinuance of cash flow hedges or because of the early extinguishment of debt. During the year ended December 31, 2021, derivative positions designated as cash flow hedges with a notional amount totaling $401 million were discontinued following the Company's determination that the hedged forecasted transactions were not probable of occurring. A loss of $33.4 million, net of tax, was reclassified from AOCI into earnings as a result of the discontinuance of the cash flow hedges.

As of December 31, 2023, the amount of net gain expected to be reclassified from AOCI into earnings during the next twelve months was $38.4 million, based on the forward curve. See Note 11 to the consolidated financial statements for additional information about the reclassification adjustments from AOCI into earnings.

Derivatives designated as fair value hedges

The amount of gain (loss) related to derivatives designated as fair value hedges recognized in earnings was insignificant for all applicable periods. The following table provides information about the hedged items related to derivatives designated as fair value hedges at the date indicated (in thousands):

(1)This amount is included in the amortized cost basis of a closed portfolio of loans used to designate hedging relationships in a portfolio layer method hedge in which the hedged item is anticipated to be outstanding for the designated hedge period. The amortized cost basis of the closed portfolio used in this hedging relationship was $992 million and $1 billion, respectively, at December 31, 2023 and 2022.

Derivatives not designated as hedging instruments

The Company enters into interest rate derivative contracts with certain of its commercial borrowers to enable those borrowers to manage their exposure to interest rate fluctuations. To mitigate interest rate risk associated with these derivative contracts, the Company enters into offsetting derivative contract positions with primary dealers. These interest rate derivative contracts are not designated as hedging instruments; therefore, changes in the fair value of these derivatives are recognized immediately in earnings. The impact on earnings related to changes in fair value of these derivatives was $8.7 million, $4.7 million, and $6.6 million for the years ended December 31, 2023, 2022 and 2021, respectively.

The Company may be exposed to credit risk in the event of non-performance by the counterparties to its interest rate derivative agreements. The Company assesses the credit risk of its financial institution counterparties by monitoring publicly available credit rating and financial information. The Company manages dealer credit risk by entering into interest rate derivatives only with primary and highly rated counterparties, the use of ISDA master agreements, central clearing mechanisms and counterparty limits. The agreements contain bilateral collateral arrangements with the amount of collateral to be posted generally governed by the settlement value of outstanding swaps. The Company manages the risk of default by its commercial borrower counterparties through its normal loan underwriting and credit monitoring policies and procedures. The Company does not currently anticipate any significant losses from failure of interest rate derivative counterparties to honor their obligations.

The following table summarizes the Company's derivatives not designated as hedging instruments as of the dates indicated (in thousands):

(1) Fair values of these derivatives are included in other assets and other liabilities in the consolidated balance sheets.

Some of the Company’s ISDA master agreements with financial institution counterparties contain provisions that permit either counterparty to terminate the agreements and require settlement in the event that regulatory capital ratios fall below certain designated thresholds, upon the initiation of other defined regulatory actions or upon suspension or withdrawal of the Bank’s credit rating. Currently, there are no circumstances that would trigger these provisions of the agreements.

Master netting agreements

The Company does not offset assets and liabilities under master netting agreements for financial reporting purposes. Information on interest rate swaps and caps subject to these agreements is as follows at the dates indicated (in thousands):

The difference between the amounts reported for interest rate swaps subject to master netting agreements and the total fair value of interest rate contract derivative financial instruments reported in the consolidated balance sheets is related to interest rate derivative contracts not subject to master netting agreements.

Risk Participation Agreements

The Company purchases and sells credit protection under RPAs with the objective of sharing with financial institution counterparties some of the credit exposure related to interest rate derivative contracts entered into with commercial borrowers related to participations purchased or sold. The Company will make or receive payments under these agreements if a customer defaults on an obligation to perform under certain interest rate derivative contracts. At December 31, 2023 and 2022, the notional amount of the RPAs was $363 million and $202 million, respectively. The fair value of these derivatives was not material at December 31, 2023 and 2022.

Note 11 Stockholders’ Equity

Accumulated Other Comprehensive Income

Changes in accumulated other comprehensive income are summarized as follows for the periods indicated (in thousands):

The categories of AOCI and changes therein are presented below for the periods indicated (in thousands):

Note 12 Equity Based and Other Compensation Plans

Description of Equity Based Compensation Plans

In 2023, the Board of Directors and the Company's stockholders approved the 2023 Plan. The number of shares initially authorized for grant under the 2023 Plan was 1,900,000 shares. Shares remaining under the 2014 Plan as of the effective date of the 2023 Plan were transferred to the 2023 Plan, and are also available for issuance under the 2023 Plan. Previously, awards were administered under the 2014 Plan or the 2010 Plan. The Plans are administered by the Board of Directors or a committee thereof and provide for the grant of non-qualified stock options, SARs, restricted shares, deferred shares, performance shares, unrestricted shares and other share-based awards to selected employees, directors or independent contractors of the Company and its affiliates. As of December 31, 2023, no further awards are available for issuance under the 2010 and 2014 plans although unvested awards issued under these Plans are still outstanding. The number of shares of common stock authorized for award under the 2023 Plan, including those transferred from the 2014 Plan, is 3,766,764, of which 2,472,999 shares remain available for issuance as of December 31, 2023. Shares of common stock delivered under the plans may consist of authorized but unissued shares or previously issued shares reacquired by the Company. Unvested awards become fully vested in the event of a change in control, subject to a double trigger, as defined.

Compensation Expense Related to Equity Based Awards

The following table summarizes compensation cost related to equity based awards for the periods indicated (in thousands):

Non-Executive Share-Based Awards

RSAs

RSAs are generally valued at the closing price of the Company's common stock on the date of grant. All awards vest in equal annual installments over a period of four years from the date of grant except awards granted to the Company's Board of Directors, which vest over a period of one year.

Non-executive RSUs

The Company issues RSUs based on results of the Company's annual incentive compensation arrangements for certain employees other than those eligible for the executive share-based awards discussed below. These incentive compensation plans provide for a combination of cash payments and RSUs following the end of each annual performance period. The dollar value of share awards to be granted is based on the achievement of performance criteria established in the incentive arrangements. The number of shares of common stock to be awarded is variable, typically based on the closing price of the Company's stock on the date of grant; therefore, these awards are initially classified as liability instruments, with compensation cost recognized from the beginning of the performance period. Awards vest in equal installments over a period of four years from the date of grant. Non-executive RSUs may be settled in shares or cash at the Company's option. To date, all such awards have been settled in shares. The non-executive RSUs do not accumulate dividends prior to vesting.

A summary of activity related to non-executive share-based awards for the periods indicated follows:

The following table summarizes the closing price of the Company's stock on the date of grant for shares granted and the aggregate grant date fair value of shares vesting for the periods indicated (in thousands, except per share data):

The total unrecognized compensation cost of $36.2 million for all RSAs and non-executive RSUs outstanding at December 31, 2023, will be recognized over a weighted average remaining period of 2.5 years.

Executive share-based awards

Certain of the Company's executives are eligible to receive annual awards of RSUs and PSUs (collectively, the "share units"). Annual awards of RSUs represent a fixed number of shares and vest on December 31st in equal tranches over four years for grant periods prior to 2023, and over three years for awards issued in 2023. PSUs are initially granted based on a target value. The number of PSUs that ultimately vest at the end of the performance measurement period will be based on the achievement of performance criteria pre-established by the Compensation Committee of the Board of Directors. Upon vesting, the share units will be converted to common stock on a one-for-one basis, or may be settled in cash at the Company's option. The share units will accumulate dividends declared on the Company's common stock from the date of grant to be paid subsequent to vesting.

As a result of the majority of previous settlements being in cash, all executive RSUs and PSUs have been determined to be liability instruments and are remeasured at fair value each reporting period until the awards are settled. The RSUs are valued based on the closing price of the Company's common stock at the reporting date. The PSUs are valued based on the closing price of the Company's common stock at the reporting date net of a discount related to any applicable market conditions, considering the probability of meeting the defined performance conditions. Compensation cost related to PSUs is recognized during the performance period based on the probable outcome of the respective performance conditions.

A summary of activity related to executive share-based awards for the periods indicated follows:

The total liability for these executive share-based awards was $11.0 million at December 31, 2023. The total unrecognized compensation cost of $9.1 million for unvested executive share-based awards at December 31, 2023 will be recognized over a weighted average remaining period of 1.7 years.

Option Awards

The Company had no option awards outstanding at December 31, 2021 or subsequent thereto. During the year ended December 31, 2021,1,569 option awards with a weighted average exercised price of $15.94, were exercised with immaterial intrinsic value and related tax benefits.

Deferred Compensation Plan

The Company has a non-qualified deferred compensation plan for a group of key management or highly compensated employees whereby a participant, upon election, may defer a portion of eligible compensation. The deferred compensation plan provides for discretionary Company contributions. Generally, the Company has elected not to make contributions. The Company credits each participant's account with income based on either an annual interest rate determined by the Company's Compensation Committee or returns of selected investment portfolios, as elected by the participant. A participant's elective deferrals and interest thereon are at all times 100% vested. Company contributions and interest thereon will become 100% vested upon the earlier of a change in control, as defined, or the participant's death, disability, attainment of normal retirement age or the completion of two years of service. Participant deferrals and any associated earnings will be paid upon separation from service or based on a specified distribution schedule, as elected by the participant. Deferred compensation expense was $2.9 million, $1.4 million and $2.2 million for the years ended December 31, 2023, 2022 and 2021, respectively. Deferred compensation liabilities of $43 million and $37 million were included in other liabilities in the accompanying consolidated balance sheets at December 31, 2023 and 2022, respectively.

BankUnited 401(k) Plan

Under the terms of the 401(k) Plan sponsored by the Company, eligible employees may contribute a portion of compensation not exceeding the limits set by law. Employees are eligible to participate in the plan after one month of service. The 401(k) Plan allows a matching employer contribution equal to 100% of elective deferrals that do not exceed 1% of compensation, plus 70% of elective deferrals that exceed 1% but are less than 6% of compensation. Matching contributions are fully vested after two years of service. For the years ended December 31, 2023, 2022 and 2021, BankUnited made matching contributions to the 401(k) Plan of approximately $6.7 million, $6.2 million and $6.1 million, respectively.

Note 13 Regulatory Requirements and Restrictions

The Company and the Bank are subject to various regulatory capital requirements administered by 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 Company's financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of assets, liabilities and certain off-balance-sheet items calculated pursuant to regulation. The capital amounts and classification also are subject to qualitative judgments by the regulators about components, risk weightings and other factors. Banking regulations identify five capital categories for insured depository institutions: well-capitalized, adequately capitalized, undercapitalized, significantly undercapitalized and critically undercapitalized. As of December 31, 2023 and 2022, all capital ratios of the Company and the Bank exceeded the "well capitalized" levels under the regulatory framework for prompt corrective action. Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios of total, common equity tier 1 and tier 1 capital (as defined in the regulations) to risk-weighted assets (as defined), and of tier 1 capital to average tangible assets (leverage ratio).

The following tables provide information regarding regulatory capital for the Company at the dates indicated (dollars in thousands):

(1)There is no Tier 1 leverage ratio component in the definition of a well-capitalized bank holding company.

Upon the adoption of ASU 2016-13 effective January 1, 2020, the Company elected the option to temporarily delay the effects of CECL on regulatory capital for two years, followed by a three-year transition period.

BankUnited is subject to various regulatory restrictions relating to the payment of dividends, including requirements to maintain capital at or above certain minimums, and to remain "well-capitalized" under the prompt corrective action regulations. The Company does not expect that any of these laws, regulations or policies will materially affect the ability of BankUnited to pay dividends in the foreseeable future.

Note 14 Fair Value Measurements

Assets and liabilities measured at fair value on a recurring basis

The following is a description of the methodologies used to estimate the fair values of assets and liabilities measured at fair value on a recurring basis and the level within the fair value hierarchy in which those measurements are typically classified.

Investment securities available for sale and marketable equity securities—Fair value measurements are based on quoted prices in active markets when available; these measurements are classified within level 1 of the fair value hierarchy. These securities typically include U.S. Treasury securities and certain preferred stocks. If quoted prices in active markets are not available, fair values are estimated using quoted prices of securities with similar characteristics, quoted prices of identical securities in less active markets, discounted cash flow techniques, or matrix pricing models. These securities are generally classified within level 2 of the fair value hierarchy and include U.S. Government agency securities, U.S. Government agency and sponsored enterprise MBS, preferred stock investments for which level 1 valuations are not available, non-mortgage asset-backed securities, single family real estate-backed securities, private label residential MBS and CMOs, private label commercial MBS, collateralized loan obligations and state and municipal obligations. Pricing of these securities is generally primarily spread driven. Observable inputs that may impact the valuation of these securities include benchmark yield curves, credit spreads, reported trades, dealer quotes, bids, issuer spreads, current rating, historical constant prepayment rates, historical voluntary prepayment rates, structural and waterfall features of individual securities, published collateral data, and for certain securities, historical constant default rates and default severities.

The Company uses third-party pricing services in determining fair value measurements for investment securities. To obtain an understanding of the methodologies and assumptions used, management reviews written documentation provided by the pricing services, conducts interviews with valuation desk personnel and reviews model results and detailed assumptions used to value selected securities as considered necessary. Management has established a robust price challenge process that includes a review by the treasury front office of all prices provided on a quarterly basis. Any price evidencing unexpected quarter over quarter fluctuations or deviations from expectations is challenged. If considered necessary to resolve any discrepancies, a price will be obtained from an additional independent valuation source. The Company does not typically adjust the prices provided, other than through this established challenge process. The results of price challenges are subject to review by executive management. Any price discrepancies are resolved based on careful consideration of the assumptions and inputs employed by each of the pricing sources.

Derivative financial instruments—Fair values of interest rate derivatives are determined using widely accepted discounted cash flow modeling techniques. These discounted cash flow models use projections of future cash payments and receipts that are discounted at mid-market rates. Observable inputs that may impact the valuation of these instruments include benchmark swap rates and benchmark forward yield curves. These fair value measurements are generally classified within level 2 of the fair value hierarchy.

The following tables present assets and liabilities measured at fair value on a recurring basis at the dates indicated (in thousands):

Assets and liabilities measured at fair value on a non-recurring basis

Following is a description of the methodologies used to estimate the fair values of assets and liabilities that may be measured at fair value on a non-recurring basis, and the level within the fair value hierarchy in which those measurements are typically classified:

Collateral dependent loans and OREO—The carrying amount of collateral dependent loans is typically based on the fair value of the underlying collateral, which may be real estate, enterprise value or other business assets, less estimated costs to sell when repayment is expected to come from the sale of the collateral. The carrying value of OREO is initially measured based on the fair value of the real estate acquired in foreclosure and subsequently adjusted to the lower of cost or estimated fair value, less estimated cost to sell. Fair values of real estate collateral and OREO are typically based on third-party real estate appraisals which utilize market and income approaches to valuation incorporating both observable and unobservable inputs.

Fair value measurements related to collateral dependent loans and OREO are generally classified within level 3 of the fair value hierarchy.

The following table presents the net carrying value of assets classified within level 3 of the fair value hierarchy at the dates indicated, for which non-recurring changes in fair value were recorded during the period then ended (in thousands):

The following table presents the carrying value and fair value of financial instruments and the level within the fair value hierarchy in which those measurements are classified at the dates indicated (dollars in thousands):

Note 15 Commitments and Contingencies

The Company issues off-balance sheet financial instruments to meet the financing needs of its customers. These financial instruments include commitments to fund loans, unfunded commitments under existing lines of credit, and commercial and standby letters of credit. These commitments expose the Company to varying degrees of credit and market risk which are essentially the same as those involved in extending loans to customers, and are subject to the same credit policies used in underwriting loans. Collateral may be obtained based on the Company’s credit evaluation of the counterparty. The Company’s maximum exposure to credit loss is represented by the contractual amount of these commitments.

Commitments to fund loans

These are agreements to lend funds to customers as long as there is no violation of any condition established in the contract. Commitments to fund loans generally have fixed expiration dates or other termination clauses and may require payment of a fee. Many of these commitments are expected to expire without being funded and, therefore, the total commitment amounts do not necessarily represent future liquidity requirements.

Unfunded commitments under lines of credit

Unfunded commitments under lines of credit include commercial and commercial real estate lines of credit to existing customers, for many of which additional extensions of credit are subject to borrowing base requirements. Some of these commitments may mature without being fully funded, so may not necessarily represent future liquidity requirements.

Commercial and standby letters of credit

Letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. These letters of credit are primarily issued to support trade transactions or guarantee arrangements. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers.

Total lending related commitments outstanding at December 31, 2023 were as follows (in thousands):

Legal Proceedings

The Company is involved in various legal actions arising in the normal course of business. In the opinion of management, based upon advice of legal counsel, the likelihood is remote that the adverse impact of these proceedings, either individually or in the aggregate, would be material to the Company’s consolidated financial position, results of operations or cash flows.

Note 16 Condensed Financial Statements of BankUnited, Inc.

Condensed financial statements of BankUnited, Inc. are presented below (in thousands):

Condensed Balance Sheets

Condensed Statements of Income

Condensed Statements of Cash Flows

Dividends received by BankUnited, Inc. from the Bank totaled $85 million, $605 million and $312 million for the years ended December 31, 2023, 2022 and 2021, respectively.

Note 17 Quarterly Financial Information (Unaudited)

Financial information by quarter for the periods indicated follows (in thousands, except per share data):

Non-interest expense in the fourth quarter of 2023 was negatively impacted by a $35.4 million FDIC special assessment.