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Summary of Significant Accounting Policies | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Summary of Significant Accounting Policies | Summary of Significant Accounting Policies Nature of Operations - Bank of Marin Bancorp ("Bancorp"), headquartered in Novato, California, conducts business primarily through its wholly-owned subsidiary, Bank of Marin (the "Bank"), a California state-chartered commercial bank that provides a wide range of financial services to customers who are predominantly professionals, small and middle-market businesses, and individuals who work and/or reside in Marin, Sonoma, Napa, San Francisco, Alameda, Contra Costa and San Mateo counties. Besides its headquarters located in Novato, CA, the Bank operates ten branches in Marin County, two in Napa County, one in San Francisco, five in Sonoma County, three in Alameda County, and one loan production office in both Contra Costa County and San Mateo County. Basis of Presentation - The consolidated financial statements include the accounts of Bancorp and the Bank. References to “we,” “our,” “us” mean Bancorp and the Bank that are consolidated for financial reporting purposes. Our accounting and reporting policies conform to U.S. generally accepted accounting principles ("GAAP"), general practice, and regulatory guidance within the banking industry. A summary of our significant policies follows. All material intercompany transactions have been eliminated. We evaluated subsequent events through the date of filing with the Securities and Exchange Commission (“SEC”) and determined that, other than the early redemption of the subordinated debenture mentioned below, there were no subsequent events that require additional recognition or disclosure. The NorCal Community Bancorp Trusts I and II, respectively (the "Trusts"), were formed for the sole purpose of issuing trust preferred securities. Bancorp is not considered the primary beneficiary of the Trusts (variable interest entities), therefore the Trusts are not consolidated in our consolidated financial statements. Bancorp's investments in these Trusts are accounted for under the e quity method and included in interest receivable and other assets and the subordinated debenture and related accrued interest payable are recorded as liabilities in our consolidated statements of condition. Refer to Note 7, Borrowings and Other Obligations, for detail on the early redemption on October 7, 2018 of the subordinated debenture due to Trust I and early redemption on March 15, 2021 of the subordinated debenture due to Trust II. Accounting Changes and Reclassifications - Certain items in prior financial statements have been reclassified to conform to the current presentation. In addition, on December 31, 2020, we adopted Accounting Standards Update (“ASU”) 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments and all applicable amendments as subsequently updated for certain clarifications, targeted relief and codification improvements. Accounting Standards Codification (“ASC”) Topic 326 (“ASC 326”) replaced the incurred loss method for measuring credit losses with a current expected credit loss ("CECL") method for financial assets recorded at amortized cost (i.e., loans originated by us and held-to-maturity investment securities). The previous incurred loss method included a general allowance on loans for known and inherent losses within the portfolio, which reflected adjusted historical loss rates and a specific allowance component for impaired loans. The CECL method requires the measurement of all expected credit losses for financial assets measured at amortized cost and certain off-balance-sheet credit exposures to consider credit losses expected to be incurred over the life of the financial asset based on past events, current conditions, and reasonable and supportable forecasts. ASC 326 also requires enhanced disclosures related to the significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards. In addition, ASC 326 includes certain changes to the accounting for available-for-sale investment securities including the requirement to recognize an allowance wh en management intends to sell or believes that it is more likely than not they will be required to sell the security before recovery of its amortized cost. ASC 326 was effective January 1, 2020. However, in accordance with the accounting relief provisions of the Coronavirus Aid, Relief and Economic Security ("CARES") Act passed in March 2020, we postponed the adoption of the CECL standard to the earlier of the end of the national emergency or December 31, 2020. Therefore, we adopted this standard using the modified retrospective method for all financial assets measured at amortized cost, and off-balance-sheet credit exposures, effective October 1, 2020 (the beginning of the first reporting period in which the standard was effective due to the postponement of CECL) through a cumulative adjustment to retained earnings. Results for reporting periods beginning after September 30, 2020 will be presented under the new standard while prior period amounts continue to be reported in accordance with previously applicable GAAP. Upon adoption, we recorded a cumulative adjustment to retained earnings, net of taxes, based on economic forecasts and other assumptions as of December 31, 2019. That adjustment resulted in an increase to our allowance for credit losses of $1.6 million and an increase to the allowance for unfunded loan commitments of $122 thousand. In addition, we recognized the remaining difference between the allowance for credit losses calculated under the CECL model as of December 31, 2020 and the allowance for credit losses calculated under the incurred loss model as of September 30, 2020 as a reversal of the provision for credit losses and a provision for credit losses on unfunded loan commitments, as showed in the tables below. The following tables show the impact to our financial statement line items due to adoption of ASC 326 as of and during the quarter ended December 31, 2020.
(in thousands) | Pre-Tax Increase (Decrease) Upon the Adoption of CECL | Deferred Tax Effect | After Tax Impact of Adoption of CECL
Impact to allowance for credit losses on loans: |  |  |
Allowance for credit losses on loans | $ | 748 |  |  |
Retained earnings (cumulative transition adjustment) | $ | (1,604) |  | $ | 474 |  | $ | (1,130) |
Net income (reversal of provision for credit losses on loans) | $ | 856 |  | $ | (253) |  | $ | 603 |
Impact to allowance for credit losses on unfunded loan commitments: |  |  |
Allowance for credit losses on unfunded commitments | $ | 1,082 |  |  |
Retained earnings (cumulative transition adjustment) | $ | (122) |  | $ | 36 |  | $ | (86) |
Net income (provision for credit losses on unfunded commitments) | $ | (960) |  | $ | 284 |  | $ | (676) |
The following table shows the impact on the allowance for credit losses due to the transition from the incurred loss method to the CECL method by loan class.
(in thousands) | Pre-Adoption Balance at September 30, 2020 | Cumulative Transition Adjustment 1 | Post Adoption Adjusted Balance at October 1, 2020
Allowance for credits losses on loans: |  |  |
Commercial and industrial | $ | 2,525 |  | $ | (278) |  | $ | 2,247 |
Real estate: |  |  |
Commercial owner-occupied | 3,135 |  | 138 |  | 3,273 |
Commercial investor-owned | 11,624 |  | 1,755 |  | 13,379 |
Construction | 860 |  | 201 |  | 1,061 |
Home equity | 1,038 |  | (361) |  | 677 |
Other residential | 1,260 |  | (212) |  | 1,048 |
Installment and other consumer loans | 406 |  | (125) |  | 281 |
Unallocated | 1,265 |  | 486 |  | 1,751 |
Total | $ | 22,113 |  | $ | 1,604 |  | $ | 23,717 |
Allowance for credit losses on unfunded commitments | $ | 1,697 |  | $ | 122 |  | $ | 1,819 |
1 The cumulative transition adjustment resulted from applying the CECL method, which was based on economic forecasts and other assumptions as of December 31, 2019. Refer to Note 3, Loans and Allowance for Credit Losses, for more information.
The Bank did not record an allowance for credit losses on available-for-sale or held-to-maturity investment securities upon the adoption of CECL as the investment portfolio consisted primarily of debt securities explicitly or implicitly backed by the U.S. government and high credit quality obligations of state and political subdivisions. Refer to Note 2, Investment Securities, for more information. Use of Estimates - The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Significant accounting estimates reflected in the consolidated financial statements include the allowance for credit losses, income taxes, and fair value measurements (including fair values of acquired assets and assumed liabilities at acquisition dates) as discussed in the Notes herein. Cash, Cash Equivalents and Restricted Cash - include cash, due from banks, federal funds sold and other short-term investments with maturities of less than three months at the time of purchase. Restricted cash includes reserve requirements held with the Federal Reserve Bank of San Francisco. Investment Securities - are classified as "held-to-maturity," "trading securities" or "available-for-sale." Investments classified as held-to-maturity are those that we have the ability and intent to hold until maturity and are reported at cost, adjusted for the amortization or accretion of premiums or discounts. Investments held for resale in anticipation of short-term market movements are classified as trading securities and are reported at fair value, with unrealized gains and losses included in earnings. Investments that are neither held-to-maturity nor trading are classified as available-for-sale and are reported at fair value. Unrealized gains and losses for available-for-sale securities, net of related taxes, are reported as a separate component of comprehensive income and included in stockholders' equity until realized. For discussion of our methodology in determining fair value, see Note 9, Fair Value of Assets and Liabilities. Purchase premiums and discounts on investment securities are amortized or accreted over the life of the related security as an adjustment to yield using the effective interest method. For certain callable debt securities purchased at a premium, we amortize the premium to the earliest call date. Dividend and interest income are recognized when earned. Realized gains and losses on the sale of securities are included in non-interest income. The specific identification method is used to calculate realized gains and losses on sales of securities. Securities transferred from the available-for-sale category to the held-to-maturity category are recorded at fair value at the date of transfer. Unrealized holding gains or losses on the dates of the transfer of securities from available-for-sale to held-to-maturity are included in the balance of accumulated other comprehensive income (loss), net of tax, in the consolidated balance sheets. These unrealized holding gains or losses on the dates of transfer are amortized over the remaining life of the securities as yield adjustments in a manner consistent with the amortization or accretion of the original purchase premium or discount on the associated security. Allowance for Credit Losses on Investment Securities - The allowance for credit losses on h eld-to-maturity securities is a contra-asset valuation account determined in accordance with ASC 326, which is deducted from the securities' amortized cost basis at the balance sheet date as a result of management's assessment of the net amount expected to be collected. The allowance is measured on a pooled basis for securities with similar risk characteristics using historical credit loss information, adjusted for current conditions and reasonable and supportable forecasts. Securities that are determined to be uncollectible are written off against the allowance. For available-for-sale securities in an unrealized loss position ("impaired security"), we assess whether 1) we intend to sell the security, or, 2) it is more likely than not that we will be required to sell the security before recovery of its amortized cost basis. Under either of these conditions, the security's amortized cost is written down to fair value through a charge to previously recognized allowances or earnings, as applicable. For impaired securities that do not meet these conditions, we assess whether the decline in fair value was due to credit loss or other factors. This assessment considers, among other things: 1) the extent to which the fair value is less than amortized cost, 2) the financial condition and near-term prospects of the issuer, 3) any changes to the rating of the security by a rating agency, and 4) our intent and ability to retain the investment for a period of time sufficient to allow for any anticipated recovery in fair value. If the present value of cash flows expected to be collected is less than the amortized cost basis, a credit loss exists and an allowance for credit losses is recorded for the credit loss component. Any impairment due to non-credit-related factors that has not been recorded through an allowance for credit losses is recognized in other comprehensive income. The discount rate used in determining the present value of the expected cash flows is based on the effective interest rate implicit in the security at the date of purchase. Accrued interest receivable is excluded from the amortized costs and fair values of both held-to-maturity and available-for-sale securities and included in interest receivable and other assets on the consolidated statements of condition. Investment securities are placed on non-accrual status when principal or interest is contractually past due more than ninety days, or management does not expect full payment of principal and interest. We do not record an allowance for credit losses for accrued interest on investment securities, as the amounts are written-off when the investment is placed on non-accrual status. There were no non-accrual investment securities in any of the years presented in the consolidated financial statements. Originated Loans - are reported at amortized cost, which is the principal amount outstanding net of deferred fees (costs), purchase premiums (discounts) and net charge-offs (recoveries). Amortized cost excludes accrued interest, which is reflected in interest receivable and other assets in the consolidated statements of condition. We do not measure an allowance for credit losses on accrued interest receivable balances because these balances are written off in a timely manner as a reduction to interest income when loans are placed on non-accrual status as discussed below. Interest income is accrued daily using the simple interest method. Fees collected upon loan origination and certain direct costs of originating loans are deferred and recognized over the contractual lives of the related loans as yield adjustments using the interest method or straightline method, as applicable. Upon prepayment or other disposition of the underlying loans before their contractual maturities, any associated unearned fees or unamortized costs are recognized. Acquired Loans - ASC 326 modified the accounting for purchased loans and requires that an allowance for credit losses be established at the date of acquisition. However, for purchased financial assets with a more-than-insignificant amount of credit deterioration since origination (“PCD assets”) that are measured at amortized cost, the initial allowance for credit losses is added to the purchase price rather than reported as a provision for credit losses. Subsequent changes in the allowance for credit losses on PCD assets are recognized through the provision for credit losses. Past-Due and Non-Accrual Loan Policy - A loan is considered past due when a payment has not been received by the contractual due date. Loans are placed on non-accrual status when management believes that there is substantial doubt as to the collection of principal or interest, generally when they become contractually past due by 90 days or more with respect to principal or interest, except for loans that are well-secured and in the process of collection. When loans are placed on non-accrual status, any accrued but uncollected interest is reversed from current-period interest income and the amortization of deferred loan origination fees and costs is suspended. Interest payments received on nonaccrual loans are either applied against principal or reported as interest income, according to management’s judgment as to the ultimate collectability of principal. We may return non-accrual loans to accrual status when one of the following occurs: •The borrower has resumed paying the full amount of the principal and interest and we are satisfied with the borrower's financial position. In order to meet this test, we must have received repayment of all past due principal and interest, unless the amounts contractually due are reasonably assured of repayment within a reasonable period of time, and there has been a sustained period of repayment performance (generally, six consecutive monthly payments), according to the original contractual terms or modified terms for loans whose contractual terms have been restructured in a manner which grants a concession to a borrower experiencing financial difficulties (“troubled debt restructuring”). •The loan has become well secured and is in the process of collection. Loan Charge-Off Policy - For all loan types excluding overdraft accounts, we generally make a charge-off determination at or before 90 days past due. A collateral-dependent loan is partially charged down to the fair value of collateral securing it if: (1) it is deemed unc ollectable, o r (2) it has been classified as a loss by either our internal loan review process or external examiners. A non-collateral-dependent loan is partially charged down to its net realizable value under the same circumstances. Overdraft accounts are generally charged off when they exceed 60 days past due. Troubled Debt Restructured Loans - Our loan portfolio includes certain loans modified in a troubled debt restructuring (“TDR”), where we have granted economic concessions to borrowers experiencing financial difficulties. These concessions typically result from our loss mitigation activities and may include reductions in the interest rate, payment extensions, forgiveness of principal, forbearance or other actions. TDRs on non-accrual status at the time of restructure may be returned to accruing status after management considers the borrower’s sustained repayment performance for a reasonable period, generally six months, and obtains reasonable assurance of repayment and performance. Additionally, we may remove a loan from TDR designation if it meets all of the following conditions: •The loan is subsequently refinanced or restructured at current market interest rates and the new terms are consistent with the treatment of creditworthy borrowers under regular underwriting standards; •The borrower is no longer considered to be in financial difficulty; •Performance on the loan is reasonably assured; and •Existing loan did not have any forgiveness of principal or interest. Section 4013 of the CARES Act, subsequently amended by section 541 of the Economic Aid to Hard-Hit Small Businesses, Nonprofits, and Venues Act of 2020 ("Economic Aid Act"), provided optional, temporary relief from evaluating loans that may have been considered TDRs under GAAP. This relief applies to loan modifications executed between March 1, 2020 and the earlier of 60 days after the national emergency is terminated or January 1, 2022. The Bank elected to apply these temporary accounting provisions to payment relief loans beginning in March 2020. Accordingly, modifications that met certain criteria of the CARES Act were not categorized as troubled debt restructurings during 2020. Collateral Dependent Loans - A loan is collateral dependent when the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the sale or operation of the collateral. For collateral dependent loans, including those for which management determines foreclosure is probable, the allowance for credit losses is based on the fair value of the collateral, adjusted for estimated selling costs when repayment is expected from the sale of the collateral, less the loan's amortized c ost. In determining the fair value, management consi ders such information as the appraised value of the c ollateral, observed and potential future changes in collateral value, and historical loss experience for loans that were secured by similar collateral. Generally, with problem credits that are collateral dependent, we obtain appraisals of the collateral at least annually. We may obtain appraisals more frequently if we believe the collateral value is subject to market volatility, if a specific event has affected the collateral, or if we believe foreclosure is imminent. Allowance for Credit Losses on Loans ("ACL") - is a valuation account that is deducted from the amortized cost basis at the balance sheet date to present the net amount of loans expected to be collected. Amortized cost does not include accrued interest, which management elected to exclude from the estimate of expected credit losses (refer to the Past-Due and Non-Accrual Loan Policy section above). Management estimates the allowance quarterly using relevant available information, from internal and external sources, relating to past events, current conditions, and reasonable and supportable forecasts. Credit loss experience provides the basis for the estimation of expected credit losses. The ACL model utilizes a discounted cash flow ("DCF") method to measure the expected credit losses on loans collectively evaluated that are sub-segmented by loan pools with similar credit risk characteristics, which are generally comprised of federal regulatory reporting codes (i.e., Call codes). Pooled segments include the following: •Loans secured by real estate: - 1-4 family residential construction loans - Other construction loans and all land development and other land loans - Secured by farmland (including residential and other improvements) - Revolving, open-end loans secured by 1-4 family residential properties and extended under lines of credit - Closed-end loans secured by 1-4 family residential properties, secured by first liens - Closed-end loans secured by 1-4 family residential properties, secured by junior liens - Secured by multifamily (5 or more) residential properties - Commercial real estate loans secured by owner-occupied non-farm nonresidential properties - Commercial real estate loans secured by other non-farm nonresidential properties •Loans to finance agricultural production and other loans to farmers •Commercial and industrial loans •Loans to individuals for household, family and other personal expenditures (i.e., consumer loans) •Municipal entities •Non-profit organizations •Other loans (overdraft credit lines) The DCF method incorporates assumptions for probability of default ("PD"), loss given default ("LGD"), and prepayments and curtailments over the contractual terms of the loans. Under the DCF method, the ACL reflects the difference between the amortized cost basis and the present value of the expected cash flows using the loan's effective rate. We elected to report the change in present values from one reporting period to the next due to the passage of time and changes in the estimate of future expected cash flows through the provision for credit losses, rather than though interest income. In determining the PD for each pooled segment, the Bank utilized regression analyses to identify certain economic drivers that were considered highly correlated to historical Bank or peer loan default experience. As a result, management chose the California unemployment rate as the primary economic forecast driver for all segments, except for municipal loans. In addition, the annual percentage change in the California gross domestic product was used in the commercial and industrial loan segment and the annual percentage change in California retail sales was used in the owner-occupied and investor-owned commercial real estate segments. For municipal loans, the ACL model utilized a constant default rate obtained from a nationally recognized default rate st udy, which is updated annually. A third party provides LGD estimates for each segment based on a banking industry Frye-Jacobs Risk Index approach. The ACL model incorporates a one-year reasonable and supportable forecast of economic factors, updated quarterly, which is provided by a well-recognized economics advisory company. For periods beyond the forecast horizon the economic factors revert to historical averages on a straight-line basis over a one-year period. Expected credit losses are estimated over the contractual term of the loans, adjusted for expected prepayments and curtailments, when appropriate. The pooled loans' contractual loan terms exclude extensions, renewals, and modifications unless one or more of the following applies: 1) management has a reasonable expectation at the reporting date that a troubled debt restructuring will be executed with an individual borrower, 2) the extension or renewal options are included in the original or modified contract, or 3) an existing troubled debt restructuring is within six months of maturity. Loans that do not share the same risk characteristics as pooled loans are evaluated individually for credit loss and generally include all non-accrual loans, collateral dependent loans, and certain troubled debt restructured loans and loans graded substandard or worse as determined by management. Management considers whether adjustments to the quantitative portion of the ACL are needed for differences in segment-specific risk characteristics or to reflect the extent to which it expects current conditions and reasonable and supportable forecasts of economic conditions to differ from the conditions that existed during the historical period included in the development of PD and LGD. Qualitative internal and external risk factors include, but are not limited to, the following: •Changes in the nature and volume of the loan portfolio •Changes in the volume and severity of past due loans, the volume of non-accruals loans, and the volume and severity of adversely classified or graded loans •The existence and effect of individual loan and loan segment concentrations •Changes in lending policies and procedures, including changes in underwriting standards and collection, charge-off, and recovery practices not considered elsewhere •Changes in the experience, ability, and depth of lending management and other relevant staff •Changes in the quality of our systematic loan review processes •Changes in economic and business conditions, and developments that affect the collectability of the portfolio •Changes in the value of underlying collateral, where applicable •The effect of other external factors such as legal and regulatory requirements on the level of estimated credit losses in the portfolio •The effect of acquisitions of other loan portfolios on our infrastructure, including risk associated with entering new geographic areas as a result of such acquisitions •The presence of specialized lending segments in the portfolio While we believe we use the best information available to determine the allowance for credit losses, our results of operations could be significantly affected if circumstances differ substantially from the assumptions used in determining the allowance. Our ACL model is sensitive to changes in unemployment rate forecasts and certain other assumptions that could result in material fluctuations in the allowance for credit losses and adversely affect our financial condition and results of operations. For further information regarding the allowance for loan losses, see Note 3, Loans and Allowance for Loan Losses. Allowance for Credit Losses on Unfunded Loan Commitments - We make commitments to extend credit to meet the financing needs of our customers in the form of loans or standby letters of credit. We are exposed to credit losses over a loan's contractual period in the event that a decline in credit quality of the borrower leads to nonperformance. We record an allowance for losses on unfunded loan commitments at the balance sheet date based on estimates of probability that these commitments will be drawn upon according to historical utilization experience of different types of commitments and expected loss severity and loss rates determined for pooled funded loans. The allowance for credit losses on unfunded commitments is a liability account included in interest payable and other liabilities on the consolidated statements of condition. Adjustments to the allowance for unfunded commitments are included in non-interest expense as a provision for (or reversal of) the allowance for unfunded commitments. Transfers of Financial Assets - We have entered into certain loan participation agreements with other organizations. We account for these transfers of financial assets as sales when control over the transferred financial assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets and liabilities have been isolated from us, (2) the transferee has the right to pledge or exchange the assets (or beneficial interests) it received, free of conditions that constrain it from taking advantage of that right, beyond a trivial benefit and (3) we do not maintain effective control over the transferred financial assets or third-party beneficial interests related to those transferred assets. No gain or loss has been recognized by us on the sale of these participation interests in 2020, 2019 and 2018. Premises and Equipment - Premises and equipment consist of leasehold improvements, furniture, fixtures, software and equipment and are stated at cost, less accumulated depreciation and amortization, which are calculated on a straight-line basis. Furniture and fixtures are depreciated over eight years and equipment is generally depreciated over three to twenty years. Leasehold improvements are amortized over the lesser of their estimated useful lives or the terms of the leases. When assets are sold or otherwise disposed of, the cost and related accumulated depreciation or amortization are removed from the accounts and any resulting gain or loss is recognized in income for the period. The cost of maintenance and repairs is charged to expense as incurred. Leases - We acc ount for leases in accordance with ASC 842, Leases. As a result of the adoption of ASU 2016-02 on January 1, 2019, we recorded operating and finance lease right-of-use assets totaling $13.4 million, net of deferred rent and unrecognized lease incentives, operating and finance lease liabilities totaling $15.4 million, and no cumulative-effect adjustments to retained earnings. Under the standard's transition guidance, we elected the package of practical expedients, which allowed us to carry forward existing lease classifications under ASC 840, Leases (previous GAAP), and did not require us to reassess initial direct costs for any existing leases. We elected the hindsight practical expedient when determining the lease term (i.e., considering whether we are reasonably certain to exercise options to extend or terminate the lease). In addition, we made accounting policy elections not to separate non-lease components from lease components and to exclude short-term leases (i.e., lease term of 12 months or less at the commencement date) from right-of-use assets and lease liabilities for all lease classifications. We lease certain premises under long-term non-cancelable operating leases, most of which include escalation clauses and one or more options to extend the lease term, and some of which contain lease termination clauses. Only those renewal and termination options that management determines are reasonably certain of exercising are included in the calculation of the lease liability. In addition, we lease certain equipment under finance leases. The equipment finance lease terms do not contain renewal options, bargain purchase options or residual value guarantees. We did not have any significant short-term leases during the reported periods. Lease right-of-use assets represent the right to use the underlying asset while lease liabilities represent the present value of future lease obligations. When calculating the lease liability, because most lease contracts do not contain an implicit interest rate, we discount lease payments over a lease's expected term based on the collateralized Federal Home Loan Bank borrowing rate that was commensurate with lease terms and minimum payments at the lease commencement date. Right-of-use assets for operating leases are amortized over the lease term by amounts that represent the difference between periodic straight-line lease expense and periodic interest accretion on the related liability to make lease payments, whereas finance leases are amortized on a straight-line basis over the term of the lease. Expense recognition for operating leases is recorded on a straight-line basis while expense recognition for finance leases represents the sum of periodic amortization of the associated right-of-use asset and the interest accretion on the lease liability. Refer to Note 12, Commitments and Contingencies, for further information. Business Combinations - Business combinations are accounted for under the acquisition method of accounting in accordance with ASC 805, Business Combinations. A business is defined as a set of activities and assets that is both self-sustaining and managed to provide a return to investors and generally has three elements: inputs, processes and outputs. Under the acquisition method, the acquiring entity in a business combination recognizes the acquired assets and assumed liabilities at their estimated fair values as of the date of acquisition. Any excess of the purchase price over the fair value of net assets and other identifiable intangible assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including other identifiable assets, exceed the purchase price, a bargain purchase gain is recognized. Assets acquired and liabilities assumed from a business combination are recognized at fair value, if the fair value can be determined during the measurement period. Results of operations of an acquired business are included in the consolidated statements of operations from the date of acquisition. Business acquisition-related costs, including conversion and restructuring charges, are expensed as incurred. If substantially all of an acquisition is made up of one asset or several similar assets, or without a substantive process that together contributes to the ability to create outputs, the acquisition is accounted for as an asset acquisition and acquisition costs will be capitalized as part of the assets acquired, rather than expensed in a business combinations. Goodwill and Other Intangible Assets - Goodwill is determined as the excess of the fair value of the consideration transferred, plus the fair value of any noncontrolling interests in the acquiree, over the fair value of the net assets acquired and liabilities assumed as of the acquisition date. Goodwill that arises from a business combination is periodically evaluated for impairment at the reporting unit level, at least annually. Intangible assets with definite useful lives are amortized over their estimated useful lives to their estimated residual values. Core deposit intangible ("CDI") represents the estimated future benefit of deposits related to an acquisition and is booked separately from the related deposits and evaluated periodically for impairment. The CDI asset is amortized on an accelerated method over its estimated useful life of ten years. At December 31, 2020, the future estimated amortization expense for the CDI arising from our past acquisitions is as follows:
(in thousands) | 2021 | 2022 | 2023 | 2024 | 2025 | Thereafter | Total
Core deposit intangible amortization | $ | 818 |  | $ | 782 |  | $ | 719 |  | $ | 422 |  | $ | 400 |  | $ | 690 |  | $ | 3,831 |
We make a qualitative assessment of whether it is more likely than not that the fair value of a reporting unit where goodwill is assigned is less than its carrying amount. If we conclude that it is more likely than not that the fair value is more than its carrying amount, no impairment is recorded. Goodwill is tested for impairment on an interim basis if circumstances change or an event occurs between annual tests that would more likely than not reduce the fair value of the reporting unit below its carrying amount. The qualitative assessment includes adverse events or circumstances identified that could negatively affect the reporting units’ fair value as well as positive and mitigating events. Such indicators may include, among others, significant changes in legal factors or in the general business climate, significant changes in our stock price and market capitalization, unanticipated competition, and an action or assessment by a regulator. If the fair value of a reporting unit is less than its carrying amount, an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value is recognized. The loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. Bank Owned Life Insurance ("BOLI") - The Bank owns life insurance policies on certain key current and former officers. BOLI is recorded in interest receivable and other assets on the consolidated statements of condition at the amount that can be realized under the insurance contract at period-end, which is the cash surrender value adjusted for other charges or amounts due that are probable at settlement. Federal Home Loan Bank of San Francisco ("FHLB") Stock - The Bank is a member of the FHLB. Members are required to own a certain amount of stock based on the level of borrowings and other factors. As of December 31, 2020 and 2019 our investment in FHLB stock was carried at cost, as there was no impairment or changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. We periodically evaluate FHLB stock for impairment based on ultimate recovery of par value. FHLB stock is included as part of interest receivable and other assets on the consolidated statements of condition. Both cash and stock dividends are reported as non-interest income. Investments in Low Income Housing Tax Credit Funds - We have invested in limited partnerships that were formed to develop and operate affordable housing projects for low or moderate-income tenants throughout California. Our ownership percentage in each limited partnership ranges from 1.0% to 3.5%. We account for the investments in qualified affordable housing tax credit funds using the proportional amortization method, where the initial cost of the investment is amortized in proportion to the tax credits and other tax benefits received. Low income housing tax credits and other tax benefits received, net of the amortization of the investment is recognized as part of income tax benefit. Each of the partnerships must meet the regulatory minimum requirements for affordable housing for a minimum 15-year compliance period to fully utilize the tax credits. If the partnerships cease to qualify during the compliance period, the credit may be denied for any period in which the project is not in compliance and a portion of the credit previously taken is subject to recapture with interest. We record an impairment charge if the value of the future tax credits and other tax benefits is less than the carrying value of the investments. Employee Stock Ownership Plan (“ESOP”) - We recognize compensation cost for ESOP contributions when funds become committed for the purchase of Bancorp's common shares into the ESOP in the year in which the employees render service entitling them to the contribution. If we contribute stock, the compensation cost is the fair value of the shares when they are committed to be released (i.e., when the number of shares becomes known and formally approved). In 2020, 2019 and 2018, the Bank only made stock contributions to the ESOP. Income Taxes - Income taxes reported in the consolidated financial statements are computed based on an asset and liability approach. We recognize the amount of taxes payable or refundable for the current year and we record deferred tax assets and liabilities for future tax consequences attributable to differences between the financial statement carrying amount of existing assets and liabilities and their respective tax bases using enacted tax rates in effect for the year in which the temporary differences are expected to reverse. We record net deferred tax assets to the extent it is more likely than not that they will be realized. In evaluating our ability to recover the deferred tax assets and the need to establish a valuation allowance against the deferred tax assets, management considers all available positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, and tax planning strategies. In projecting future taxable income, management develops assumptions including the amount of future state and federal pretax operating income, the reversal of temporary differences, and the implementation of feasible and prudent tax planning strategies. These assumptions require significant judgment about the forecasts of future taxable income and are consistent with the plans and estimates being used to manage the underlying business. Bancorp files consolidated federal and combined state income tax returns. We recognize the financial statement effect of a tax position when it is more likely than not, based on the technical merits and all available evidence, that the position will be sustained upon examination, including the resolution through protests, appeals or litigation processes. For tax positions that meet the more likely than not threshold, we measure and record the largest amount of tax benefit that is greater than fifty percent likely of being realized upon ultimate settlement with the taxing authority. The remainder of the benefits associated with tax positions taken is recorded as unrecognized tax benefits, along with any related interest and penalties. Interest and penalties related to unrecognized tax benefits are recorded in tax expense. In deciding whether or not our tax positions taken meet the more likely than not recognition threshold, we must make judgments and interpretations about the application of inherently complex state and federal tax laws. To the extent tax authorities disagree with tax positions taken by us, our effective tax rates could be materially affected in the period of settlement with the taxing authorities. Revision of our estimate of accrued income taxes also may result from our own income tax planning, which may affect effective tax rates and results of operations for any reporting period. We present an unrecognized tax benefit as a reduction of a deferred tax asset for a net operating loss ("NOL") carryforward, or similar tax loss or tax credit carryforward, rather than as a liability, when (1) the uncertain tax position would reduce the NOL or other carryforward under the tax law of the applicable jurisdiction and (2) we intend to and are able to use the deferred tax asset for that purpose. Otherwise, the unrecognized tax benefit is presented as a liability instead of being netted with deferred tax assets. Earnings per share (“EPS”) - are based upon the weighted average number of common shares outstanding during each year. The following table shows: 1) weighted average basic shares, 2) potentially dilutive weighted average common shares related to stock options and unvested restricted stock awards, and 3) weighted average diluted shares. Basic EPS are calculated by dividing net income by the weighted average number of common shares outstanding during each annual period, excluding unvested restricted stock awards. Diluted EPS are calculated using the weighted average number of potentially dilutive common shares. The number of potentially dilutive common shares included in year-to-date diluted EPS is a year-to-date weighted average of potentially dilutive common shares included in each quarterly diluted EPS computation. In computing diluted EPS, we exclude anti-dilutive shares such as options whose exercise prices exceed the current common stock price, as they would not reduce EPS under the treasury method. We have two forms of outstanding common stock: common stock and unvested restricted stock awards. Holders of unvested restricted stock awards receive non-forfeitable dividends at the same rate as common shareholders and they both share equally in undistributed earnings. Under the two-class method, the difference in EPS is nominal for these participating securities.
(in thousands, except per share data)1 | 2020 | 2019 | 2018
Weighted average basic common shares outstanding | 13,525 |  | 13,620 |  | 13,864 |
Potentially dilutive common shares related to: |  |  |
Stock options | 69 |  | 148 |  | 136 |
Unvested restricted stock awards | 23 |  | 26 |  | 29 |
Weighted average diluted common shares outstanding | 13,617 |  | 13,794 |  | 14,029 |
Net income | $ | 30,242 |  | $ | 34,241 |  | $ | 32,622 |
Basic EPS | $ | 2.24 |  | $ | 2.51 |  | $ | 2.35 |
Diluted EPS | $ | 2.22 |  | $ | 2.48 |  | $ | 2.33 |
Weighted average anti-dilutive common shares not included in the calculation of diluted EPS | 148 |  | 35 |  | 44 |
1 Share and per share data have been adjusted to reflect the two-for-one stock split effective November 27, 2018. Share-Based Compensation - All share-based payments, including stock options and restricted stock, are recognized as stock-based compensation expense in the consolidated statements of comprehensive income based on the grant-date fair value of the award with a corresponding increase in common stock. The grant-date fair value of the award is amortized on a straight-line basis over the requisite service period, which is generally the vesting period. The stock-based compensation expense excludes stock grants to directors as compensation for their services, which are recognized as director expenses separately based on the grant-date value of the stock. We account for forfeitures as they occur. See Note 8, Stockholders' Equity and Stock Option Plans, for further discussion. We determine the fair value of stock options at the grant date using a Black-Scholes pricing model that takes into account the stock price at the grant date, exercise price, expected life of the option, volatility of the underlying stock, expected dividend yield and risk-free interest rate over the expected life of the option. The expected term of options granted is derived from historical data on employee exercises and post-vesting employment termination behavior. The risk-free rate for periods within the expected life of the option is based on the U.S. Treasury yield curve in effect at the time of the grant. Expected volatility is based on the historical volatility of the common stock over the most recent period that is generally commensurate with the expected life of the options. The Black-Scholes option valuation model requires the input of highly subjective assumptions, including the expected life of the stock-based award and stock price volatility. The assumptions used represent management's best estimates based on historical information, but these estimates involve inherent uncertainties and the application of management's judgment. As a result, if other assumptions had been used, the recorded stock-based compensation expense could have been materially different from that recorded in the consolidated financial statements. The fair value of restricted stock is based on the stock price on the grant date. We record excess tax benefits resulting from the exercise of non-qualified stock options, the disqualifying disposition of incentive stock options and vesting of restricted stock awards as tax benefits in the consolidated statements of comprehensive income with a corresponding decrease to current taxes payable. In addition, we reflect excess tax benefits as an operating activity in the consolidated statements of cash flows. Cash paid for tax withholdings when shares are surrendered in a cashless stock option exchange is classified as a financing activity in the consolidated statements of cash flows. Derivative Financial Instruments and Hedging Activities - Fair Value Hedges - All of our interest rate swap contracts are designated and qualified as fair value hedges. The terms of our interest rate swap contracts are closely aligned to the terms of the designated fixed-rate loans. The hedging relationships are tested for effectiveness on a quarterly basis using a qualitative approach. The qualitative analysis includes verification that there are no changes to the derivative's or hedged item's key terms and conditions and no adverse developments regarding risk of counterparty default, and validation that we continue to have fair value hedge designation. The interest rate swaps are carried on the consolidated statements of condition at their fair value in other assets (when the fair value is positive) or in other liabilities (when the fair value is negative). The changes in the fair value of the interest rate swaps are recorded in interest income. The unrealized gains or losses due to changes in fair value of the hedged fixed-rate loans due to changes in benchmark interest rates are recorded as an adjustment to the hedged loans and offset in interest income. For derivative instruments executed with the same counterparty under a master netting arrangement, we do not offset fair value amounts of interest rate swaps in liability positions with the ones in asset positions. From time to time, we make firm commitments to enter into long-term fixed-rate loans with borrowers backed by yield maintenance agreements and simultaneously enter into forward interest rate swap agreements with correspondent banks to mitigate the change in fair value of the yield maintenance agreement. Prior to loan funding, yield maintenance agreements with net settlement features that meet the definition of a derivative are considered as non-designated hedges and are carried on the consolidated statements of condition at their fair value in other assets (when the fair value is positive) or in other liabilities (when the fair value is negative). The offsetting changes in the fair value of the forward swap and the yield maintenance agreement are recorded in interest income. When the fixed-rate loans are originated, the forward swaps are designated to offset the change in fair value in the loans. Subsequent to the point of the swap designations, the fair value of the related yield maintenance agreements at the designation date that was recorded in other assets is amortized using the effective yield method over the life of the respective designated loans. The net effect of the change in fair value of interest rate swaps, the amortization of the yield maintenance agreement and the change in the fair value of the hedged loans due to changes in benchmark interest rates result in an insignificant amount recognized in interest income. For further detail, see Note 14, Derivative Financial Instruments and Hedging Activities. Revenue Recognition - We utilize the following five-step model for non-financial instrument related revenue that is in scope for ASC 606, Revenue from Contracts with Customers: 1) identify the contract, 2) identify the performance obligations in the contract, 3) determine the transaction price, 4) allocate the transaction price to the performance obligations in the contract, and, 5) recognize revenue when (or as) the entity satisfies the performance obligation. Our main revenue streams in scope for ASC 606 include: •Wealth Management & Trust ("WM&T") fees - WM&T services include, but are not limited to: customized investment advisory and management; administrative services such as bill pay and tax reporting; trust administration, estate settlement, custody and fiduciary services. Performance obligations for investment advisory and management services are generally satisfied over time. Revenue is recognized monthly according to a tiered fee schedule based on the client's month-end market value of assets under our management. WM&T does not earn revenue based on performance or incentives. Costs associated with WM&T revenue-generating activities, such as payments to sub-advisors, are recorded separately as part of professional service expenses when incurred. •Deposit account service charges - Service charges on deposit accounts consist of monthly maintenance fees, business account analysis fees, business online banking fees, check order charges, and other deposit account-related fees. Performance obligations for monthly maintenance fees and account analysis fees are satisfied, and the related revenue recognized, when we complete our performance obligation each month. Performance obligations related to transaction-based services (such as check orders) are satisfied, and the related revenue recognized, at a point in time typically when the transaction is completed, except for business accounts subject to analysis where the transaction-based fees are part of the monthly account analysis fees. •Debit card interchange fees - We issue debit cards to our consumer and small business customers that allow them to purchase goods and services from merchants in person, online, or via mobile devices using funds held in their demand deposit accounts held with us. Debit cards issued to our customers are part of global electronic payment networks (such as Visa) who pass a portion of the merchant interchange fees to debit card-issuing member banks like us when our customers make purchases through their networks. Performance obligations for debit card services are satisfied and revenue is recognized daily as the payment networks process transactions. Because we act in an agent capacity, we recognize network costs on a net basis with interchange fees in non-interest income. Advertising Costs - are expensed as incurred. For the years ended December 31, 2020, 2019, and 2018, advertising costs totaled $769 thousand, $775 thousand, and $666 thousand, respectively. Comprehensive Income (Loss) - includes net income, changes in the unrealized gains or losses on available-for-sale investment securities, and amortization of net unrealized gains or losses on securities transferred from available-for-sale to held-to-maturity, net of related taxes, reported on the consolidated statements of comprehensive income and as components of stockholders' equity. Fair Value Measurements - We use fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. We base our fair values on the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (i.e., exit price notion) reflecting factors such as a liquidity premium. Securities available-for-sale and derivatives are recorded at fair value on a recurring basis. Our equity investments that do not have readily determinable fair values are recorded at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. FHLB stock and Visa Inc. Class B common stock are carried at cost as of December 31, 2020 and 2019, as there was no impairment or changes resulting from observable price changes in orderly transactions for an identical or similar investment of the same issuer. Additionally, from time to time, we may be required to record certain assets and liabilities at fair value on a non-recurring basis, such as purchased loans and acquired deposits recorded at acquisition date, certain impaired loans, other real estate owned and securities held-to-maturity that are other-than-temporarily impaired. These non-recurring fair value adjustments typically involve write-downs of individual assets due to application of lower-of-cost or market accounting. When we develop our fair value measurement process, we maximize the use of observable inputs. Whenever there is no readily available market data, we use our best estimates and assumptions in determining fair value, but these estimates involve inherent uncertainties and the application of management's judgment. As a result, if other assumptions had been used, our recorded earnings or disclosures could have been materially different from those reflected in these consolidated financial statements. Other Recently Adopted Accounting Standards In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (ASC Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. The amendments in this ASU remove, modify, and add disclosure requirements for the fair value reporting of assets and liabilities. The modifications and additions relate to Level 3 fair value measurements at the end of the reporting period. ASU 2018-13 is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Entities should disclose and describe the range and weighted-average of significant unobservable inputs used to develop Level 3 fair value measurements. We adopted this ASU prospectively effective January 1, 2020. As the ASU’s requirements only relate to disclosures, the amendments did not impact our financial condition or results of operations. Refer to Note 9, Fair Value of Assets and Liabilities, for additional disclosures. In August 2018, the FASB issued ASU No. 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (ASC Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract. This standard aligns the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software regardless of whether they convey a license to the hosted software. The accounting for the service element of a hosting arrangement that is a service contract is not affected by this ASU. The amendments are effective for public business entities for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. An entity has the option to apply amendments in the ASU either retrospectively or prospectively to all implementation costs incurred after the date of adoption. We adopted this ASU prospectively on January 1, 2020, which did not impact our financial condition and results of operations. Accounting Standards Not Yet Effective In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (ASC Topic 740): Simplifying the Accounting for Income Taxes. This ASU is intended to reduce the cost and complexity related to accounting for income taxes by removing certain exceptions to the guidance in ASC 740 related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and simplifying aspects of the accounting for franchise taxes and enacted changes in tax laws or rates. This ASU is effective for fiscal years beginning after December 15, 2020, and interim periods within those fiscal years. Early adoption is permitted. As this ASU is narrow in scope and applicability to us will likely be minimal, we do not expect that the ASU will have a material impact on our financial condition or results of operations. In January 2020, the FASB issued ASU No. 2020-01, Investments - Equity Securities (ASC Topic 321), Investments - Equity Method and Joint Ventures (ASC Topic 323), and Derivatives and Hedging (ASC Topic 815) - Clarifying the Interactions between ASC 321, ASC 323, and ASC 815. Among other things, this ASU clarifies that a company should consider observable transactions that require a company to either apply or discontinue the equity method of accounting under ASC 323, for the purposes of applying the measurement alternative in accordance with ASC 321. This ASU is effective for fiscal years beginning after December 15, 2020. Early adoption is permitted. ASU No. 2020-01 should be applied prospectively at the beginning of the interim period that includes adoption. We do not expect that the ASU will have a material impact on our financial condition or results of operations. In March 2020, the FASB issued ASU No. 2020-04, Reference Rate Reform (Topic 848). The amendments in this ASU are elective and provide optional guidance for a limited period of time to ease the potential burden of accounting for, or recognizing the effects of reference rate reform. The amendments in this ASU provide optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of reference rate reform. The amendments in this ASU may be elected as of March 12, 2020 through December 31, 2022. An entity may choose to elect the amendments in this update at an interim period subsequent to March 12, 2020 with adoption methods varying based on transaction type. We have not elected to apply amendments at this time, however, will assess the applicability of this ASU to us as we continue to monitor guidance for reference rate reform from FASB and its impact on our financial condition and results of operations. In October 2020, the FASB issued ASU No. 2020-08, Codification Improvements to Subtopic 310-20, Receivables—Nonrefundable Fees and Other Costs. This ASU was issued as part of the Board's ongoing project to improve codification or correct unintended application. This ASU adds clarification to ASU 2017-08, which the Bank early-adopted in 2017, and delineates whether an entity with callable debt securities that have multiple call dates should amortize the amount above that which is repayable, to the next call date. This ASU is effective for fiscal years beginning after December 15, 2020, and interim periods within those fiscal years, on a prospective basis. Early adoption is not permitted. As this ASU is narrow in scope and for clarification purposes, we do not expect this ASU will have a material impact on our financial condition and results of operations. In January 2021, the FASB issued ASU No. 2021-01, Reference Rate Reform (Topic 848). The main amendments in this ASU are intended to clarify certain optional expedients and scope of derivative instruments. The amendments are elective and effective immediately upon issuance of this ASU. Amendments may be elected through December 31, 2022. We have not elected to apply amendments at this time, however, will assess the applicability of this ASU (and ASU 2020-04) to us as we continue to monitor guidance for reference rate reform from FASB and its impact on our financial condition and results of operations.

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