Summary of Significant Accounting Policies (Policies)	12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]
Business and Consolidation	Enterprise is a financial holding company that provides a full range of banking and wealth management services to individuals and corporate customers primarily located in the Arizona, California, Kansas, Missouri, Nevada, and New Mexico markets through its banking subsidiary, Enterprise Bank & Trust. All intercompany accounts and transactions have been eliminated.The Company and its banking subsidiary are subject to the regulations of certain federal and state agencies and undergo periodic examinations by those regulatory agencies. The Company has one operating segment.
Use of Estimates	The consolidated financial statements of the Company have been prepared in conformity with GAAP. In preparing the consolidated financial statements, management is required to make estimates and assumptions, which significantly affect the reported amounts in the consolidated financial statements. Such estimates include the valuation of loans, goodwill, intangible assets, and other long-lived assets, along with assumptions used in the calculation of income taxes, among others. These estimates and assumptions are based on management’s best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using experience and other factors, including the current economic environment, which management believes to be reasonable under the circumstances. Management adjusts such estimates and assumptions when facts and circumstances dictate. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in those estimates resulting from continuing changes in the economic environment will be reflected in the financial statements in future periods.
Cash Flow Information	For purposes of reporting cash flows, the Company considers cash and due from banks, interest-bearing deposits and federal funds sold that mature within 90 days of the balance sheet date to be cash and cash equivalents. At December 31, 2019, approximately $9.7 million of cash and due from banks represented required reserves on deposits maintained by the Company in accordance with Federal Reserve requirements. There were no required reserves on December 31, 2020.
Investments	The Company has classified all investments in debt securities as available-for-sale or held-to-maturity. Securities classified as available-for-sale are carried at fair value. Unrealized holding gains and losses for available-for-sale securities are excluded from earnings and reported as a net amount in a separate component of shareholders’ equity until realized. All previous fair value adjustments included in the separate component of shareholders’ equity are reversed upon sale. Securities classified as held-to-maturity are carried at amortized cost and adjusted for amortization of premiums and accretion of discounts. Prior to the adoption of ASU 2016-13 on January 1, 2020, declines in the fair value of securities below their cost deemed to be other-than-temporary were reflected in operations as realized losses. In estimating other-than-temporary impairment losses, management evaluated investment securities for other-than-temporary declines in fair value on a quarterly basis. This analysis required management to consider various factors, which included (1) the present value of the cash flows expected to be collected compared to the amortized cost of the security, (2) duration and magnitude of the decline in value, (3) the financial condition of the issuer or issuers, (4) structure of the security, and (5) the intent to sell the security or whether it’s more likely than not the Company would be required to sell the security before its anticipated recovery in market value. An ACL on held-to-maturity securities is deducted from the amortized cost basis of the securities to reflect the expected amount to be collected. When it is determined that a security will not be collected, the balance is written-off through the allowance. In evaluating the need for an ACL, securities with similar risk characteristics are grouped and an estimate of expected cash flows is determined using historical loss experience, adjusted for current and reasonable and supportable forecasts of economic conditions. For available-for-sale securities in a loss position, the Company evaluates whether the decline in fair value below amortized cost resulted from a credit loss or other factors. Losses attributed to credit are recognized through an ACL on available-for-sale securities, limited to the amount that the fair value of securities is less than the amortized cost basis. In assessing credit loss, the Company considers, among other things, (1) the extent to which fair value is less than the amortized cost basis, (2) adverse conditions specific to the security or industry, (3) historical payment patterns, (4) the likelihood of future payments, and (5) changes to the rating of a security by a rating agency. The Company has elected to exclude accrued interest receivable balances from the estimate of the ACL as these amounts are timely written off as a credit loss expense. Adjustments to the ACL on held-to-maturity and available-for-sale securities are recognized as a component of the provision for credit losses in the Consolidated Statements of Operations. Premiums and discounts are amortized or accreted over the expected lives of the respective securities as an adjustment to yield using the interest method. Dividend and interest income is recognized when earned. Realized gains and losses are included in earnings and are derived using the specific identification method for determining the cost of securities sold.
Loans Receivable	The Company provides long-term financing of one-to-four-family residential real estate by originating fixed and variable rate loans. Long-term fixed and variable rate loans are usually sold into the secondary market with limited recourse. Upon receipt of an application for a real estate loan, the Company determines whether the loan will be sold into the secondary market or retained in the Company’s loan portfolio. The interest rates on the loans sold are locked with the buyer and the Company bears no interest rate risk related to these loans. Mortgage loans held-for-sale are carried at the lower of cost or fair value, which is determined on a specific identification method. The Company does not retain servicing on these loans. The Company also originates SBA7(a) loans that generally provides for a guarantee of 75% up to a maximum amount. The guaranteed portion of the loan can be sold in an active secondary market. For the year ended December 31, 2020, all SBA7(a) loans are considered held-for-investment; however, as the Company makes the determination to sell the loans, they will be moved into the held-for-sale category. Sales of SBA guaranteed loans are executed on a servicing retained basis, and the Company retains the rights and obligations to service the loans. At December 31, 2020, the Company was servicing $296 million in SBA loans and has recorded a related servicing asset of $5.7 million. The servicing asset is accounted for under the amortization method and is evaluated for impairment. Amortization of the servicing asset is recorded as a reduction to servicing income. Gains on the sale of loans held-for-sale are reported net of direct origination fees and costs in the Company’s Consolidated Statements of Operations. Loans Loans are reported at the principal balance outstanding, net of unearned fees, costs, and premiums or discounts on acquired loans. Loan origination fees, direct origination costs, and premiums or discounts resulting from acquired loans are deferred and recognized over the lives of the related loans as a yield adjustment using the interest method. Interest on loans is accrued to income based on the principal balance outstanding. The recognition of interest income is discontinued when a loan becomes 90 days past due or a significant deterioration in the borrower’s credit has occurred which, in management’s judgment, negatively impacts the collectibility of the loan. Unpaid interest on such loans is reversed at the time the loan becomes uncollectible and subsequent interest payments received are generally applied to principal if any doubt exists as to the collectibility of such principal. Loans that have not been restructured are returned to accrual status when management believes full collectibility of principal and interest is expected. Non-accrual loans that have been restructured will remain in a non-accrual status until the borrower has made at least six months of consecutive contractual payments. The Company has elected to present the accrued interest receivable balance separate from amortized cost basis, to exclude accrued interest receivable balances from the tabular disclosures, and not to estimate an ACL on accrued interest receivable as these amounts are timely written off as a credit loss expense. Accrued interest receivable totaled $31.1 million at December 31, 2020 and was reported in Other Assets on the consolidated balance sheets. Acquired Loans Prior to the adoption of ASU 2016-13 on January 1, 2020, PCI loans were acquired in a business combination or transaction, had evidence of deterioration of credit quality since origination and for which it was probable, at acquisition, that the Company would be unable to collect all contractually required payments receivable. PCI loans were initially recorded at fair value (as determined by the present value of expected future cash flows) with no valuation allowance. The difference between the undiscounted cash flows expected at acquisition and the investment in the loans, or the “accretable yield,” was recognized as interest income on a level-yield method over the life of the loans. Contractually required payments for interest and principal that exceeded the undiscounted cash flows expected at acquisition, or the “nonaccretable difference,” were not recognized as a yield adjustment or as a loss accrual or a valuation allowance. The Company aggregated individual loans with common risk characteristics into pools of loans. Increases in expected cash flows subsequent to the initial investment were recognized prospectively through adjustment of the yield on the loans over their remaining lives. Decreases in expected cash flows due to an inability to collect contractual cash flows were recognized as impairment through the provision for loan losses account. Any allowance for loan loss on these pools reflected only losses incurred after the acquisition. Disposals of loans, including sales of loans, paydowns, payments in full or foreclosures resulted in the removal or reduction of the loan from the loan pool. Subsequent to the adoption of ASU 2016-16, acquired loans are separated into two categories based on the credit risk characteristics of the underlying borrowers as either purchased credit deteriorated (PCD), for loans which have experienced more than insignificant credit deterioration since origination, or loans with no credit deterioration (non-PCD). At the date of acquisition, an ACL on PCD loans is determined and added to the amortized cost basis of the individual loans. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is amortized into interest income over the life of the loan. The ACL on PCD loans is recorded in the acquisition accounting and no provision for credit losses is recognized at the acquisition date. Subsequent changes to the ACL are recorded through provision expense. For non-PCD loans, an ACL is established immediately after the acquisition through a charge to the provision for credit losses. The ACL for both PCD and non-PCD is determined by pooling loans with similar risk characteristics and using the approach discussed below under “Allowance for Credit Losses on Loans”. Impaired Loans Loans are considered “impaired” when it becomes probable that the Company will be unable to collect all amounts due according to the loan’s contractual terms. Non-accrual loans, loans past due greater than 90 days and still accruing, unless adequately secured and in the process of collection, and restructured loans qualify as “impaired loans.” Restructured loans involve the granting of a concession on the terms of a loan to a borrower experiencing financial difficulty. Concessions may be granted in various forms, including changes in payment schedule or interest rate. When measuring impairment, the expected future cash flows of an impaired loan are discounted at the loan’s effective interest rate at origination. Alternatively, impairment can be measured by reference to an observable market price, if one exists, or the fair value of the collateral for a collateral-dependent loan. Loans and leases, which are deemed uncollectible, are charged off to the allowance for credit losses, while recoveries of amounts previously charged off are credited to the allowance for credit losses. Loans are generally placed on non-accrual status when contractually past due 90 days or more as to interest or principal payments. Additionally, whenever management becomes aware of facts or circumstances that may adversely impact the collectability of principal or interest on loans, it is management’s practice to place such loans on non-accrual status immediately, rather than delaying such action until the loans become 90 days past due. Previously accrued and uncollected interest on such loans is reversed. Income is recorded only to the extent that a determination has been made that the principal balance of the loan is collectible and the interest payments are subsequently received in cash, or for a restructured loan, the borrower has made six consecutive contractual payments. If collectibility of the principal is in doubt, payments received are applied to loan principal. Loans past due 90 days or more but still accruing interest are also generally included in nonperforming loans. Loans past due 90 days or more but still accruing are classified as such where the underlying loans are both well secured (the collateral value covers principal and accrued interest) and in the process of collection. Allowance for Credit Losses on Loans The ACL on loans is a valuation account that is deducted from the amortized cost basis to present the net amount expected to be collected. Loans are charged-off against the allowance when management believes the uncollectibility of a loan balance is confirmed. Management estimates the allowance 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. Adjustments to historical loss information are made for differences in current loan-specific risk characteristics such as differences in underwriting standards, portfolio mix, delinquency level, or term as well as for changes in environmental conditions, such as changes in unemployment rates, property values, or other relevant factors. The ACL on loans is measured on a collective basis when similar risk characteristics exist. The Company has identified the following portfolio segments: C&I – C&I loans consist of loans to small and medium-sized businesses in a wide variety of industries. These loans are generally collateralized by inventory, accounts receivable, equipment, real estate and other commercial assets, and may be supported by other credit enhancements such as personal guarantees. Risk arises primarily due to a difference between expected and actual cash flows of the borrower. However, the recoverability of these loans is also dependent on other factors primarily dictated by the type of collateral securing these loans. The fair value of the collateral securing these loans may fluctuate as market conditions change. Included within C&I are revolving loans supported by borrowing bases that fluctuate depending on the amount of underlying collateral. A portion of C&I loans consists of sponsor finance, which are loans with senior debt exposure to private equity backed companies. CRE – CRE loans include various types of loans for which the Company holds real property as collateral. Commercial real estate lending activity is typically restricted to owner-occupied properties or to investor properties that are owned by customers with a current banking relationship. The primary risks of CRE loans include the borrower’s inability to pay, material decreases in the value of the real estate being held as collateral and significant increases in interest rates, which may make the real estate mortgage loan unprofitable. Real estate loans may be more adversely affected by conditions in the real estate markets or in the general economy. Construction and Land Development – The Company originates loans to finance construction projects including one- to four-family residences, multifamily residences, commercial office, and industrial projects. Construction loans are generally collateralized by first liens on the real estate and have floating interest rates. Construction loans are considered to have higher risks due to construction completion and timing risk, and the ultimate repayment being sensitive to interest rate changes, governmental regulation of real property and the availability of long-term financing. Additionally, economic conditions may impact the Company’s ability to recover its investment in construction loans. Adverse economic conditions may negatively impact the real estate market which could affect the borrowers’ ability to complete and sell the project. Additionally, the fair value of the underlying collateral may fluctuate as market conditions change. Residential Real Estate – The Company originates loans to finance one- to four-family residences, secured by both first and second liens. Repayment of these loans is dependent on the borrowers’ ability to pay and the fair value of the underlying collateral. Residential loans with a second lien are inherently riskier due to the junior lien position. Agricultural – Agricultural loans are generally secured with equipment, cattle, crops or other non-real property and at times the underlying real property. Agricultural loans are primarily included as a component of CRE and C&I loans. Consumer – The Company provides a broad range of consumer loans to customers, including personal lines of credit, credit cards and automobile loans. Repayment of these loans is dependent on the borrowers’ ability to pay and the fair value of the underlying collateral. Consumer loans are included as a component of Other loans. The Company utilizes a DCF method to measure the ACL on loans collectively evaluated that are sub-segmented by credit risk levels. The DCF method incorporates assumptions for probability of default, loss given default, prepayments and curtailments over the contractual term of the loans. In determining the probability of default, the Company utilized a regression analysis to determine certain economic factors that are relevant loss drivers in the portfolio segments based on historical or peer evaluations. National unemployment is a loss driver used in nearly all portfolios, except Consumer. The annual percentage change in gross domestic product is also used in C&I, Construction, Agricultural and Consumer portfolios. The annual percentage change in a commercial real estate index, national house price index and the consumer price index are used in the CRE, Residential Real Estate and Consumer portfolios, respectively. The contractual term excludes expected extensions, renewals, and modifications unless either of the following applies: management has a reasonable expectation at the reporting date that a troubled debt restructuring will be executed with an individual borrower or 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. The Company uses a one-year reasonable and supportable forecast that considers baseline, upside and downside economic scenarios. For periods beyond the forecast period, the Company reverts to historical loss rates on a straight-line basis over a one-year period. Loans that do not share risk characteristics are evaluated on an individual basis. Loans evaluated individually are not also included in the collective evaluation. When management determines that foreclosure is probable, expected credit losses are based on the fair value of the collateral at the reporting date, adjusted for selling costs as appropriate. Loan Charge-Offs Loans are charged-off when the primary and secondary sources of repayment (cash flow, collateral, guarantors, etc.) are less than their carrying value.
Other Real Estate	Other real estate represents property acquired through foreclosure or deeded to the Company in lieu of foreclosure on loans on which the borrowers have defaulted on the payment of principal or interest. Other real estate is recorded on an individual asset basis at the lower of cost or fair value less estimated costs to sell. The fair value of other real estate is based upon estimates of future cash flows, market value of similar assets, if available, or independent appraisals. These estimates involve significant uncertainties and judgments. As a result, fair value estimates may not be realizable in a current sale or settlement of the other real estate. Subsequent reductions in fair value are expensed within noninterest expense. Gains and losses resulting from the sale of other real estate are credited or charged to current period earnings. Costs of maintaining and operating other real estate are expensed as incurred, and expenditures to complete or improve other real estate properties are capitalized if the expenditures are expected to be recovered upon ultimate sale of the property.
Fixed Assets	Buildings, leasehold improvements, furniture, fixtures, equipment, and capitalized software are stated at cost less accumulated depreciation. All categories are computed using the straight-line method over their respective estimated useful lives. Furniture, fixtures and equipment is depreciated over three to ten years, buildings and leasehold improvements over ten to forty years, and capitalized software over three years based upon estimated lives or lease obligation periods.
State Tax Credits Held for Sale	The Company has purchased the rights to receive 10-year streams of state tax credits at agreed upon discount rates and sells such tax credits to its clients and others. State tax credits are accounted for at cost.
Cash Surrender Value of Life Insurance	The Company has purchased bank-owned life insurance policies on certain bank officers. Bank-owned life insurance is recorded at its cash surrender value. Changes in the cash surrender values, including death benefits in excess of the carrying amount, are included in noninterest income.
Federal Home Loan Bank Stock	The Bank, as a member of the FHLB, is required to maintain an investment in the capital stock of the FHLB. The stock is redeemable at par by the FHLB, and is, therefore, carried at cost and periodically evaluated for impairment. The Company records FHLB dividends in interest income.
Goodwill and Other Intangible Assets	The Company tests goodwill for impairment on an annual basis and whenever events or changes in circumstances indicate that the Company may not be able to recover the respective asset’s carrying amount. The Company’s annual test for impairment was performed in the fourth quarter of December 31, 2020. Such tests involve the use of estimates and assumptions. Core deposit intangibles are amortized using an accelerated method over an estimated useful life of approximately 10 years. Potential impairments to goodwill must first be identified by performing a qualitative assessment which evaluates relevant events or circumstances to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If this test indicates it is more likely than not that goodwill has been impaired, then a quantitative impairment test is completed. The quantitative impairment test calculates the fair value of the reporting unit and compares it with its carrying amount, including goodwill. If the carrying amount of goodwill exceeds its implied fair market value, an impairment loss is recognized. That loss is equal to the carrying amount of goodwill that is in excess of its implied fair market value.
Impairment of Long-Lived Assets	Long-lived assets, such as fixed assets and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized in the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of are separately presented in the balance sheet and reported at the lower of the carrying amount or fair value less costs to sell, and are no longer depreciated. The assets and liabilities of a disposal group classified as held-for-sale are presented separately in the appropriate asset and liability sections of the balance sheet.
Derivative Financial Instruments and Hedging Activities	The Company uses derivative financial instruments to assist in the management of interest rate sensitivity and to modify the repricing, maturity and option characteristics of certain assets and liabilities. In addition, the Company also offers an interest rate hedge program that includes interest rate swaps to assist its customers in managing their interest rate risk profile. In order to eliminate the interest rate risk associated with offering these products, the Company enters into derivative contracts with third parties to offset the customer contracts. Derivative instruments are required to be measured at fair value and recognized as either assets or liabilities in the consolidated financial statements. Fair value represents the payment the Company would receive or pay if the item were sold or bought in a current transaction. The accounting for changes in fair value (gains or losses) of a hedged item is dependent on whether the related derivative is designated and qualifies for “hedge accounting.” The Company assigns derivatives to one of these categories at the purchase date: cash flow hedge, fair value hedge, or non-designated derivatives. An assessment of the expected and ongoing hedge effectiveness of any derivative designated a fair value hedge or cash flow hedge is performed as required by the accounting standards. Derivatives are included in other assets and other liabilities in the consolidated balance sheets. The fair value amounts recognized for derivative instruments and the fair value amounts recognized for the right to reclaim or obligation to return cash collateral are not offset when represented under a master netting arrangement. Generally, the only derivative instruments used by the Company have been interest rate swaps, forward currency contracts, and interest rate caps. Certain derivative financial instruments are not designated as cash flow or as fair value hedges for accounting purposes. These non-designated derivatives are intended to provide interest rate protection on net interest income or noninterest income but do not meet hedge accounting treatment. Customer accommodation interest rate swap contracts are not designated as hedging instruments. Changes in the fair value of these instruments are recorded in interest income or noninterest income in the consolidated statements of income depending on the underlying hedged item.
Income Taxes	The Company and its subsidiaries file a consolidated federal income tax return. Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled. We evaluate the need for deferred tax asset valuation allowances based on a more-likely-than-not standard. The ability to realize deferred tax assets depends on the ability to generate sufficient positive taxable income within the carryback or carryforward periods provided for in the laws for each applicable taxing jurisdiction. We consider the following possible sources of taxable income: future reversal patterns of existing taxable temporary differences, future taxable income exclusive of reversing temporary differences, taxable income in prior carryback years and the availability of qualified tax planning strategies. The assessment regarding whether a valuation allowance is required or should be adjusted depends on all available positive and negative factors including, but not limited to, nature, frequency, and severity of recent losses, duration of available carryforward periods, experience with tax attributes expiring unused and near and medium term financial outlook. Because of the complexity of tax laws and regulations, interpretation can be difficult and subject to legal judgment given specific facts and circumstances. It is possible that others, given the same information, may at any point in time reach different reasonable conclusions regarding the estimated amounts of accrued taxes.
Stock-Based Compensation	Stock-based compensation is recognized as an expense for stock options, restricted stock awards, performance stock units, and restricted stock units granted to employees, directors, and advisors in return for service. Equity classified awards are measured at the grant date fair value using either an observable market value or a valuation methodology, and recognized over the requisite service period on a straight-line basis. Forfeitures are recorded as they occur. A description of the Company’s stock-based employee compensation plan is described in “Note 16 - Stockholders’ Equity and Compensation Plans.”
Acquisitions and Divestitures	Acquisitions and business combinations are accounted for using the acquisition method of accounting. The assets and liabilities of the acquired entities have been recorded at their estimated fair values at the date of acquisition. Goodwill represents the excess of the purchase price over the fair value of net assets acquired, including the amount assigned to identifiable intangible assets. The purchase price allocation process requires an estimation of the fair values of the assets acquired and the liabilities assumed. When a business combination agreement provides for an adjustment to the cost of the combination contingent on future events, the Company includes an estimate of the acquisition-date fair value as part of the cost of the combination. To determine the fair values, the Company relies on third party valuations, such as appraisals, or internal valuations based on discounted cash flow analyses or other valuation techniques. The results of operations of the acquired business are included in the Company’s consolidated financial statements from the date of acquisition. Merger-related expenses include costs directly related to merger or acquisition activity and include legal and professional fees, system consolidation and conversion costs, and compensation costs such as severance and retention incentives for employees impacted by acquisition activity. The Company accounts for merger-related expenses in the periods in which the costs are incurred and the services are received. For divestitures, the Company measures an asset (disposal group) classified as held-for-sale at the lower of its carrying value at the date the asset is initially classified as held-for-sale or its fair value less costs to sell. The Company reports the results of operations of an entity or group of components that either has been disposed of or held-for-sale as discontinued operations only if the disposal of that component represents a strategic shift that has or will have a major effect on an entity’s operations and financial results. Any incremental direct costs incurred to transact the sale are allocated against the gain or loss on the sale. These costs would include items like legal fees, title transfer fees, broker fees, etc. Any goodwill and intangible assets associated with the portion of the reporting unit to be disposed of is included in the carrying amount of the business in determining the gain or loss on the sale.
Basic and Diluted Earnings Per Common Share	Basic earnings per common share data is calculated by dividing net income available to common shareholders by the weighted average number of common shares outstanding during the period. Common shares outstanding include common stock and restricted stock awards where recipients have satisfied the vesting terms. Diluted earnings per common share gives effect to all dilutive potential common shares outstanding during the period using the treasury stock method.
Consolidated Statement of Comprehensive Income	The Consolidated Statement of Comprehensive Income includes the amount and the related tax impact that have been reclassified from accumulated other comprehensive income to net income. The classification adjustment for unrealized loss/gain on sale of securities included in net income has been recorded through the gain on sale of investment securities line item, within noninterest income, in the Company’s Consolidated Statements of Operations.
Available-for-sale Securities	The unrealized losses at both December 31, 2020, and 2019, were primarily attributable to changes in market interest rates since the securities were purchased. At December 31, 2020, the Company had not recorded an ACL on available-for-sale securities. At December 31, 2019, the Company had not recognized an other-than-temporary impairment. Accrued interest receivable on held-to-maturity debt securities totaled $3.6 million at December 31, 2020 and is excluded from the estimate of expected credit losses. The estimate of expected credit losses considers historical credit loss information adjusted for current conditions and reasonable and supportable forecasts. At December 31, 2020, the ACL on held-to-maturity securities was $0.4 million.
Reclassification, Policy [Policy Text Block]	Certain amounts reported in prior periods have been reclassified to conform to the current presentation. The reclassifications had no effect on net income or shareholders’ equity.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2020

Enterprise is a financial holding company that provides a full range of banking and wealth management services to individuals and corporate customers primarily located in the Arizona, California, Kansas, Missouri, Nevada, and New Mexico markets through its banking subsidiary, Enterprise Bank & Trust. All intercompany accounts and transactions have been eliminated.The Company and its banking subsidiary are subject to the regulations of certain federal and state agencies and undergo periodic examinations by those regulatory agencies. The Company has one operating segment.

Use of Estimates

The consolidated financial statements of the Company have been prepared in conformity with GAAP. In preparing the consolidated financial statements, management is required to make estimates and assumptions, which significantly affect the reported amounts in the consolidated financial statements. Such estimates include the valuation of loans, goodwill, intangible assets, and other long-lived assets, along with assumptions used in the calculation of income taxes, among others. These estimates and assumptions are based on management’s best estimates and judgment. Management evaluates its estimates and assumptions on an ongoing basis using experience and other factors, including the current economic environment, which management believes to be reasonable under the circumstances. Management adjusts such estimates and assumptions when facts and circumstances dictate. As future events and their effects cannot be determined with precision, actual results could differ significantly from these estimates. Changes in those estimates resulting from continuing changes in the economic environment will be reflected in the financial statements in future periods.

Cash Flow Information

For purposes of reporting cash flows, the Company considers cash and due from banks, interest-bearing deposits and federal funds sold that mature within 90 days of the balance sheet date to be cash and cash equivalents. At December 31, 2019, approximately $9.7 million of cash and due from banks represented required reserves on deposits maintained by the Company in accordance with Federal Reserve requirements. There were no required reserves on December 31, 2020.

Investments

The Company has classified all investments in debt securities as available-for-sale or held-to-maturity.

Securities classified as available-for-sale are carried at fair value. Unrealized holding gains and losses for available-for-sale securities are excluded from earnings and reported as a net amount in a separate component of shareholders’ equity until realized. All previous fair value adjustments included in the separate component of shareholders’ equity are reversed upon sale.

Securities classified as held-to-maturity are carried at amortized cost and adjusted for amortization of premiums and accretion of discounts.

Prior to the adoption of ASU 2016-13 on January 1, 2020, declines in the fair value of securities below their cost deemed to be other-than-temporary were reflected in operations as realized losses. In estimating other-than-temporary impairment losses, management evaluated investment securities for other-than-temporary declines in fair value on a quarterly basis. This analysis required management to consider various factors, which included (1) the present value of the cash flows expected to be collected compared to the amortized cost of the security, (2) duration and magnitude of the decline in value, (3) the financial condition of the issuer or issuers, (4) structure of the security, and (5) the intent to sell the security or whether it’s more likely than not the Company would be required to sell the security before its anticipated recovery in market value.

An ACL on held-to-maturity securities is deducted from the amortized cost basis of the securities to reflect the expected amount to be collected. When it is determined that a security will not be collected, the balance is written-off through the allowance. In evaluating the need for an ACL, securities with similar risk characteristics are grouped and an estimate of expected cash flows is determined using historical loss experience, adjusted for current and reasonable and supportable forecasts of economic conditions.

For available-for-sale securities in a loss position, the Company evaluates whether the decline in fair value below amortized cost resulted from a credit loss or other factors. Losses attributed to credit are recognized through an ACL on available-for-sale securities, limited to the amount that the fair value of securities is less than the amortized cost basis. In assessing credit loss, the Company considers, among other things, (1) the extent to which fair value is less than the amortized cost basis, (2) adverse conditions specific to the security or industry, (3) historical payment patterns, (4) the likelihood of future payments, and (5) changes to the rating of a security by a rating agency.

The Company has elected to exclude accrued interest receivable balances from the estimate of the ACL as these amounts are timely written off as a credit loss expense. Adjustments to the ACL on held-to-maturity and available-for-sale securities are recognized as a component of the provision for credit losses in the Consolidated Statements of Operations.

Premiums and discounts are amortized or accreted over the expected lives of the respective securities as an adjustment to yield using the interest method. Dividend and interest income is recognized when earned. Realized gains and losses are included in earnings and are derived using the specific identification method for determining the cost of securities sold.

Loans Receivable

The Company provides long-term financing of one-to-four-family residential real estate by originating fixed and variable rate loans. Long-term fixed and variable rate loans are usually sold into the secondary market with limited recourse. Upon receipt of an application for a real estate loan, the Company determines whether the loan will be sold into the secondary market or retained in the Company’s loan portfolio. The interest rates on the loans sold are

locked with the buyer and the Company bears no interest rate risk related to these loans. Mortgage loans held-for-sale are carried at the lower of cost or fair value, which is determined on a specific identification method. The Company does not retain servicing on these loans.

The Company also originates SBA7(a) loans that generally provides for a guarantee of 75% up to a maximum amount. The guaranteed portion of the loan can be sold in an active secondary market. For the year ended December 31, 2020, all SBA7(a) loans are considered held-for-investment; however, as the Company makes the determination to sell the loans, they will be moved into the held-for-sale category. Sales of SBA guaranteed loans are executed on a servicing retained basis, and the Company retains the rights and obligations to service the loans. At December 31, 2020, the Company was servicing $296 million in SBA loans and has recorded a related servicing asset of $5.7 million. The servicing asset is accounted for under the amortization method and is evaluated for impairment. Amortization of the servicing asset is recorded as a reduction to servicing income.

Gains on the sale of loans held-for-sale are reported net of direct origination fees and costs in the Company’s Consolidated Statements of Operations.

Loans

Loans are reported at the principal balance outstanding, net of unearned fees, costs, and premiums or discounts on acquired loans. Loan origination fees, direct origination costs, and premiums or discounts resulting from acquired loans are deferred and recognized over the lives of the related loans as a yield adjustment using the interest method.

Interest on loans is accrued to income based on the principal balance outstanding. The recognition of interest income is discontinued when a loan becomes 90 days past due or a significant deterioration in the borrower’s credit has occurred which, in management’s judgment, negatively impacts the collectibility of the loan. Unpaid interest on such loans is reversed at the time the loan becomes uncollectible and subsequent interest payments received are generally applied to principal if any doubt exists as to the collectibility of such principal. Loans that have not been restructured are returned to accrual status when management believes full collectibility of principal and interest is expected. Non-accrual loans that have been restructured will remain in a non-accrual status until the borrower has made at least six months of consecutive contractual payments.

The Company has elected to present the accrued interest receivable balance separate from amortized cost basis, to exclude accrued interest receivable balances from the tabular disclosures, and not to estimate an ACL on accrued interest receivable as these amounts are timely written off as a credit loss expense.

Accrued interest receivable totaled $31.1 million at December 31, 2020 and was reported in Other Assets on the consolidated balance sheets.

Acquired Loans

Prior to the adoption of ASU 2016-13 on January 1, 2020, PCI loans were acquired in a business combination or transaction, had evidence of deterioration of credit quality since origination and for which it was probable, at acquisition, that the Company would be unable to collect all contractually required payments receivable. PCI loans were initially recorded at fair value (as determined by the present value of expected future cash flows) with no valuation allowance. The difference between the undiscounted cash flows expected at acquisition and the investment in the loans, or the “accretable yield,” was recognized as interest income on a level-yield method over the life of the loans. Contractually required payments for interest and principal that exceeded the undiscounted cash flows expected at acquisition, or the “nonaccretable difference,” were not recognized as a yield adjustment or as a loss accrual or a valuation allowance. The Company aggregated individual loans with common risk characteristics into pools of loans. Increases in expected cash flows subsequent to the initial investment were recognized prospectively through adjustment of the yield on the loans over their remaining lives. Decreases in expected cash flows due to an inability to collect contractual cash flows were recognized as impairment through the provision for loan losses account. Any allowance for loan loss on these pools reflected only losses incurred after the acquisition. Disposals of loans, including sales of loans, paydowns, payments in full or foreclosures resulted in the removal or reduction of the loan from the loan pool.

Subsequent to the adoption of ASU 2016-16, acquired loans are separated into two categories based on the credit risk characteristics of the underlying borrowers as either purchased credit deteriorated (PCD), for loans which have experienced more than insignificant credit deterioration since origination, or loans with no credit deterioration (non-PCD). At the date of acquisition, an ACL on PCD loans is determined and added to the amortized cost basis of the individual loans. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is amortized into interest income over the life of the loan. The ACL on PCD loans is recorded in the acquisition accounting and no provision for credit losses is recognized at the acquisition date. Subsequent changes to the ACL are recorded through provision expense. For non-PCD loans, an ACL is established immediately after the acquisition through a charge to the provision for credit losses.

The ACL for both PCD and non-PCD is determined by pooling loans with similar risk characteristics and using the approach discussed below under “Allowance for Credit Losses on Loans”.

Impaired Loans

Loans are considered “impaired” when it becomes probable that the Company will be unable to collect all amounts due according to the loan’s contractual terms. Non-accrual loans, loans past due greater than 90 days and still accruing, unless adequately secured and in the process of collection, and restructured loans qualify as “impaired loans.” Restructured loans involve the granting of a concession on the terms of a loan to a borrower experiencing financial difficulty. Concessions may be granted in various forms, including changes in payment schedule or interest rate.

When measuring impairment, the expected future cash flows of an impaired loan are discounted at the loan’s effective interest rate at origination. Alternatively, impairment can be measured by reference to an observable market price, if one exists, or the fair value of the collateral for a collateral-dependent loan. Loans and leases, which are deemed uncollectible, are charged off to the allowance for credit losses, while recoveries of amounts previously charged off are credited to the allowance for credit losses.

Loans are generally placed on non-accrual status when contractually past due 90 days or more as to interest or principal payments. Additionally, whenever management becomes aware of facts or circumstances that may adversely impact the collectability of principal or interest on loans, it is management’s practice to place such loans on non-accrual status immediately, rather than delaying such action until the loans become 90 days past due. Previously accrued and uncollected interest on such loans is reversed. Income is recorded only to the extent that a determination has been made that the principal balance of the loan is collectible and the interest payments are subsequently received in cash, or for a restructured loan, the borrower has made six consecutive contractual payments. If collectibility of the principal is in doubt, payments received are applied to loan principal.

Loans past due 90 days or more but still accruing interest are also generally included in nonperforming loans. Loans past due 90 days or more but still accruing are classified as such where the underlying loans are both well secured (the collateral value covers principal and accrued interest) and in the process of collection.

Allowance for Credit Losses on Loans

The ACL on loans is a valuation account that is deducted from the amortized cost basis to present the net amount expected to be collected. Loans are charged-off against the allowance when management believes the uncollectibility of a loan balance is confirmed.

Management estimates the allowance 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. Adjustments to historical loss information are made for differences in current loan-specific risk characteristics such as differences in underwriting standards, portfolio mix, delinquency level, or term as well as for changes in environmental conditions, such as changes in unemployment rates, property values, or other relevant factors.

The ACL on loans is measured on a collective basis when similar risk characteristics exist. The Company has identified the following portfolio segments:

C&I – C&I loans consist of loans to small and medium-sized businesses in a wide variety of industries. These loans are generally collateralized by inventory, accounts receivable, equipment, real estate and other commercial assets, and may be supported by other credit enhancements such as personal guarantees. Risk arises primarily due to a difference between expected and actual cash flows of the borrower. However, the recoverability of these loans is also dependent on other factors primarily dictated by the type of collateral securing these loans. The fair value of the collateral securing these loans may fluctuate as market conditions change. Included within C&I are revolving loans supported by borrowing bases that fluctuate depending on the amount of underlying collateral. A portion of C&I loans consists of sponsor finance, which are loans with senior debt exposure to private equity backed companies.

CRE – CRE loans include various types of loans for which the Company holds real property as collateral. Commercial real estate lending activity is typically restricted to owner-occupied properties or to investor properties that are owned by customers with a current banking relationship. The primary risks of CRE loans include the borrower’s inability to pay, material decreases in the value of the real estate being held as collateral and significant increases in interest rates, which may make the real estate mortgage loan unprofitable. Real estate loans may be more adversely affected by conditions in the real estate markets or in the general economy.

Construction and Land Development – The Company originates loans to finance construction projects including one- to four-family residences, multifamily residences, commercial office, and industrial projects. Construction loans are generally collateralized by first liens on the real estate and have floating interest rates. Construction loans are considered to have higher risks due to construction completion and timing risk, and the ultimate repayment being sensitive to interest rate changes, governmental regulation of real property and the availability of long-term financing. Additionally, economic conditions may impact the Company’s ability to recover its investment in construction loans. Adverse economic conditions may negatively impact the real estate market which could affect the borrowers’ ability to complete and sell the project. Additionally, the fair value of the underlying collateral may fluctuate as market conditions change.

Residential Real Estate – The Company originates loans to finance one- to four-family residences, secured by both first and second liens. Repayment of these loans is dependent on the borrowers’ ability to pay and the fair value of the underlying collateral. Residential loans with a second lien are inherently riskier due to the junior lien position.

Agricultural – Agricultural loans are generally secured with equipment, cattle, crops or other non-real property and at times the underlying real property. Agricultural loans are primarily included as a component of CRE and C&I loans.

Consumer – The Company provides a broad range of consumer loans to customers, including personal lines of credit, credit cards and automobile loans. Repayment of these loans is dependent on the borrowers’ ability to pay and the fair value of the underlying collateral. Consumer loans are included as a component of Other loans.

The Company utilizes a DCF method to measure the ACL on loans collectively evaluated that are sub-segmented by credit risk levels. The DCF method incorporates assumptions for probability of default, loss given default, prepayments and curtailments over the contractual term of the loans. In determining the probability of default, the Company utilized a regression analysis to determine certain economic factors that are relevant loss drivers in the portfolio segments based on historical or peer evaluations. National unemployment is a loss driver used in nearly all portfolios, except Consumer. The annual percentage change in gross domestic product is also used in C&I, Construction, Agricultural and Consumer portfolios. The annual percentage change in a commercial real estate index, national house price index and the consumer price index are used in the CRE, Residential Real Estate and Consumer portfolios, respectively. The contractual term excludes expected extensions, renewals, and modifications unless either of the following applies: management has a reasonable expectation at the reporting date that a troubled debt restructuring will be executed with an individual borrower or 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.

The Company uses a one-year reasonable and supportable forecast that considers baseline, upside and downside economic scenarios. For periods beyond the forecast period, the Company reverts to historical loss rates on a straight-line basis over a one-year period.

Loans that do not share risk characteristics are evaluated on an individual basis. Loans evaluated individually are not also included in the collective evaluation. When management determines that foreclosure is probable, expected credit losses are based on the fair value of the collateral at the reporting date, adjusted for selling costs as appropriate.

Loan Charge-Offs

Loans are charged-off when the primary and secondary sources of repayment (cash flow, collateral, guarantors, etc.) are less than their carrying value.

Other Real Estate

Other real estate represents property acquired through foreclosure or deeded to the Company in lieu of foreclosure on loans on which the borrowers have defaulted on the payment of principal or interest. Other real estate is recorded on an individual asset basis at the lower of cost or fair value less estimated costs to sell. The fair value of other real estate is based upon estimates of future cash flows, market value of similar assets, if available, or independent appraisals. These estimates involve significant uncertainties and judgments. As a result, fair value estimates may not be realizable in a current sale or settlement of the other real estate. Subsequent reductions in fair value are expensed within noninterest expense.

Gains and losses resulting from the sale of other real estate are credited or charged to current period earnings. Costs of maintaining and operating other real estate are expensed as incurred, and expenditures to complete or improve other real estate properties are capitalized if the expenditures are expected to be recovered upon ultimate sale of the property.

Fixed Assets

Buildings, leasehold improvements, furniture, fixtures, equipment, and capitalized software are stated at cost less accumulated depreciation. All categories are computed using the straight-line method over their respective estimated useful lives. Furniture, fixtures and equipment is depreciated over three to ten years, buildings and leasehold improvements over ten to forty years, and capitalized software over three years based upon estimated lives or lease obligation periods.

State Tax Credits Held for Sale

The Company has purchased the rights to receive 10-year streams of state tax credits at agreed upon discount rates and sells such tax credits to its clients and others. State tax credits are accounted for at cost.

Cash Surrender Value of Life Insurance

The Company has purchased bank-owned life insurance policies on certain bank officers. Bank-owned life insurance is recorded at its cash surrender value. Changes in the cash surrender values, including death benefits in excess of the carrying amount, are included in noninterest income.

Federal Home Loan Bank Stock

The Bank, as a member of the FHLB, is required to maintain an investment in the capital stock of the FHLB. The stock is redeemable at par by the FHLB, and is, therefore, carried at cost and periodically evaluated for impairment. The Company records FHLB dividends in interest income.

Goodwill and Other Intangible Assets

The Company tests goodwill for impairment on an annual basis and whenever events or changes in circumstances indicate that the Company may not be able to recover the respective asset’s carrying amount. The Company’s annual test for impairment was performed in the fourth quarter of December 31, 2020. Such tests involve the use of estimates and assumptions. Core deposit intangibles are amortized using an accelerated method over an estimated useful life of approximately 10 years.

Potential impairments to goodwill must first be identified by performing a qualitative assessment which evaluates relevant events or circumstances to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If this test indicates it is more likely than not that goodwill has been impaired, then a quantitative impairment test is completed. The quantitative impairment test calculates the fair value of the reporting unit and compares it with its carrying amount, including goodwill. If the carrying amount of goodwill exceeds its implied fair market value, an impairment loss is recognized. That loss is equal to the carrying amount of goodwill that is in excess of its implied fair market value.

Impairment of Long-Lived Assets

Long-lived assets, such as fixed assets and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated future cash flows, an impairment charge is recognized in the amount by which the carrying amount of the asset exceeds the fair value of the asset. Assets to be disposed of are separately presented in the balance sheet and reported at the lower of the carrying amount or fair value less costs to sell, and are no longer depreciated. The assets and liabilities of a disposal group classified as held-for-sale are presented separately in the appropriate asset and liability sections of the balance sheet.

Derivative Financial Instruments and Hedging Activities

The Company uses derivative financial instruments to assist in the management of interest rate sensitivity and to modify the repricing, maturity and option characteristics of certain assets and liabilities. In addition, the Company also offers an interest rate hedge program that includes interest rate swaps to assist its customers in managing their interest rate risk profile. In order to eliminate the interest rate risk associated with offering these products, the Company enters into derivative contracts with third parties to offset the customer contracts.

Derivative instruments are required to be measured at fair value and recognized as either assets or liabilities in the consolidated financial statements. Fair value represents the payment the Company would receive or pay if the item were sold or bought in a current transaction. The accounting for changes in fair value (gains or losses) of a hedged item is dependent on whether the related derivative is designated and qualifies for “hedge accounting.” The Company assigns derivatives to one of these categories at the purchase date: cash flow hedge, fair value hedge, or non-designated derivatives. An assessment of the expected and ongoing hedge effectiveness of any derivative designated a fair value hedge or cash flow hedge is performed as required by the accounting standards. Derivatives are included in other assets and other liabilities in the consolidated balance sheets. The fair value amounts recognized for derivative instruments and the fair value amounts recognized for the right to reclaim or obligation to return cash collateral are not offset when represented under a master netting arrangement. Generally, the only derivative instruments used by the Company have been interest rate swaps, forward currency contracts, and interest rate caps.

Certain derivative financial instruments are not designated as cash flow or as fair value hedges for accounting purposes. These non-designated derivatives are intended to provide interest rate protection on net interest income or noninterest income but do not meet hedge accounting treatment. Customer accommodation interest rate swap contracts are not designated as hedging instruments. Changes in the fair value of these instruments are recorded in interest income or noninterest income in the consolidated statements of income depending on the underlying hedged item.

Income Taxes

The Company and its subsidiaries file a consolidated federal income tax return. Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled. We evaluate the need for deferred tax asset valuation allowances based on a more-likely-than-not standard. The ability to realize deferred tax assets depends on the ability to generate sufficient positive taxable income within the carryback or carryforward periods provided for in the laws for each applicable taxing jurisdiction. We consider the following possible sources of taxable income: future reversal patterns of existing taxable temporary differences, future taxable income exclusive of reversing temporary differences, taxable income in prior carryback years and the availability of qualified tax planning strategies. The assessment regarding whether a valuation allowance is required or should be adjusted depends on all available positive and negative factors including, but not limited to, nature, frequency, and severity of recent losses, duration of available carryforward periods, experience with tax attributes expiring unused and near and medium term financial outlook. Because of the complexity of tax laws and regulations, interpretation can be difficult and subject to legal judgment given specific facts and circumstances. It is possible that others, given the same information, may at any point in time reach different reasonable conclusions regarding the estimated amounts of accrued taxes.

Stock-Based Compensation

Stock-based compensation is recognized as an expense for stock options, restricted stock awards, performance stock units, and restricted stock units granted to employees, directors, and advisors in return for service. Equity classified awards are measured at the grant date fair value using either an observable market value or a valuation methodology, and recognized over the requisite service period on a straight-line basis. Forfeitures are recorded as they occur. A description of the Company’s stock-based employee compensation plan is described in “Note 16 - Stockholders’ Equity and Compensation Plans.”

Acquisitions and Divestitures

Acquisitions and business combinations are accounted for using the acquisition method of accounting. The assets and liabilities of the acquired entities have been recorded at their estimated fair values at the date of acquisition. Goodwill represents the excess of the purchase price over the fair value of net assets acquired, including the amount assigned to identifiable intangible assets.

The purchase price allocation process requires an estimation of the fair values of the assets acquired and the liabilities assumed. When a business combination agreement provides for an adjustment to the cost of the combination contingent on future events, the Company includes an estimate of the acquisition-date fair value as part of the cost of the combination. To determine the fair values, the Company relies on third party valuations, such as appraisals, or internal valuations based on discounted cash flow analyses or other valuation techniques. The results of operations of the acquired business are included in the Company’s consolidated financial statements from the date of acquisition. Merger-related expenses include costs directly related to merger or acquisition activity and include legal and professional fees, system consolidation and conversion costs, and compensation costs such as severance and retention incentives for employees impacted by acquisition activity. The Company accounts for merger-related expenses in the periods in which the costs are incurred and the services are received.

For divestitures, the Company measures an asset (disposal group) classified as held-for-sale at the lower of its carrying value at the date the asset is initially classified as held-for-sale or its fair value less costs to sell. The Company reports the results of operations of an entity or group of components that either has been disposed of or held-for-sale as discontinued operations only if the disposal of that component represents a strategic shift that has or will have a major effect on an entity’s operations and financial results.

Any incremental direct costs incurred to transact the sale are allocated against the gain or loss on the sale. These costs would include items like legal fees, title transfer fees, broker fees, etc. Any goodwill and intangible assets associated with the portion of the reporting unit to be disposed of is included in the carrying amount of the business in determining the gain or loss on the sale.

Basic and Diluted Earnings Per Common Share

Basic earnings per common share data is calculated by dividing net income available to common shareholders by the weighted average number of common shares outstanding during the period. Common shares outstanding include common stock and restricted stock awards where recipients have satisfied the vesting terms. Diluted earnings per common share gives effect to all dilutive potential common shares outstanding during the period using the treasury stock method.

Consolidated Statement of Comprehensive Income

The Consolidated Statement of Comprehensive Income includes the amount and the related tax impact that have been reclassified from accumulated other comprehensive income to net income. The classification adjustment for unrealized loss/gain on sale of securities included in net income has been recorded through the gain on sale of investment securities line item, within noninterest income, in the Company’s Consolidated Statements of Operations.

Available-for-sale Securities

The unrealized losses at both December 31, 2020, and 2019, were primarily attributable to changes in market interest rates since the securities were purchased. At December 31, 2020, the Company had not recorded an ACL on

available-for-sale securities. At December 31, 2019, the Company had not recognized an other-than-temporary impairment.

Accrued interest receivable on held-to-maturity debt securities totaled $3.6 million at December 31, 2020 and is excluded from the estimate of expected credit losses. The estimate of expected credit losses considers historical credit loss information adjusted for current conditions and reasonable and supportable forecasts. At December 31, 2020, the ACL on held-to-maturity securities was $0.4 million.

Reclassification, Policy [Policy Text Block]

Certain amounts reported in prior periods have been reclassified to conform to the current presentation. The reclassifications had no effect on net income or shareholders’ equity.