Basis of presentation (Policies)	12 Months Ended
Basis of presentation (Policies)	Dec. 31, 2019
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation: The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America and general banking industry. In preparing the financial statements, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and the reported results of operations for the year then ended. Actual results could differ significantly from those estimates. The consolidated financial statements include the accounts of the Company, the Bank, and its’ wholly-owned subsidiaries, FirstBank Insurance, Inc. and Investors Title Company. All significant intercompany accounts and transactions have been eliminated in consolidation. Certain prior period amounts have been reclassified to conform to the current period presentation without any impact on the reported amounts of net income or shareholders’ equity.
Cash flows	Cash flows: For purposes of reporting consolidated cash flows, cash and cash equivalents include cash on hand, amounts due from banks, federal funds sold and interest earning deposits in other financial institutions with maturities of less than 90 days at the date of purchase. These amounts are reported in the consolidated balance sheets caption “Cash and cash equivalents.” Net cash flows are reported for loans held for investment, deposits and borrowings.
Cash and cash equivalents	Cash and cash equivalents: The Company considers all highly liquid unrestricted investments with a maturity of three months or less when purchased to be cash equivalents.
Investment securities	Investment securities: Debt securities are classified as held to maturity and carried at amortized cost when management has the positive intent and ability to hold them to maturity. Debt securities are classified as available-for-sale when they might be sold before maturity. Available-for-sale debt securities are carried at fair value, with unrealized holding gains and losses reported in other comprehensive income, net of applicable taxes. Equity securities with readily determinable market values are carried at fair value on the balance sheet with any periodic changes in value made through adjustments to the statement of income. Equity securities without readily determinable market values are carried at cost less impairment and included in other assets on the balance sheet. Interest income includes the amortization and accretion of purchase premium and discount. Premiums and discounts on securities are amortized on the level-yield method anticipating prepayments based upon the prior three month average monthly prepayments when available. Gains and losses on sales are recorded on the trade date and determined using the specific identification method. The Company evaluates available-for-sale securities for other-than-temporary impairment at least on a quarterly basis, and more frequently when economic or market concerns warrant such evaluation. For securities in an unrealized loss position, consideration is given to the length of time and the extent to which the fair value has been less than cost, the financial condition and near-term prospects of the issuer, and the intent and ability of the Company to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value. In analyzing an issuer’s financial condition, the Company considers whether the securities are issued by the federal government or its agencies, whether downgrades by bond rating agencies have occurred, and the results of reviews of the issuer’s financial condition. When OTTI is determined to have occurred, the amount of the OTTI recognized in earnings depends on the Company's intention to sell the security or if it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis. If the Company intends to sell the security or it is more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, the OTTI recognized in earnings is equal to the entire difference between its amortized cost basis and its fair value at the date it was determined to be OTTI. If the Company does not intend to sell the security and it is not more likely than not to be required to sell the security before recovery of its amortized cost basis, the OTTI is separated into the amount representing the credit loss and the amount related to all other factors. The amount of the total related to the credit loss is determined based on the present value of cash flows expected to be collected and is recognized as a charge to earnings. The amount of the OTTI related to other factors is recognized in other comprehensive income, net of applicable taxes. The previous amortized cost basis less the OTTI recognized in earnings becomes the new amortized cost basis of the investment. During the years ended December 31, 2019, 2018 and 2017, the Company did not record any OTTI on the available-for-sale portfolio; however, during the year ended December 31, 2017, the Company recognized impairment of $945 on one of its equity securities without a readily determinable market value as discussed in Note 4. There were no such impairment charges taken during the years ended December 31, 2019 or 2018.
Loans held for sale	Loans held for sale: Loans originated and intended for sale in the secondary market, primarily mortgage loans, are carried at fair value as permitted under the guidance in ASC 825, “Financial Instruments” (“ASC 825”). Net (losses) gains of $(2,861), $(4,539), and $9,111 resulting from fair value changes of these mortgage loans were recorded in income during the years ended December 31, 2019, 2018 and 2017, respectively. The amount does not reflect changes in fair values of related derivative instruments used to hedge exposure to market-related risks associated with these mortgage loans. The change in fair value of both mortgage loans held for sale and the related derivative instruments are recorded in “Mortgage banking income” in the Consolidated Statements of Income. Gains and losses are recognized in Mortgage banking income on the consolidated statements of income at the time the loan is closed. Pass through origination costs and related loan fees are also included in “Mortgage banking income”. Periodically, the Bank will transfer mortgage loans originated for sale in the secondary markets into the loan portfolio based on current market conditions, the overall secondary marketability of the loan and the status of the loan. During 2019, 2018, and 2017, the Bank transferred $12,259, $14,732, and $11,706, respectively, of residential mortgage loans into its portfolio. The loans are transferred into the portfolio at fair value at the date of transfer. On occasion, the Bank is able to restructure and sell certain of these mortgage loans previously originated to sell in the secondary market that were included in the Bank's loans held for investment portfolio. At the time of transfer, loans are marked to fair value through adjustment to the allowance for loan losses and reclassified to loans held for sale. During the year ended December 31, 2018, the Company transferred $11,888 of loans held for investment to loans held for sale, resulting in an adjustment to the allowance for loan losses of $349. There were no such transfers during the years ended December 31, 3019 or 2017. Government National Mortgage Association (GNMA) optional repurchase programs allow financial institutions to buy back individual delinquent mortgage loans that meet certain criteria from the securitized loan pool for which the institution provides servicing and was the original transferor. At the servicer’s option and without GNMA’s prior authorization, the servicer may repurchase such a delinquent loan for an amount equal to 100 percent of the remaining principal balance of the loan. Under FASB ASC Topic 860, “Transfers and Servicing,” this buy-back option is considered a conditional option until the delinquency criteria are met, at which time the option becomes unconditional. When the Company is deemed to have regained effective control over these loans under the unconditional buy-back option, the loans can no longer be reported as sold and must be brought back onto the balance sheet as loans held for sale, regardless of whether the Company intends to exercise the buy-back option if the buyback option provides the transferor a more-than-trivial benefit. As of December 31, 2019 and 2018, there were $51,705 and $67,362, respectively, of delinquent GNMA loans that had previously been sold; however, the Company determined there not to be a "more-than-trivial benefit" based on an analysis of interest rates and assessment of potential reputational risk associated with these loans. As such, the Company did not rebook any GNMA loans as of December 31, 2019 or 2018.
Loans (excluding purchased credit impaired loans)	Loans (excluding purchased credit impaired loans): Loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off are stated at the principal amount outstanding less any purchase accounting discount net of any accretion recognized to date. Interest on loans is recognized as income by using the simple interest method on daily balances of the principal amount outstanding plus any accretion of purchase accounting discounts. Loans on which the accrual of interest has been discontinued are designated as nonaccrual loans. Accrual of interest is discontinued on loans past due 90 days or more unless the credit is well secured and in the process of collection. Also, a loan may be placed on nonaccrual status prior to becoming past due 90 days if management believes, after considering economic and business conditions and collection efforts, that the borrower’s financial condition is such that collection of principal or interest is doubtful. The decision to place a loan on nonaccrual status prior to becoming past due 90 days is based on an evaluation of the borrower’s financial condition, collateral liquidation value, economic and business conditions and other factors that affect the borrower’s ability to pay. When a loan is placed on nonaccrual status, the accrued but unpaid interest is charged against current period operations. Thereafter, interest on nonaccrual loans is recognized only as received if future collection of principal is probable. If the collectability of outstanding principal is doubtful, interest received is applied as a reduction of principal. A loan may be restored to accrual status when principal and interest are no longer past due or it otherwise becomes both well secured and collectability is reasonably assured.
Allowance for loan losses	Allowance for loan losses: The allowance for loan losses is a valuation allowance for probable incurred credit losses. Loan losses are charged against the allowance when management believes the uncollectibility of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance. Management estimates the allowance balance required using past loan loss experience, the nature and volume of the portfolio, information about specific borrower situations and estimated collateral values, economic conditions, and other factors. Allocations of the allowance may be made for specific loans, but the entire allowance is available for any loan that, in management’s judgment, should be charged off. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest owed. Commercial and commercial real estate loans over $250 are individually evaluated for impairment. If a loan is impaired, a portion of the allowance is allocated so that the loan is reported, net, at the present value of estimated future cash flows using the loan’s existing rate or at the fair value of collateral if repayment is expected solely from the collateral. Large groups of smaller balance homogeneous loans, such as consumer, residential real estate loans, commercial and commercial real estate loans less than $250 are collectively evaluated for impairment, and accordingly, they are not separately identified for impairment disclosures. Loans for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, are considered troubled debt restructurings (“TDRs”) and classified as impaired. TDRs are separately identified for impairment disclosures and are measured at the present value of estimated future cash flows using the loan’s effective rate at inception. If a TDR is considered to be a collateral dependent loan, the loan is reported, net, at the fair value of the collateral. The general component covers non-impaired loans and is based on historical loss experience adjusted for current factors. The historical loss experience is determined by portfolio segment and is based on the actual loss history experienced by the Company over the most recent 5 years. This actual loss experience is supplemented with other economic factors based on the risks present for each portfolio segment. These economic factors include consideration of the following: levels of and trends in delinquencies and impaired loans; levels of and trends in charge-offs and recoveries; trends in volume and terms of loans; effects of any changes in risk selection and underwriting standards; other changes in lending policies, procedures, and practices; experience, ability, and depth of lending management and other relevant staff; national and local economic trends and conditions; industry conditions; and effects of changes in credit concentrations. The following portfolio segments have been identified: Commercial and industrial loans. The Company provides a mix of variable and fixed rate commercial and industrial loans. Commercial and industrial loans are typically made to small- and medium-sized manufacturing, wholesale, retail and service businesses for working capital and operating needs and business expansions, including the purchase of capital equipment and loans made to farmers relating to their operations. This category also includes loans secured by manufactured housing receivables. Commercial and industrial loans generally include lines of credit and loans with maturities of five years or less. The loans are generally made with operating cash flows as the primary source of repayment, but may also include collateralization by inventory, accounts receivable, equipment and/or personal guarantees. The ability of the borrower to collect accounts receivable, and to turn inventory into sales are risk factors in the repayment of the loan. Construction loans. Construction loans include commercial construction, land acquisition and land development loans and single-family interim construction loans to small- and medium-sized businesses and individuals. These loans are generally secured by the land or the real property being built and are made based on our assessment of the value of the property on an as-completed basis. We expect to continue to make construction loans at a similar pace so long as demand continues and the market for and values of such properties remain stable or continue to improve in our markets. These loans can carry risk of repayment when projects incur cost overruns, have an increase in the price of building materials, encounter zoning and environmental issues, or encounter other factors that may affect the completion of a project on time and on budget. Additionally, repayment risk may be negatively impacted when the market experiences a deterioration in the value of real estate. Residential real estate 1-4 family mortgage loans. The Company’s residential real estate 1-4 family mortgage loans are primarily made with respect to and secured by single family homes, which are both owner-occupied and investor owned and include manufactured homes with real estate. The Company intends to continue to make residential 1-4 family housing loans at a similar pace, so long as housing values in our markets do not deteriorate from current prevailing levels and we are able to make such loans consistent with our current credit and underwriting standards. First lien residential 1-4 family mortgages may be affected by unemployment or underemployment and deteriorating market values of real estate. Residential line of credit loans. The Company’s residential line of credit loans are primarily revolving, open-end lines of credit secured by 1-4 residential properties. The Company intends to continue to make home equity loans if housing values in our markets do not deteriorate from current prevailing levels and we are able to make such loans consistent with our current credit and underwriting standards. Second lien residential 1-4 family mortgages may be affected by unemployment or underemployment and deteriorating market values of real estate. Multi-family residential loans. The Company’s multi-family residential loans are primarily secured by multi-family properties, such as apartments and condominium buildings. These loans also may be affected by unemployment or underemployment and deteriorating market values of real estate. Commercial real estate loans. The Company’s commercial real estate owner-occupied loans include loans to finance commercial real estate owner occupied properties for various purposes including use as offices, warehouses, production facilities, health care facilities, retail centers, restaurants, churches and agricultural based facilities. Commercial real estate owner-occupied loans are typically repaid through the ongoing business operations of the borrower, and hence are dependent on the success of the underlying business for repayment and are more exposed to general economic conditions. Commercial real estate non-owner occupied loans. The Company’s commercial real estate non-owner occupied loans include loans to finance commercial real estate non-owner occupied investment properties for various purposes including use as offices, warehouses, health care facilities, hotels, mixed-use residential/commercial, manufactured housing communities, retail centers, assisted living facilities and agricultural based facilities. Commercial real estate non-owner occupied loans are typically repaid with the funds received from the sale of the completed property or rental proceeds from such property, and are therefore more sensitive to adverse conditions in the real estate market, which can also affected by general economic conditions. Consumer and other loans. The Company’s consumer and other loans include loans to individuals for personal, family and household purposes, including car, boat and other recreational vehicle loans, manufactured homes without real estate, and personal lines of credit. Consumer loans are generally secured by vehicles and other household goods. The collateral securing consumer loans may depreciate over time. The company seeks to minimize these risks through its underwriting standards. Other loans also include loans to states and political subdivisions in the U.S. These loans are generally subject to the risk that the borrowing municipality or political subdivision may lose a significant portion of its tax base or that the project for which the loan was made may produce inadequate revenue. As discussed more fully under the subheading "Newly issued not yet effective accounting standards, the Company adopted Accounting Standards Update 2016-13, "Financial Instruments- Credit Losses: Measurement of Credit Losses on Financial Instruments" effective January 1, 2020, which replaces the incurred loss model described above with a model that estimates current expected losses of the loan portfolio over its lifetime.
Business combinations and accounting for acquired loans with credit deterioration	Business combinations and accounting for acquired loans with credit deterioration: Business combinations are accounted for by applying the acquisition method in accordance with ASC 805, “Business Combinations” (“ASC 805”). Under the acquisition method, identifiable assets acquired and liabilities assumed and any non-controlling interest in the acquiree at the acquisition date are measured at their fair values as of that date. Any excess of the purchase price over fair value of net assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including any other identifiable intangible assets, exceed the purchase price, a bargain purchase gain is recognized. Results of operations of acquired entities are included in the Consolidated Statements of Income from the date of acquisition. Loans acquired in business combinations with evidence of credit deterioration since origination and for which it is probable that all contractually required payments will not be collected are considered to be credit-impaired. Purchased credit-impaired loans (“PCI” loans) are accounted for under the accounting guidance for loans and debt securities acquired with deteriorated credit quality, in accordance with ASC 310-30, “Loans and Debt Securities Acquired with Deteriorated Credit Quality” (“ASC 310-30”), and initially measured at fair value, which includes estimated future credit losses expected to be incurred over the life of the loans. Increases in expected cash flows to be collected on these loans are recognized as an adjustment of the loan’s yield over its remaining life, while decreases in expected cash flows are recognized as an impairment. As a result, related discounts are recognized subsequently through accretion based on the expected cash flow of the acquired loans or through adjustment to the allowance for loan loss for any impairment identified subsequent to acquisitions.
Premises and equipment	Premises and equipment: Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation. Provisions for depreciation are computed principally on the straight-line method and are charged to occupancy expense over the estimated useful lives of the assets. Maintenance agreements are amortized to expense over the period of time covered by the agreement. Costs of major additions, replacements or improvements are capitalized while expenditures for maintenance and repairs are charged to expense as incurred. For financial statement purposes, the estimated useful life for premises is forty years, for furniture and fixtures the estimated useful life is seven to ten years, for leasehold improvements the estimated useful life is the lesser of twenty years or the term of the lease and for equipment the estimated useful life is three to seven years.
Other real estate owned	Other real estate owned: Real estate acquired through, or in lieu of, loan foreclosure is initially recorded at fair value less the estimated cost to sell at the date of foreclosure which may establish a new cost basis. Other real estate owned may also include excess facilities and properties held for sale as described in Note 7. Physical possession of residential real estate property collateralizing a consumer mortgage loan occurs when legal title is obtained upon completion of foreclosure or when the borrower conveys all interest in the property to satisfy the loan. After initial measurement, valuations are periodically performed by management and the asset is carried at the lower of carrying amount or fair value less costs to sell. Revenue and expenses from operations are included in other noninterest income and noninterest expenses. Losses due to the valuation of the property are included in gain (loss) on sales or write-downs of other real estate owned.
Leases	Leases: The Company leases certain banking, mortgage and operations locations. Effective January 1, 2019, the Company records leases on the balance sheet in the form of a lease liability for the present value of future minimum payments under the lease terms and a right-of-use asset equal to the lease liability adjusted for items such as deferred or prepaid rent, incentive liabilities, leasehold intangibles and any impairment of the right-of-use asset. In determining whether a contract contains a lease, management conducts an analysis at lease inception to ensure an asset was specifically identified and the Company has control of use of the asset. For contracts determined to be leases entered into after January 1, 2019, the Company performs additional analysis to determine whether the lease should be classified as a finance or operating lease. The Company considers a lease to be a finance lease if future minimum lease payments amount to greater than 90% of the asset's fair value or if the lease term is equal to or greater than 75% of the asset's estimated economic useful life. As of December 31, 2019, the Company did not have any leases that were determined to be finance leases. The Company does not record leases on the consolidated balance sheets that are classified as short term (less than one year). Additionally, the Company has not recorded equipment leases or leases in which the Company is the lessor on the consolidated balance sheets as these are not material to the Company. At lease inception, the Company determines the lease term by adding together the minimum lease term and all optional renewal periods that it is reasonably certain to renew. This determination is at management's full discretion and is made through consideration of the asset, market conditions, competition and entity based economic conditions, among other factors. The lease term is used in the economic life test and also to calculate straight-line rent expense. The depreciable life of leasehold improvements is limited by the estimated lease term, including renewals. Operating leases are expensed on a straight-line basis over the life of the lease beginning when the lease commences. Rent expense and variable lease expense are included in occupancy and equipment expense on the Company's Consolidated statements of income. The Company's variable lease expense include rent escalators that are based on the Consumer Price Index or market conditions and include items such as common area maintenance, utilities, parking, property taxes, insurance and other costs associated with the lease. There are no residual value guarantees or restrictions or covenants imposed by leases that will impact the Company's ability to pay dividends or cause the Company to incur additional expenses. The discount rate used in determining the lease liability is based upon incremental borrowing rates the Company could obtain for similar loans as of the date of commencement or renewal.
Mortgage servicing rights	Mortgage servicing rights: The Company retains the right to service certain mortgage loans that it sells to secondary market investors. The retained mortgage servicing right is initially recorded at the fair value of future net cash flows expected to be realized for performing servicing activities. Fair value is determined using an income approach with various assumptions including expected cash flows, prepayment speeds, market discount rates, servicing costs, and other factors. These mortgage servicing rights are recognized as a separate asset on the date the corresponding mortgage loan is sold. As of January 1, 2017, the Company elected to account for its mortgage servicing rights under the fair value option as permitted under ASC 860-50-35, "Transfers and Servicing". The change in accounting policy resulted in a one-time adjustment to retained earnings of $615 for the after-tax increase in fair value above book value at the time of adoption. Subsequent changes in fair value, including the write downs due to pay offs and paydowns, are recorded in earnings in Mortgage banking income.
Transfers of financial assets	Transfers of financial assets: Transfers of financial assets are accounted for as sales, when control over the assets has been relinquished. Control over transferred assets is deemed to be surrendered when the assets have been isolated from the Company, the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity.
Goodwill and other intangibles	Goodwill and other intangibles: Goodwill represents the excess of the cost of an acquisition over the fair value of the net assets acquired. Goodwill impairment testing is performed annually or more frequently if events or circumstances indicate possible impairment. Goodwill is assigned to the Company’s reporting units, Banking or Mortgage as applicable. Goodwill is evaluated for impairment by either performing a qualitative evaluation or a two-step quantitative test. The qualitative evaluation is an assessment of factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount, including goodwill. If an entity does a qualitative assessment and determines that it is not more likely than not the fair value of a reporting unit is less than its carrying amount, then goodwill of the reporting unit is not considered impaired, and it is not necessary to continue to the two-step goodwill impairment test. If the estimated implied fair value of goodwill is less than the carrying amount, an impairment loss would be recognized in noninterest expense to reduce the carrying amount to the estimated implied fair value which could be material to our operating results for any particular reporting period. No impairment was identified through the qualitative annual assessments for impairment performed as of December 31, 2019 and 2018. A quantitative assessment was performed for the year ended December 31, 2017 which also indicated no impairment. Other intangible assets consist of core deposit intangible assets arising from whole bank and branch acquisitions in addition to both a customer trust intangible and manufactured housing loan servicing intangible. All intangible assets are initially measured at fair value and then amortized over their estimated useful lives. See Note 8 for additional information on other intangibles.
Income taxes	Income taxes: Income tax expense is the total of the current year income tax due and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are the expected future tax amounts for the temporary differences between carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes. A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded. The Company’s policy is to recognize interest and penalties on uncertain tax positions in “Income tax expense” in the Consolidated Statements of Income. There were no amounts related to interest and penalties recognized for the years ended December 31, 2019, 2018 or 2017.
Long-lived assets	Long-lived assets: Premises and equipment, core deposit intangible assets, and other long-lived assets are reviewed for impairment when events indicate their carrying amount may not be recoverable from future undiscounted cash flows. If impaired, the assets are recorded at fair value. No long-lived assets were deemed to be impaired at December 31, 2019 and 2018.
Off-balance sheet financial instruments	Off-balance sheet financial instruments: Financial instruments include off-balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded, unless considered derivatives.
Derivative financial instruments and hedging activities	Derivative financial instruments and hedging activities: All derivative financial instruments are recorded at their fair values in other assets or other liabilities in the consolidated balance sheets in accordance with ASC 815, “Derivatives and Hedging.” If derivative financial instruments are designated as hedges of fair values, both the change in the fair value of the hedge and the hedged item are included in current earnings. If derivative financial instruments are not designated as hedges, only the change in the fair value of the derivative instrument is included in current earnings. Cash flow hedges are utilized to mitigate the exposure to variability in expected future cash flows or other types of forecasted transactions. For the Company’s derivatives designated as cash flow hedges, changes in the fair value of cash flow hedges are, to the extent that the hedging relationship is effective, recorded as other comprehensive income and are subsequently recognized in earnings at the same time that the hedged item is recognized in earnings. The ineffective portions of the changes in fair value of the hedging instruments are immediately recognized in earnings. The assessment of the effectiveness of the hedging relationship is evaluated under the hypothetical derivative method. The Company also utilizes derivative instruments that are not designated as hedging instruments. The Company enters into interest rate cap and/or floor agreements with its customers and then enters into an offsetting derivative contract position with other financial institutions to mitigate the interest rate risk associated with these customer contracts. Because these derivative instruments are not designated as hedging instruments, changes in the fair value of the derivative instruments are recognized currently in earnings. The Company also enters into commitments to originate loans whereby the interest rate on the loan is determined prior to funding (rate-lock commitments). Rate-lock commitments on mortgage loans that are intended to be sold are considered to be derivatives. Accordingly, such commitments, along with any related fees received from potential borrowers, are recorded at fair value in other assets or liabilities, with changes in fair value recorded in the line item “Mortgage banking income” on the Consolidated Statements of Income. Fair value is based on fees currently charged to enter into similar agreements, and for fixed-rate commitments, the difference between current levels of interest rates and the committed rates is also considered. The Company utilizes forward loan sale contracts and forward sales of residential mortgage-backed securities to mitigate the interest rate risk inherent in the Company’s mortgage loan pipeline and held-for-sale portfolio. Forward sale contracts are contracts for delayed delivery of mortgage loans or a group of loans pooled as mortgage-backed securities. The Company agrees to deliver on a specified future date, a specified instrument, at a specified price or yield. However, the contract may allow for cash settlement. The credit risk inherent to the Company arises from the potential inability of counterparties to meet the terms of their contracts. In the event of non-acceptance by the counterparty, the Company would be subject to the credit and inherent (or market) risk of the loans retained. Such contracts are accounted for as derivatives and, along with related fees paid to investor are recorded at fair value in derivative assets or liabilities, with changes in fair value recorded in the line item “Mortgage banking income” on the Consolidated Statements of Income. Fair value is based on the estimated amounts that the Company would receive or pay to terminate the commitment at the reporting date. The Company utilizes two methods to deliver mortgage loans sold to an investor. Under a “best efforts” sales agreement, the Company enters into a sales agreement with an investor in the secondary market to sell the loan when an interest rate-lock commitment is entered into with a customer, as described above. Under a “best efforts” sales agreement, the Company is obligated to sell the mortgage loan to the investor only if the loan is closed and funded. Thus, the Company will not incur any liability to an investor if the mortgage loan commitment in the pipeline fails to close. The Company also utilizes “mandatory delivery” sales agreements. Under a mandatory delivery sales agreement, the Company commits to deliver a certain principal amount of mortgage loans to an investor at a specified price and delivery date. Penalties are paid to the investor should the Company fail to satisfy the contract. Mandatory commitments are recorded at fair value in the Company’s Consolidated Balance Sheets. Gains and losses arising from changes in the valuation of these commitments are recognized currently in earnings and are reflected under the line item “Mortgage banking income” on the Consolidated Statements of Income.
Lender risk account	Lender risk account: During 2018, the Company began selling qualified mortgage loans to FHLB-Cincinnati via the Mortgage Purchase Program (“MPP”). All mortgage loans purchased from members through the MPP are held on the FHLB’s balance sheet. FHLB does not securitize MPP loans for sale to other investors. They mitigate their credit risk exposure through their underwriting and pool composition requirements and through the establishment of the Lender Risk Account (“LRA”) credit enhancement. The LRA protects the FHLB against possible credit losses by setting aside a portion of the initial purchase price into a performance based escrow account that can be used to offset possible loan losses. The LRA amount is established as a percentage applied to the sum of the initial unpaid principal balance of each mortgage in the aggregated pool at the time of the purchase of the mortgage as determined by the FHLB-Cincinnati and is funded by the deduction from the proceeds of sale of each mortgage in the aggregated pool to the FHLB-Cincinnati. As of December 31, 2019 and 2018, the Company had on deposit with the FHLB-Cincinnati $11,225 and $5,225, respectively, in these LRA’s. Additionally, as of December 31, 2019 and 2018, the Company estimated the guaranty account to be $5,546 and $2,646, respectively. The Company bears the risk of receiving less than 100% of its LRA contribution in the event of losses, either by the Company or other members selling mortgages in the aggregated pool. Any losses will be deducted first from the individual LRA contribution of the institution that sold the mortgage of which the loss was incurred. If losses incurred in the aggregated pool are greater than the member’s LRA contribution, such losses will be deducted from the LRA contribution of other members selling mortgages in that aggregated pool. Any portion of the LRA not used to pay losses will be released over a thirty year period and will not start until the end of five years after the initial fill-up period.
Comprehensive income	Comprehensive income: Comprehensive income consists of net income and other comprehensive income. Other comprehensive income includes unrealized gains and losses on available-for-sale securities and derivatives designated as cash flow hedges, net of taxes.
Loss contingencies	Loss contingencies: Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. Management does not believe there are such matters that will have a material effect on the financial statements.
Securities sold under agreements to repurchase	Securities sold under agreements to repurchase: The Company routinely sells securities to certain customers and then repurchases the securities the next business day. Securities sold under agreements to repurchase are recorded on the consolidated balance sheets at the amount of cash received in connection with each transaction in the line item "Borrowings". These are secured liabilities and are not covered by the Federal Deposit Insurance Corporation ("FDIC"). See Note 13, "Borrowings" in the Notes to the consolidated financial statements for additional details regarding securities sold under agreements to repurchase.
Advertising expense	Advertising expense: Advertising costs, including costs related to internet mortgage marketing, lead generation, and related costs, are expensed as incurred. For the years ended December 31, 2019, 2018 and 2017, advertising costs were $9,138, $13,139 and $12,957, respectively.
Earnings per common share	Earnings per common share: Basic earnings per common share ("EPS") excludes dilution and is computed by dividing earnings attributable to common shareholders by the weighted average number of common shares outstanding during the period. Diluted EPS includes the dilutive effect of additional potential common shares issuable under the restricted stock units granted but not yet vested and distributable. Diluted EPS is computed by dividing earnings attributable to common shareholders by the weighted average number of common shares outstanding for the year, plus an incremental number of common-equivalent shares computed using the treasury stock method. Unvested share-based payment awards, which include the right to receive non-forfeitable dividends or dividend equivalents, are considered to participate with common shareholders in undistributed earnings for purposes of computing EPS. Companies that have such participating securities, including the Company, are required to calculate basic and diluted EPS using the two-class method. Certain restricted stock awards granted by the Company include non-forfeitable dividend equivalents and are considered participating securities. Calculations of EPS under the two-class method (i) exclude from the numerator any dividends paid or owed on participating securities and any undistributed earnings considered to be attributable to participating securities and (ii) exclude from the denominator the dilutive impact of the participating securities.
Segment reporting	Segment reporting: The Company’s Mortgage division represents a distinct reportable segment which differs from the Company’s primary business of Banking. Accordingly, a reconciliation of reportable segment revenues, expenses and profit to the Company’s consolidated total has been presented in Note 20.
Stock-based compensation	Stock-based compensation: Stock-based compensation expense is recognized in accordance with ASC 718-20, “Compensation – Stock Compensation Awards Classified as Equity”. Expense is recognized based on the fair value of the portion of stock-based payment awards that are ultimately expected to vest, reduced for forfeitures based on grant-date fair value. The restricted stock unit awards and related expense are amortized over the required service period, if any.
Recently adopted accounting standards and Newly issued not yet effective accounting standards	Recently adopted accounting standards: In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842).” The update requires lessees to recognize right-of-use assets and lease liabilities for all leases not considered short term leases. The provisions of the update also include (a) defining direct costs to only include those incremental costs that would not have been incurred if the lease had not been entered into, (b) circumstances under which the transfer contract in a sale-leaseback transaction should be accounted for as the sale of an asset by the seller-lessee and the purchase of an asset by the buyer-lessor, and (c) additional disclosure requirements. The provisions of this update became effective for the Company on January 1, 2019. In July 2018, the FASB issued ASU 2018-10, “Codification Improvements to Topic 842, Leases” and 2018-11, “Leases (Topic 842): Targeted Improvements”. ASU No. 2018-10 provides improvements related to ASU No. 2016-02 to provide corrections or improvements to a number of areas within FASB Accounting Standards Codification ("ASC") Topic 842 and provides additional and optional transition method to adopt the new lease standard. ASU No. 2018-11 allows entities to initially apply the new lease standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. ASU 2018-11 also allows lessors to not separate non-lease components from the associated lease component if certain conditions are met. The amendments in these updates became effective for the Company on January 1, 2019. The Company elected the optional transition method permitted by ASU 2018-11. Under this method, an entity shall recognize and measure leases that exist at the application date and prior comparative periods are not adjusted. Additionally, the Company elected to adopt the practical expedients allowed under the updates and therefore did not reassess 1) whether any expired or existing contract contain leases, 2) the lease classification for any expired or existing leases, or 3) initial direct costs for any existing leases. On January 1, 2019, the Company adopted these updates and recognized a right of use asset ("ROU") and lease liability of $32,545 and $34,876, respectively, and recorded a cumulative effect adjustment to retained earnings of $1,309, net of deferred taxes of $461, in addition to adjustments to leasehold improvements of $1,022 and a reclassification from a previously-recognized lease intangible asset for $460. The difference between the asset and liability amounts represents lease incentive liabilities, deferred rent and a lease intangible asset that was reclassified to the ROU asset upon adoption. This adoption did not have a significant impact on the Company's consolidated statements of income and did not have an impact on the Company's cash flows. Disclosures required by the update are presented in Note 7, "Leases" in the notes to the consolidated financial statements. In March 2017, the FASB issued ASU 2017-08, “Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities." The amendments in this ASU shorten the amortization period for certain callable debt securities held at a premium. Specifically, the amendments require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount, which continue to be amortized to maturity. Public business entities were required to prospectively apply the amendments in this ASU to annual periods beginning after December 15, 2018, including interim periods. The adoption of this update did not have an impact on the Company's consolidated financial statements. In July 2019, the FASB issued ASU No. 2019-07, “Codification Updates to SEC Sections-Amendments to SEC Paragraphs Pursuant to SEC Final Rule Release No. 33-10532, Disclosure Update and Simplification, and Nos. 33-10231 and 33-10442, Investment Company Reporting Modernization, and Miscellaneous Updates.” These amendments modify FASB Codification to reflect previously issued SEC rules for disclosure updates and simplification and investment company reporting modernization. The SEC adopted these rules to improve its regulations on financial reporting and disclosure. Other miscellaneous updates were made to agree to the electronic Code of Federal Regulations. The amendments in this update became effective upon issuance on July 26, 2019. This update did not significantly impact the consolidated financial statements. Newly issued not yet effective accounting standards: In June 2016, the FASB issued ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.” ASU 2016-13 and its subsequent amendments require the measurement of all current expected credit losses ("CECL") for financial assets (including off-balance sheet credit exposures) held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. The update requires enhanced disclosures related to the significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an organization’s portfolio. Additionally, disclosure of credit quality indicators related to the amortized cost of financing receivables will be further disaggregated by year of origination (or vintage). The new model requires institutions to calculate all probable and estimable losses that are expected to be incurred through the financial asset's entire life through a provision for credit losses, including certain loans obtained as a result of any acquisition. The Update eliminates the existing guidance for PCI loans, but requires an allowance for purchased financial assets with more than insignificant deterioration since origination to be determined in a manner similar to that of other financial assets measured at amortized cost; however, the initial allowance will be added to the purchase price rather than recorded as provision expense. ASU 2016-13 became effective for the Company on January 1, 2020 and management is in the process of finalizing qualitative factors and conducting a thorough review of the calculation and documentation supporting the allowance for credit losses ("ACL") and updating its policy documents and internal controls accordingly. The Company will continue to analyze and modify the calculation throughout the first quarter of 2020, however the Company is currently expecting the impact of adoption of ASU 2016-13 to result in an increase in reserve from the allowance for loan losses reported at December 31, 2019. The Company will record a cumulative effect adjustment for the increase, net of taxes, to retained earnings as of January 1, 2020, which will be included in the Company's quarterly report on From 10-Q for the period ended March 31, 2020. In December 2018, the Office of the Comptroller of the Currency ("OCC"), the Board of Governors of the Federal Reserve System, and the FDIC approved a final rule to address changes to credit loss accounting under GAAP; including banking organizations' implementation of CECL. The final rule provides banking organizations the option to phase in over a three-year period the day-one adverse effects on regulatory capital that may result from the adoption of the new accounting standard. The Company has adopted this transitional guidance to reduce the impact of the initial adoption on regulatory capital. In January 2017, the FASB issued ASU 2017-04, “Intangibles – Goodwill and Other (Topic 350) – Simplifying the Test for Goodwill Impairment.” ASU 2017-04 eliminates step two from the goodwill impairment test. Instead, an entity will perform only step one of its quantitative goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount, and then recognizing an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. An entity will still have the option to perform a qualitative assessment for a reporting unit to determine if the quantitative step one impairment test is necessary. ASU 2017-04 became effective for interim and annual periods beginning after December 15, 2019. The adoption of this standard did not have any impact on the Company's consolidated financial statements or disclosures. In June 2018, FASB issued ASU 2018-07, "Compensation-Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting", which expands the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. Consistent with the accounting for employee share-based payment awards, nonemployee share-based payment awards will be measured at grant-date fair value of the equity instruments obligated to be issued when the good has been delivered or the service rendered and any other conditions necessary to earn the right to benefit from the instruments have been satisfied. This ASU is effective for all entities for fiscal years beginnings after December 15, 2019, and interim periods within fiscal years beginning after December 15, 2020. The adoption of this standard did not have an impact on the Company's consolidated financial statements or disclosures. In August 2018, the FASB issued "Accounting Standards Update 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurements." This update is part of the disclosure framework project and eliminates certain disclosure requirements for fair value measurements, requires entities to disclose new information, and modifies existing disclosure requirements. The new disclosure guidance is effective for fiscal years beginning after December 15, 2019. The adoption of of this update did not have a significant impact to the Company's consolidated financial statements or disclosures. In March 2019, the FASB issued ASU 2019-01, "Leases (Topic 842): Codification Improvements", which align the guidance for fair value of the underlying assets by lessors that are not manufacturers or dealers in Topic 842 with that of existing guidance. As a result, the fair value of the underlying asset at lease commencement is its cost, reflecting any volume or trade discounts that may apply. However, if there has been a significant lapse of time between when the underlying asset is acquired and when the lease commences, the definition of fair value in Topic 820, Fair Value Measurement should be applied. ASU No. 2019-01 also requires lessors within the scope of Topic 942, "Financial Services—Depository and Lending", to present all “principal payments received under leases” within investing activities. The amendments in this update became effective for fiscal years beginning after December 15, 2019. This adoption did not have a significant impact to the Company's consolidated financial statements or disclosures. In December 2019, the FASB issued ASU 2019-12, "Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes" to simplify various aspects of the current guidance to promote consistent application of the standard among reporting entities by moving certain exceptions to the general principles. The amendments are effective for fiscal years beginning after December 15, 2020, with early adoption permitted. The company does not expect adoption of this update to have a significant impact on the Company's consolidated financial statements or disclosures.