Equity Components [Axis] Common Stock [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) [Member] Investment Type [Axis] US Treasury Securities [Member] US Federal Agency Obligations [Member] Municipal Obligations, Tax Exempt [Member] Municipal Obligations, Taxable [Member] Agency Mortgage-backed Securities [Member] Certificates of Deposit [Member] Range [Axis] Maximum [Member] Financial Instrument [Axis] Agriculture Loans [Member] Class of Financing Receivable, Type of Borrower [Axis] Trouble Debt Restructurings [Member] One-To-Four Family Residential Real Estate Loans [Member] Construction and Land Loans [Member] Commercial Real Estate Loans [Member] Commercial Loans [Member] Municipal Loans [Member] Consumer Loans [Member] Defined Benefit Plan, Asset Categories [Axis] Construction and Land [Member] Commercial Real Estate Loans [Member] Agriculture [Member] Municipal [Member] Receivable Type [Axis] Loans Receivables Non Classified [Member] Loans Receivables Classified [Member] Mortgage Loans on Real Estate, Loan Type [Axis] Mortgage Loans Serviced [Member] Minimum [Member] Weighted Average [Member] Mortgage Repurchase Reserve [Member] Finite-Lived Intangible Assets by Major Class [Axis] Core Deposit Intangible Assets [Member] Lease Intangible Asset [Member] Mortgage Servicing Rights [Member] Federal Home Loan Bank Certificates and Obligations (FHLB) [Member] Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] Repurchase Agreements [Member] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Overnight and Continuous [Member] Securities or Other Assets Sold under Agreements to Repurchase [Axis] Upto 30 Days [Member] 30 - 90 Days [Member] Greater Than 90 Days [Member] Financing Receivables, Period Past Due [Axis] 30-59Days Delinquent and Accruing [Member] 60-89 Days Delinquent and Accruing [Member] Financing Receivables, 30 to 59 Days Past Due [Member] Consumer Loan [Member] Residential Real Estate [Member] Commercial Loans [Member] Fair Value, Hierarchy [Axis] Level 3 [Member] Level 2 [Member] Measurement Basis [Axis] Reported Value Measurement [Member] Level 1 [Member] Measurement Frequency [Axis] Fair Value, Measurements, Recurring [Member] Cash and Cash Equivalents [Axis] Underlying Asset Class [Axis] Common Stocks [Member] Fair Value, Measurements, Nonrecurring [Member] Financial Instruments Owned and Pledged as Collateral by Type [Axis] Agriculture loans [Member] Investment Holding [Axis] Small Bank Holding Companies [Member] Capital Conservation Buffer [Member] Scenario [Axis] January 1, 2019 [Member] Legal Entity [Axis] Companys Regulatory Capital Requirements [Member] Banks Regulatory Capital Requirements [Member] Adjustments for New Accounting Pronouncements [Axis] Accounting Standards Update 2016-09 [Member] TDR [Member] Related Party [Axis] Third Party [Member] Agriculture [Member] Award Type [Axis] Restricted Stock [Member] Financing Receivable Portfolio Segment [Axis] Commercial Portfolio Segment [Member] Property, Plant and Equipment, Type [Axis] Land [Member] Office Buildings and Improvements [Member] Furniture and Equipment [Member] Automobiles [Member] Short-term Debt, Type [Axis] Federal Home Loan Bank Advances [Member] Subordinated Borrowing [Axis] Subordinated Debentures 2003 [Member] Subordinated Debentures 2005 [Member] Subordinated Debentures 2013 [Member] Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] Split Dollar Life Insurance Agreement [Member] Deferred Compensation Agreements [Member] Plan Name [Axis] 2015 Stock Incentive Plan [Member] Parent Company [Member] Variable Rate [Axis] LIBOR [Member] Accounting Standards Update 2018-02 [Member] US Federal Treasury Securities [Member] Four Agriculture Loans [Member] Real Estate Owned One-To-Four Family Residential Real Estate [Member] Real Estate Owned Commercial Real Estate [Member] Federal Funds Rate [Member] Unrelated Financial Institution [Member] Prime Rate [Member] Document And Entity Information Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Common Stock, Shares Outstanding Trading Symbol Document Fiscal Period Focus Document Fiscal Year Focus Statement of Financial Position [Abstract] Assets Cash and cash equivalents Investment securities available-for-sale, at fair value Bank stocks, at cost Loans, net of allowance for loans losses of $5,459 and $5,344 Loans held for sale, at fair value Premises and equipment, net Bank owned life insurance Goodwill Other intangible assets, net Real estate owned, net Accrued interest and other assets Total assets Liabilities and Stockholders’ Equity Liabilities: Deposits: Non-interest bearing demand Money market and checking Savings Time Total deposits Federal Home Loan Bank borrowings Subordinated debentures Other borrowings Accrued interest and other liabilities Total liabilities Commitments and contingencies Stockholders’ equity: Preferred stock, $0.01 par, 200,000 shares authorized; none issued Common stock, $0.01 par, 7,500,000 shares authorized; 4,081,659 and 4,061,481 shares issued and outstanding at December 31, 2017 and 2016 respectively Additional paid-in capital Retained earnings Accumulated other comprehensive loss Total stockholders’ equity Total liabilities and stockholders’ equity Net of allowance for loans losses Preferred stock, par value Preferred stock, shares authorized Preferred stock, shares issued Common stock, par value Common stock, shares authorized Common stock, shares issued Common stock, shares outstanding Income Statement [Abstract] Interest income: Loans: Taxable Tax-exempt Investment securities: Taxable Tax-exempt Total interest income Interest expense: Deposits Subordinated debentures Borrowings Total interest expense Net interest income Provision for loan losses Net interest income after provision for loan losses Non-interest income: Fees and service charges Gains on sales of loans, net Increase in cash surrender value of bank owned life insurance Gains (losses) on sales of investment securities, net Other Total non-interest income Non-interest expense: Compensation and benefits Occupancy and equipment Data processing Amortization of intangibles Professional fees Advertising Federal deposit insurance premiums Foreclosure and real estate owned expense Deposit-related loss Other Total non-interest expense Earnings before income taxes Income tax (benefit) expense Net earnings Earnings per share: Basic Diluted Stock dividend, percentage Statement of Comprehensive Income [Abstract] Net earnings Net unrealized holding gains (losses) on available-for-sale securities Less reclassification adjustment on (gains) losses included in earnings Net unrealized gains (losses) Income tax effect on net gains (losses) included in earnings Income tax effect on net unrealized holding gains (losses) Other comprehensive income (loss) Total comprehensive income Statement [Table] Statement [Line Items] Balance Other comprehensive income Dividends paid Stock-based compensation Exercise of stock options Stock dividend Tax reclassification from early adoption of ASU 2018-02 Balance Statement of Stockholders' Equity [Abstract] Dividend, per share Excise of stock option, shares Excess tax benefit related to stock option plans Stock dividends Statement of Cash Flows [Abstract] Cash flows from operating activities: Adjustments to reconcile net earnings to net cash provided by operating activities: Valuation allowance on real estate owned Amortization of investment security premiums, net Amortization of purchase accounting adjustment on loans Amortization of purchase accounting adjustment on subordinated debentures Depreciation Increase in cash surrender value of bank owned life insurance Stock-based compensation Deferred income taxes Net (gain) loss on investment securities Impairment of affordable housing investment Net (gain) loss on sales of premises and equipment and foreclosed assets Net gains on sales of loans Proceeds from sale of loans Origination of loans held for sale Changes in assets and liabilities: Accrued interest and other assets Accrued interest, expenses and other liabilities Net cash provided by operating activities Cash flows from investing activities: Net increase in loans Maturities and prepayments of investment securities Purchases of investment securities Proceeds from sale of investment securities Redemption of bank stocks Purchase of bank stocks Proceeds from sales of premises and equipment and foreclosed assets Proceeds from bank owned life insurance Purchase of bank owned life insurance Purchases of premises and equipment, net Net cash used in investing activities Cash flows from financing activities: Net increase in deposits Federal Home Loan Bank advance borrowings Federal Home Loan Bank advance repayments Proceeds from other borrowings Repayments on other borrowings Proceeds from exercise of stock options Payment of dividends Net cash provided by financing activities Net (decrease) increase in cash and cash equivalents Cash and cash equivalents at beginning of year Cash and cash equivalents at end of year Supplemental disclosure of cash flow information: Cash paid during the year for income taxes Cash paid during the year for interest Supplemental schedule of noncash investing and financing activities: Transfer of loans to real estate owned Investment securities purchases not yet settled Accounting Policies [Abstract] Summary of Significant Accounting Policies Accounting Changes and Error Corrections [Abstract] Impact of Recent Accounting Pronouncements Investments, Debt and Equity Securities [Abstract] Investment Securities Bank Stocks Bank Stocks Receivables [Abstract] Loans and Allowance for Loan Losses Loan Commitments [Abstract] Loan Commitments Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Property, Plant and Equipment [Abstract] Premises and Equipment Banking and Thrift [Abstract] Deposits Federal Home Loan Bank Borrowings Subordinated Debt [Abstract] Subordinated Debentures Debt Disclosure [Abstract] Other Borrowings Repurchase Agreements Income Tax Disclosure [Abstract] Income Taxes Retirement Benefits [Abstract] Employee Benefit Plans Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Stock Compensation Plan Fair Value Disclosures [Abstract] Fair Value of Financial Instruments and Fair Value Measurements Regulatory Capital Requirements Condensed Financial Information of Parent Company Only Disclosure [Abstract] Parent Company Condensed Financial Statements Commitments and Contingencies Disclosure [Abstract] Commitments, Contingencies and Guarantees Deposit-related Loss Deposit-Related Loss Principles of Consolidation Use of Estimates Business Combinations Reserve Requirements Cash Flows Investment Securities Bank Stocks Acquired Loans Loans Allowance for Loan Losses Loans Held for Sale Mortgage Servicing Rights Transfers of Financial Assets Mortgage Loan Repurchase Reserve Premises and Equipment Bank Owned Life Insurance Goodwill and Intangible Assets Income Taxes Loan Commitments and Related Financial Instruments Loss Contingencies Comprehensive Income Real Estate Owned Stock-Based Compensation Earnings Per Share Derivative Financial Instruments Dividend Restriction Fair Value of Financial Instruments Schedule of Earnings Per Share, Basic and Diluted Schedule of Available-for-sale Securities Schedule of Available for Sale Securities Continuous Unrealized Loss Position Fair Value Schedule of Investments Classified by Contractual Maturity Date Schedule of Realized Gain (Loss) Schedule of Loans Schedule of Allowance for Credit Losses On Financing Receivables Schedule of Impaired Financing Receivables Schedule of Past Due Financing Receivables Schedule of Risk Categories by Loan Class Schedule of Troubled Debt Restructurings On Financing Receivables Schedule of Loan to Directors Officers and Affiliated Parties Schedule of Intangible Assets and Goodwill Schedule of Finite-lived Intangible Assets, Future Amortization Expense Schedule of Participating Mortgage Loans Schedule of Servicing Asset at Amortized Cost Schedule of Premises and Equipment Schedule of Maturities of Time Deposit Schedule of Interest Expense Associated with Deposits Schedule of Maturities of Borrowings Schedule of Repurchase Agreements Schedule of Components of Income Tax Expense (Benefit) Schedule of Effective Income Tax Rate Reconciliation Schedule of Deferred Tax Assets and Liabilities Schedule of Unrecognized Tax Benefits Class of Stock [Axis] Schedule of Fair Value of Options Assumed Schedule of Share-based Compensation, Stock Options, Activity Schedule of Stock Option Exercised Additional Information Schedule of Share-based Compensation Arrangements by Share-based Payment Award Schedule of Nonvested Share Activity Schedule of Fair Value, by Balance Sheet Grouping Schedule of Fair Value, Assets Measured On Recurring Basis Schedule of Fair Value Contractual Balance and Gain Loss On Loans Held for Sale Schedule of Gains and Losses from Changes in Fair Value of Loans Held for Sale Schedule of Fair Value, Assets and Liabilities Measured On Nonrecurring Basis, Valuation Techniques Schedule of Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques Schedule of Compliance with Regulatory Capital Requirements for Mortgage Companies Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations Schedule of Condensed Financial Statements Income tax examination, likelihood of unfavorable settlement Employee service share-based compensation, decreased tax benefit realized from exercise of stock options Stock dividend percentage Net earnings available to common shareholders Weighted average common shares outstanding - basic Assumed exercise of stock options Weighted average common shares outstanding - diluted Employee service share-based compensation, tax benefit realized from exercise of stock options Federal corporate tax rate Income tax rate deduction percentage Security owned and pledged as collateral, fair value, total Equity method investment, ownership percentage Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Line Items] Amortized cost Gross unrealized gains Gross unrealized losses Estimated fair value No. of securities Fair value, Less than 12 months Unrealized losses, Less than 12 months Fair value, 12 months or longer Unrealized losses, 12 months or longer Total, Fair value Total, Unrealized losses Amortized cost, Due in less than one year Amortized cost, Due after one year but within five years Amortized cost, Due after five years but within ten years Amortized cost, Due after ten years Amortized cost, Common stocks Amortized cost, Total Estimated fair value, Due in less than one year Estimated fair value, Due after one year but within five years Estimated fair value, Due after five years but within ten years Estimated fair value, Due after ten years Estimated fair value, Common stocks Estimated fair value, Total Sales proceeds Realized gains Realized losses Net realized gains (losses) Bank Stocks Details Narrative Federal home loan bank stock Federal reserve bank stock Other assets, miscellaneous Impaired financing receivable loan balance charged off Nonaccrual loans , interest earned Loans receivable, gross, total Commercial agricultural loans receivable, gross Commercial real estate loans receivable, gross Loans receivable before fees, gross Loans and leases receivable, impaired, commitment to lend Provision for loan losses reversal Loans and leases receivable, allowance Total gross loans Net deferred loan costs and loans in process Allowance for loan losses Loans, net Balance Charge-offs Recoveries Provision for loan losses Balance Individually evaluated for loss Collectively evaluated for loss Total Individually evaluated for loss Collectively evaluated for loss Total Unpaid contractual principal Impaired loan balance Impaired loans without an allowance Impaired loans with an allowance Related allowance recorded Year-to-date average loan balance Year-to-date interest income recognized Financing Receivable, Recorded Investment, Past Due Loans, 90 days or more delinquent and accruing Loans, Total past due loans accruing Loans, Non-accrual loans Loan, Total past due and non-accrual loans Loan, Total loans not past due Percent of gross loans, 30-59 days delinquent and accruing Percent of gross loans, 60-89 days delinquent and accruing Percent of gross loans, 90 days or more delinquent and accruing Percentage of gross loans, Total past due loans accruing Percent of gross loans, Non-accrual loans Percentage of Total past due and non-accrual loans Percentage of Total loans not past due Loans and Leases Receivable, Gross, Total Troubled debt restructurings, Number of loans Financing Receivable, Modifications, Recorded Investment, Non Accrual Balance Financing Receivable, Modifications, Recorded Investment, Accruing Balance Balance New loans Repayments Balance Letters of credit outstanding, amount Standby letters of credit Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets [Line Items] Business Acquisition [Axis] Escrow deposit Interest and fee income, other loans Servicing asset at fair value, amount Assumption for fair value of assets or liabilities that relate to transferor's continuing involvement, discount rate Assumption for fair value of assets or liabilities that relate to transferor's continuing involvement, prepayment speed Assumption for fair value of interests continued to be held by transferor servicing assets or liabilities weighted average default rate Mortgage loans on real estate, write-down or reserve, amount Loss charged against reserve, amount Financing receivable, allowance for credit losses, recovery Credit provision Intangible assets, Gross carrying amount Intangible assets, Accumulated amortization Intangible assets, Net carrying amount 2018 2019 2020 2021 2022 Thereafter Total Mortgage Loans on Real Estate Schedule [Table] Mortgage Loans on Real Estate [Line Items] Mortgage loans on real estate, face amount of mortgages Balance at beginning of period Additions Amortization Balance at end of period Depreciation expense Land Office buildings and improvements Furniture and equipment Automobiles Total premises and equipment Accumulated depreciation Total premises and equipment, net Premises and equipment, estimated useful lives description Premises and equipment, estimated useful lives Time deposits in denominations during the period Time deposits in denominations of $250,000 or more 2018 2019 2020 2021 2022 Thereafter Total Time deposits Money market and checking Savings Total Advances from federal home loan banks Long-term line of credit Line of credit, description Line of credit accrued interest rate Debt variable rate Debt instrument, collateral amount Debt instrument maximum borrowing capacity amount Debt instrument, unused borrowing capacity, amount 2017 2018 Total 2017 - Weighted average rates 2018 - Weighted average rates Proceeds from issuance of debt Debt instruments, due date, year Debt instrument, description of variable rate basis Subordinated borrowing, interest rate Debt instrument, effective interest rate Line of credit facility, current borrowing capacity Line of credit facility maturing date Line of credit facility, interest rate description Line of credit facility maximum borrowing capacity Federal funds purchased Schedule of Assets Sold under Agreements to Repurchase [Table] Assets Sold under Agreements to Repurchase [Line Items] Customer Funds Debt Instrument, Collateral Amount Average daily balance during the year Average interest rate during the year Maximum month-end balance during the year Weighted average interest rate at year-end Assets Sold under Agreements to Repurchase, Carrying Amount Statutory federal income tax rate Deferred tax re-measurement Reclassification of certain tax effects from accumulated other comprehensive income Revised corporate federal rate Federal alternative minimum tax credit carry forward Net operating loss carryforwards Net operating loss carryforward expiration Cumulative effect on retained earnings, tax Unrecognized tax benefits Unrecognized tax benefits gross Unrecognized tax benefits that would impact effective tax rate Income tax examination, penalties and interest expense, total Unrecognized tax benefits, income tax penalties and interest accrued Reduction in unrecognized tax benefits Current Federal Current State Total current Deferred Federal Deferred State Total deferred Deferred tax valuation allowance Deferred tax remeasurement Income tax expense Computed “expected” tax expense Tax-exempt interest income, net Deferred tax remeasurement REIT excise tax Excess tax benefit from stock option exercise Bank owned life insurance Reversal of unrecognized tax benefits, net State income taxes, net of federal benefit Investment tax credits Other, net Federal alternative minimum tax credit and low income housing credit carry forwards Loans, including allowance for loan losses Net operating loss carry forwards State taxes Acquisition costs Intangible assets Deferred compensation arrangements Unrealized loss on investment securities available-for-sale Investments Investment impairments Other, net Total deferred tax assets Less valuation allowance Total deferred tax assets, net of valuation allowance Undistributed equity earnings Premises and equipment, net of depreciation Mortgage servicing rights Prepaid expenses FHLB stock dividends Other borrowings Other, net Total deferred tax liabilities Net deferred tax asset Unrecognized tax benefits at beginning of year Gross increases to current year tax positions Gross decreases to prior year’s tax positions Lapse of statute of limitations Unrecognized tax benefits at end of year Defined contribution plan, employer matching contribution, percent of employees gross pay Defined benefit plan, contributions by employer Deferred compensation liability Deferred compensation arrangements accrued benefits Deferred compensation expense Stock compensation vesting period description Share-based compensation, total Recognized tax benefit from compensation expense Maximum stock options exercise price of fair market value of shares on date of grant rate Common stock, capital shares reserved for future issuance Number of restricted common stock shares Share price Options to acquire shares Unrecognized share based compensation Number of nonvested options, outstanding Risk-free interest rate Expected term Expected stock price volatility Dividend yield Shares, Outstanding beginning Shares, Granted Shares, Effect of 5% stock dividend Shares, Forfeited/expired Shares, Exercised Shares, Outstanding ending Shares, Exercisable Shares, Fully vested options Weighted average exercise price per share, Outstanding beginning Weighted average exercise price per share, Granted Weighted average exercise price per share, Forfeited/expired Weighted average exercise price per share, Exercised Weighted average exercise price per share, Outstanding ending Weighted average exercise price per share, Exercisable Weighted average exercise price per share, Fully vested options Weighted average remaining contractual term beginning Weighted average remaining contractual term ending Weighted average remaining contractual term, Exercisable Weighted average remaining contractual term, Fully vested options Aggregate intrinsic value outstanding beginning Aggregate intrinsic value outstanding ending Aggregate intrinsic value, Exercisable Aggregate intrinsic value, Fully vested options Share based compensation effect of dividend percentage Intrinsic value of options exercised (on exercise date) Cash received from options exercised Excess tax benefit realized from options exercised 2018 2019 2020 2021 Total Nonvested restricted common stock, Beginning balance Nonvested restricted common stock, Granted Nonvested restricted common stock, Vested Nonvested restricted common stock, Forfeited Nonvested restricted common stock, Effect of 5% stock dividend Nonvested restricted common stock, Ending balance Impaired financing receivable, recorded investment, total Impaired financing receivable, related allowance Fair Value, by Balance Sheet Grouping [Table] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Investment securities available for sale Bank stocks, at cost Loans held for sale Derivative financial instruments Accrued interest receivable Non-maturity deposits Time deposits FHLB borrowings Subordinated debentures Other borrowings Accrued interest payable Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table] Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] Major Types of Debt and Equity Securities [Axis] Loans held for Sale Aggregate fair value Contractual balance Gain Interest income Change in fair value Total change in fair value Impaired loans Total (losses)/gains on impaired loans fair value disclosure Impaired Loans Fair Value Disclosure Real Estate Owned Fair Value Disclosure Fair Value Measurements, Valuation Techniques Fair Value Measurements, Unobservable inputs Fair Value Measurements Range Regulatory Capital Requirements [Table] Regulatory Capital Requirements [Line Items] Assets, total Common equity tier one risk based capital required for capital adequacy to risk weighted assets Tier one risk based capital required for capital adequacy to risk weighted assets Capital required for capital adequacy to risk weighted assets Tier one leverage capital required for capital adequacy to average assets Tier one capital conversation buffer Leverage - Actual Amount Common Equity Tier 1 Capital - Actual Amount Tier 1 Capital - Actual Amount Total Risk Based Capital - Actual Amount Leverage - Actual Ratio Common Equity Tier 1 Capital - Actual Ratio Tier 1 Capital - Actual Ratio Total Risk Based Capital - Actual Ratio Leverage - For capital adequacy purposes Amount Common Equity Tier 1 Capital - For capital adequacy purposes Amount Tier 1 Capital - For capital adequacy purposes Amount Total Risk Based Capital - For capital adequacy purposes Amount Leverage - For capital adequacy purposes Ratio Common Equity Tier 1 Capital - For capital adequacy purposes Ratio Tier 1 Capital - For capital adequacy purposes Ratio Total Risk Based Capital - For capital adequacy purposes Ratio Leverage - To be well-capitalized under prompt corrective action provisions Amount Common Equity Tier 1 Capital - To be well-capitalized under prompt corrective action provisions Amount Tier 1 Capital - To be well-capitalized under prompt corrective action provisions Amount Total Risk Based Capital - To be well-capitalized under prompt corrective action provisions Amount Leverage - To be well-capitalized under prompt corrective action provisions Ratio Common Equity Tier 1 Capital - To be well-capitalized under prompt corrective action provisions Ratio Tier 1 Capital - To be well-capitalized under prompt corrective action provisions Ratio Total Risk Based Capital - To be well-capitalized under prompt corrective action provisions Ratio Distributed dividends without regulatory approvals Investment securities Investment in subsidiaries Other Total assets Other Stockholders' equity Total liabilities and stockholders' equity Dividends from Bank Interest income Gain on sale of investment Other non-interest income Interest expense Other expense, net Earnings before equity in undistributed earnings Increase in undistributed equity of Bank Increase in undistributed equity of nonbank subsidiary Earnings before income taxes Income tax benefit Other comprehensive income (loss) Total comprehensive income Increase in undistributed equity of subsidiaries Gain on sale of investment Other Net cash provided by operating activities Investment in nonbank subsidiary Proceeds from sales and maturities of investment securities Net cash provided by investing activities Net cash used in financing activities Net increase (decrease) in cash Subsequent Event Type [Axis] Overdraft balance amount Collection amount provided Overdraft pre-tax loss Disclosure of accounting policy for acquired loans in business combination. Agency Mortgage Backed Securities [Member] Agriculture Loan [Member] Agriculture loans member. Agriculture [Member] Agriculture [Member] Amortization of purchase accounting adjustment on loans. Bank owned life insurance [Policy Text Block] Bank stocks, at cost. The entire disclosure for investment securities primarily consist of restricted investments in FHLB and Federal Reserve Bank ("FRB") stock. Disclosure of accounting policy for investments acquired for regulatory purposes and borrowing availability and are accounted for at cost. Banks Regulatory Capital Requirements [Member] Capital Conservation Buffer [Member] Commercial [Member] Common Stocks [Member] Companys Regulatory Capital Requirements [Member] Construction And Land [Member] Consumer [Member] Amount represents average daily securities payable under securities issued repurchase agreement during the year. Maximum borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. Amount represents maximum month end balance under securities issued repurchase agreement during the year. Deferred Compensation Agreements [Member] The balance of accrued benefits under split dollar deferred compensation plan arrangements. Amount of deferred tax consequences attributable to taxable temporary differences derived from other borrowings. It represents the compensation agreements of deferred tax assets. It represents the impairments of deferred tax assets investment. It represents the amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for loan losses. Deposit related loss. Deposit-Related Loss [Text Block] Disclosure of accounting policy for restrictions on dividends to be paid by the bank to the holding company or by the holding company to shareholders. Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to stock option exercise. Employee service share based compensation on unvested share-based awards, other than options, recognized in next fiscal year following the latest fiscal year. Employee service share based compensation on unvested share-based awards, other than options, recognized in the fourth fiscal year following the latest fiscal year. Employee service share based compensation on unvested share-based awards, other than options, recognized in the third fiscal year following the latest fiscal year. Employee service share based compensation on unvested share-based awards, other than options, recognized in the second fiscal year following the latest fiscal year. The range of Level 3 fair value measurements for impaired loans measured at fair value on a non-recurring basis. Fair Value Of Financial Instruments And Fair Value Measurements Line Items Fair Value Of Financial Instruments And Fair Value Measurements [Table] Other Securities includes Federal Home Loan Bank (FHLB) and Federal Reserve Bank. FHLB Stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity) and Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). It represents the federal home loan bank stock dividends. Gain Loss On Impaired Loans Fair Value Disclosure Represent the value of gain or loss on loans held for sale. Greater Than Ninety Days [Member] This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as impaired loans disclosure. It represents the expected income tax expenses during the year. Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to Bank owned life insurance. It represents the income tax reconciliation unrecognized tax benefits. Investment securities purchases not yet settled. January One Two Thousand And Nineteen [Member] The entire disclosure for collateral or other security on unfunded loan commitments and irrevocable letters of credit. Change in fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. Loans Receivables Classified [Member] Loans Receivables Non Classified [Member] Disclosure of accounting policy for mortgage loan repurchase reserve. Mortgage Loans Serviced [Member] Mortgage Repurchase Reserve [Member] Mortgage Servicing Rights Member. Municipal [Member] Municipal Obligations Tax Exempt [Member] Municipal Obligations Taxable [Member] Net operating loss carryforward expiration. The aggregate amount of non-maturity deposits liabilities held by the entity. One To Four Family Residential Real Estate [Member] Overnight And Continuous [Member] The percentage rate used to calculate stock dividend payments. Represents the amount of real estate owned fair value disclosure. The reduction in gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date. Disclosure of accounting policy for the regulations of the Federal Reserve require reserves to be maintained by all banking institutions according to the types and amounts of certain deposit liabilities. Schedule of Risk Categories by Loan Class [Table Text Block] Schedule of Fair Value Contractual Balance and Gain Loss On Loans Held for Sale [Table Text Block] Schedule of Gains and Losses from Changes in Fair Value of Loans Held for Sale [Table Text Block] Tabular disclosure of loan to directors officers and affiliated parties. Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all time deposit for each of the five years following the date of the latest balance sheet date presented Tabular disclosure of additional information for stock option exercised. Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Sixty To Eighty Nine Days Delinquent And Accruing [Member] Small Bank Holding Companies [Member] Split Dollar Life Insurance Agreement [Member] Subordinated Debentures 2005 [Member] Subordinated Debentures 2013 [Member] Subordinated Debentures 2003 [Member] TDR [Member] Third Party [Member] Thirty To Fifty Nine Days Delinquent And Accruing [Member] Thirty To Ninety Days [Member] Trouble Debt Restructurings [Member] 2015 Stock Incentive Plan [Member] US Federal Agency Obligations [Member] Upto Thirty Days [Member] Deferred tax remeasurement. Deferred tax liabilities undistributed equity earnings. Employee service share-based compensation, decreased tax benefit realized from exercise of stock options. Accounting Standards Update 2018-02 [Member] US Federal Treasury Securities [Member] Four Agriculture Loans [Member] Impaired Financing Receivable Recorded Rounded. Amount of loan losses provision reversed. Represents the net amount of deferred loan costs and loans in process. Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. Recorded investment in Financing receivables that are 30 days or more past due and accruing, total. Recorded investment that are past due including non accrual status. Percentage amount of financing receivables that are less than 60 days past due but more than 29 days past due. Percentage amount of financing receivables that are less than 90 days past due but more than 59 days past due. Percentage amount of Recorded investment in financing receivables that are 90 days or more past due and still accruing. Percentage amount of Recorded investment in financing receivables that are 30 days or more past due and accruing, total. Percentage amount of Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. Percentage of recorded investment that are past due including non accrual status. Percentage of financing receivables that are current. The amount of the outstanding recorded investment related to accruing balance of financing receivables that have been modified by troubled debt restructurings. The total amount of the contingent obligation under standby letters of credit outstanding as of the reporting date. Weighted average default rate which is used to value residual cash flows generated by financial assets of a securitization, asset-backed financing arrangement, or similar transfer regardless of when the transfer occurred. Credit provision. Real Estate Owned One-To-Four Family Residential Real Estate [Member] Real Estate Owned Commercial Real Estate [Member] Regulatory Capital Requirements [Table] Regulatory Capital Requirements Line Items The minimum common equity Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. The percentage of capital buffer to be maintained other than minimum capital requirements. The amount of total common equity tier 1 capital as defined in the regulations. Common equity Tier 1 capital divided by risk weighted assets as defined by regulations. The minimum amount of common equity total capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. The amount of common equity Tier 1 Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. The common equity tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. It represents the increase or decrease undistributed earnings In during the reporting period. Collection amount privided to cover overdraft. Interest Income Loans [Abstract] Interest income derived from loans which are subject to federal income taxes. Interest income derived from loans which are exempt from federal income taxes. Commercial Loans [Member] Municipal Loans [Member] Consumer Loans [Member] Construction and Land Loans [Member] Commercial Real Estate Loans [Member] Tabular disclosure of interest expense for each period. Unrelated Financial Institution [Member] Increase in undistributed equity of subsidiaries. Overdraft pre-tax loss. Income Tax Reconciliation REIT Excise Tax. Increase in undistributed equity of nonbank subsidiary. Commercial Real Estate [Member] Commercial Loan [Member] AgricultureOneMember Deposits [Default Label] Liabilities Interest Income, Securities, Operating, Taxable Interest Income, Securities, Operating, Tax Exempt Interest and Dividend Income, Operating Interest Expense, Subordinated Notes and Debentures Interest Expense Interest Income (Expense), Net Interest Income (Expense), after Provision for Loan Loss Noninterest Income Other Noninterest Expense Noninterest Expense Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax Other Comprehensive Income (Loss), Tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Dividends, Common Stock, Cash Accretion (Amortization) of Discounts and Premiums, Investments Risk Categories By Loan Class [Table Text Block] Gain (Loss) on Disposition of Property Plant Equipment Payments for Origination and Purchases of Loans Held-for-sale Increase (Decrease) in Other Operating Assets Payments for (Proceeds from) Loans and Leases Payments to Acquire Available-for-sale Securities Payments to Acquire Other Investments Payment to Acquire Life Insurance Policy, Investing Activities Payments to Acquire Property, Plant, and Equipment Repayments of Federal Home Loan Bank Borrowings Repayments of Other Debt Payments of Ordinary Dividends, Common Stock Bank Stocks Disclosure [Text Block] Deposit Liabilities Disclosures [Text Block] Investment, Policy [Policy Text Block] Bank Stocks [Policy Text Block] Property, Plant and Equipment, Policy [Policy Text Block] Goodwill and Intangible Assets, Policy [Policy Text Block] Income Tax, Policy [Policy Text Block] Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Available-for-sale Securities, Gross Realized Losses Available-for-sale Securities, Gross Realized Gain (Loss) Allowance for Loan and Lease Losses, Write-offs Provision for Loan and Lease Losses Financing Receivable, Individually Evaluated for Impairment Financing Receivable, Collectively Evaluated for Impairment Loans and Leases Receivable, Related Parties Loans and Leases Receivable, Related Parties, Proceeds Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets, Net Servicing Asset at Amortized Cost Servicing Asset at Amortized Cost, Amortization Property, Plant and Equipment, Gross Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Time Deposit Maturities, Next Rolling Twelve Months Time Deposit Maturities, Year Two Time Deposit Maturities, Year Three Time Deposit Maturities, Year Four Time Deposit Maturities, Year Five Time Deposit Maturities, after Year Five Time Deposits Maturities, after Next Twelve Months Interest Expense, Negotiable Order of Withdrawal (NOW) Deposits Interest Expense, Savings Deposits Federal Home Loan Bank, Advances, Maturities Summary, Due in Year Two Current Income Tax Expense (Benefit) Deferred Income Taxes and Tax Credits Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Effective Income Tax Rate Reconciliation , Stock Option Exercise Income Tax Reconciliation, Bank Owned Life Insurance Income Tax Reconciliation Unrecognized Tax Benefits Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount Deferred Tax Assets, Other Deferred Tax Assets, Gross Deferred Tax Assets, Valuation Allowance Deferred Tax Assets, Net of Valuation Allowance Deferred Tax Liabilities Other Borrowings Deferred Tax Liabilities, Other Deferred Tax Liabilities, Gross Deferred Tax Assets, Net Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptionsCurrent Employee Service Share-based Compensation, Nonvested Awards, Compensation Recognized, Share-based Awards Other than Options In Two Year Employee Service Share-based Compensation, Nonvested Awards, Compensation Recognized, Share-based Awards Other than Options In Three Year Employee Service Share-based Compensation, Nonvested Awards, Compensation Recognized, Share-based Awards Other than Options In Four year Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Federal Home Loan Bank and Federal Reserve Bank Stock Securities Non Maturity Deposits Interest Payable Loans Held-for-sale, Change In Fair Value Fair Value, Option, Changes in Fair Value, Gain (Loss) Other Assets Other Liabilities Investment Income, Interest Proceeds from Other Operating Activities