Amounts Reclassified from AOCI [Abstract] AOCI Attributable to Parent [Abstract] Award Type [Axis] ASU 2016-13 [Member] Accounting Standards Update 2016-13 [Member] ASU 2016-02 [Member] Summary of Significant Accounting Policies [Abstract] Accrued interest payable COVID-19 [Abstract] Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract] Accounts, Notes, Loans and Financing Receivable [Line Items] Amortization of securities premiums and discounts, net Accretion (Amortization) of Discounts and Premiums, Investments Accumulated Other Comprehensive Income (Loss), Net of Tax [Member] AOCI Attributable to Parent [Member] Accumulated other comprehensive income, net of tax Accumulated Other Comprehensive Income (Loss), Net of Tax Unrealized Gains on AFS Securities [Member] AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] Accumulated Other Comprehensive Income [Abstract] Capital Surplus [Member] Capital surplus Stock-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Adjustments to reconcile net income to net cash provided by operating activities: Adjustments for New Accounting Pronouncements [Axis] Advances from Federal Home Loan Bank Advances from Federal Home Loan Banks Losses charged off Allowance for Loan and Lease Losses, Write-offs Allowance for loan losses [Roll Forward] Recoveries Allowance for Loan and Lease Loss, Recovery of Bad Debts Activity in Allowance for Credit Losses and Allowance for Loan and Lease Losses Options excluded from diluted calculations (in shares) Antidilutive Securities [Axis] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities, Name [Domain] Assets Measured at Fair Value on Recurring Basis [Abstract] Assets: Total assets Assets Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Gross unrealized losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Securities available-for-sale (AFS): Available-for-sale, gross unrealized losses [Abstract] Amortized cost Debt securities available-for-sale at amortized cost Available-for-sale [Abstract] Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] Gross unrealized gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Due after ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Due after ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Available-for-sale, fair value [Abstract] Available for sale, fair value [Abstract] Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] Due after one through five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Available-for-sale, amortized cost [Abstract] Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract] Due after five through ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Due after one through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Due after five through ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Due in one year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Debt securities available-for-sale at fair value (amortized cost of $931,919 and $593,945, respectively) Fair value Fair value Debt securities available-for-sale Gains (Loss) on Sales of Securities [Abstract} Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] Without single maturity date Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost Without single maturity date Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Bank owned life insurance Bank Owned Life Insurance Income Bank owned life insurance Brokerage revenue Criticized [Member] Carrying Amount [Member] Cash and due from banks Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Cash and cash equivalents Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Certificates of deposit in other banks Certificates of Deposit, at Carrying Value Collateral Pledged [Member] Collateral [Domain] Collateral [Axis] Commercial [Member] Commercial Loan [Member] Commercial [Member] Common Stock [Member] Dividends declared per share (in dollars per share) Common stock, par value (in dollars per share) Common stock, shares authorized (in shares) Common stock, $5 par value, shares authorized 25,000,000; shares outstanding 2020 - 17,802,012; 2019 - 17,793,165 Common Stock, Value, Outstanding Common stock, shares outstanding (in shares) Balance (in shares) Balance (in shares) Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Principles of Consolidation Consolidation, Policy [Policy Text Block] Construction [Member] Construction Loans [Member] Consumer [Member] Consumer Loan [Member] Receivable accounts for contracts with customers Contract with Customer, Receivable, after Allowance for Credit Loss Contract liabilities Contract with Customer, Liability Contract assets Contract with Customer, Asset, after Allowance for Credit Loss Rate Modification [Member] Contractual Interest Rate Reduction [Member] Credit Loss Status [Domain] Credit Loss Status [Axis] Allowance for Credit Losses Doubtful [Member] Change in fair market value of equity securities Unrealized gain from fair market value adjustment of equity securities Total Debt Securities, Available-for-sale, Unrealized Loss Position Total Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 12 months or more Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Less than 12 months Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Securities gains, net Debt Securities, Available-for-sale, Realized Gain (Loss) Realized pre-tax loss on sales and calls of AFS securities Debt 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Equity Component [Domain] Equity securities at fair value Equity Securities, FV-NI Equity Securities [Member] Fair Value [Member] Estimate of Fair Value Measurement [Member] Term Modification [Member] Extended Maturity [Member] COVID-19 and CARES Act Loan Activities [Abstract] Total unrealized gains (losses) included in net income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Total gains (losses) for the period included in net income attributable to the change in unrealized gains or losses related to assets still held at the reporting date Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] Fair Value Measurement Inputs and Valuation Techniques [Abstract] Asset Class [Domain] Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Recurring [Member] Fair Market Value of Financial Assets and Liabilities [Abstract] Quantitative Information About Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Issues Asset Class [Axis] Fair Value, Measurement Frequency [Domain] Measurement Frequency [Axis] Nonrecurring [Member] Measurement Basis [Axis] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Market Value of Financial Assets and Liabilities Realized and Unrealized Gains and Losses for Items Included in Net Income in the Consolidated Statements of Income Fair Value Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Fair Value Measurements of Recognized Assets Measured on Nonrecurring Basis Fair Value, 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Fair Value, Inputs, Level 3 [Member] Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value FDIC insurance Federal funds purchased Federal Home Loan Bank stock Federal funds purchased Federal Funds Purchased and Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure Advances from Federal Home Loan Bank Federal Home Loan Bank Borrowings, Fair Value Disclosure Federal Reserve Bank stock Federal Reserve Bank stock Finance lease liability Payment of finance lease liabilities Finance Lease, Principal Payments Loans Financing Receivable, Held-for-investment [Policy Text Block] Financial Instrument Performance Status [Domain] Financial Instrument Performance Status [Axis] Financial Instruments Pledged as Collateral [Abstract] Financial Instrument [Axis] Financial liabilities [Abstract] Financial assets [Abstract] Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Financing Receivable, Recorded Investment, Past Due [Line Items] Financial Asset, Period Past Due [Axis] Pre-Modification Outstanding Recorded Investment Financing Receivable, Troubled Debt Restructuring, Premodification Defaulted restructured loans, recorded balance 2017 Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 60-89 Days Past Due [Member] Financial Asset, 60 to 89 Days Past Due [Member] Charge off threshold for loans considered uncollectible Financing Receivable, Threshold Period Past Due, Writeoff Financial Asset, Period Past Due [Domain] Total Past Due Financing Receivable, Past Due 90+ Days Past Due [Member] Financial Asset, Equal to or Greater than 90 Days Past Due [Member] 2019 Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 2016 Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 30-59 Days Past Due [Member] Financial Asset, 30 to 59 Days Past Due [Member] 2018 Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year Number of Loans Post-Modification Outstanding Balance Financing Receivable, Troubled Debt Restructuring, Postmodification Nonaccrual loans segregated by class of loans [Abstract] Bank's Loan portfolio aging analysis, segregated by class [Abstract] Revolving Loans Financing Receivable, Revolving Nonaccrual loans with no ACL Financing Receivable, Nonaccrual, No Allowance Financing Receivable Portfolio Segment [Axis] 2020 Financing Receivable, Year One, Originated, Current Fiscal Year Class of Financing Receivable, Type [Axis] Current Prior Financing Receivable, Originated, More than Five Years before Current Fiscal Year Defaulted restructured loans, number of loans Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts Recoveries Nonaccrual loans with ACL Financing Receivable, Nonaccrual Financing Receivable Portfolio Segment [Domain] Individually evaluated for impairment Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Class of Financing Receivable, Type [Domain] Financing Receivable, Recorded Investment [Line Items] 90+ and still accruing 90+ and Accruing Allowance for Credit Losses [Roll Forward] Financing Receivable, Allowance for Credit Loss [Roll Forward] Increase (decrease) in allowance for credit loss balance Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) Ending balance [Abstract] Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] Effect of adoption of ASU in allowance for credit losses Financing Receivable, Allowance for Credit Losses, Effect of Change in Method Financing Receivable, Allowance for Credit Loss [Line Items] Collectively evaluated for impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Credit Risk Profile of the Bank's Commercial Loan Portfolio Based on Rating Category and Payment Activity, Segregated by Class of Loans Collectively evaluated for impairment Financing Receivable, Collectively Evaluated for Impairment Individually evaluated for impairment Financing Receivable, Individually Evaluated for Impairment Financing Receivable, Impaired [Line Items] Losses charged off Financing Receivable, Allowance for Credit Loss, Writeoff Beginning balance Ending balance Financing Receivable, Allowance for Credit Loss Financing Receivable, Modifications [Line Items] Major Classifications of Foreclosed Properties [Abstract] Repossessed Assets [Abstract] Repossession expense Foreclosed Real Estate Expense Total gains (losses) Gain (Loss) on Investments, Excluding Other than Temporary Impairments Gain on debt repurchase Gain (Loss) on Repurchase of Debt Instrument Gains (losses) on sale of assets, net Gain (Loss) on Disposition of Property Plant Equipment Gains on sales of loans, net Gains on sale of mortgage loans held for sale Goodwill Debt securities held-to-maturity at amortized cost (fair value of $0 and $517, respectively) Amortized cost Securities held-to-maturity Gross unrealized losses Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss Held-to-maturity [Abstract] Securities held-to-maturity (HTM): Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] Amortized Cost and Fair Value of Held-to-maturity Securities Debt Securities, Held-to-maturity [Table Text Block] Gross unrealized gains Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain Fair value Debt securities held-to-maturity at fair value Debt securities held-to-maturity Home Equity Lines [Member] Home Equity Line of Credit [Member] Average Investment in Impaired Loans Impaired Financing Receivable, Average Recorded Investment Interest Income Recognized Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method Collateral Dependent Loans and Loans With/Without Specific Valuation Allowance Interest Income Recognized Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method Average Investment in Impaired Loans Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment Specific Allowance Specific Allowance Impaired Financing Receivable, Related Allowance Average Investment in Impaired Loans Impaired Financing Receivable, with Related Allowance, Average Recorded Investment Interest Income Recognized Recorded Balance Impaired Financing Receivable, with Related Allowance, Recorded Investment Unpaid Contractual Principal Balance Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance Unpaid Contractual Principal Balance Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance Recorded Balance Impaired Financing Receivable, with No Related Allowance, Recorded Investment Recorded balance Unpaid Contractual Principal Balance Valuation, Income Approach [Member] Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Condensed Consolidated Statements of Income and Comprehensive Income (unaudited) [Abstract] Income taxes Tax expense Income Taxes Income Tax, Policy [Policy Text Block] Income taxes paid Increase (Decrease) in fair market value of equity securities Accrued interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Change in deposits, net Change in repurchase agreements and federal funds purchased, net Accrued interest payable Increase (Decrease) in Interest Payable, Net Other assets Increase (Decrease) in Other Operating Assets Changes in: Change in cash surrender value of bank owned life insurance Other liabilities Increase (Decrease) in Other Operating Liabilities Increase (Decrease) in Stockholders' Equity [Roll forward] Effect of dilutive stock options and restricted stock grants (in shares) Data processing Interest and fees on loans, including loans held for sale Total interest income Interest and Dividend Income, Operating Interest and dividends on securities Accrued interest payable Interest Payable Total interest expense Interest Expense Interest expense: Interest on repurchase agreements and federal funds purchased Interest Expense, Federal Funds Purchased and Securities Sold under Agreements to Repurchase Interest on long-term debt Interest on deposits Interest on advances from Federal Home Loan Bank Interest income: Tax exempt Net interest income after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Other, including interest on federal funds sold Interest Income, Federal Funds Sold Net interest income Interest Income (Expense), Net Taxable Interest paid Accrued interest receivable Interest bearing Interest bearing deposits Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Federal Home Loan Bank stock Investment in Federal Home Loan Bank Stock, Fair Value Disclosure Securities [Abstract] Amortized Cost and Fair Value of Debt Securities by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Securities Long-term debt Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust Legal fees Total liabilities and shareholders' equity Liabilities and Equity Liabilities and shareholders' equity: Total liabilities Liabilities Loan Restructuring Modification [Domain] Loan Restructuring Modification Name [Axis] Loan Restructuring Modification [Axis] Loan Restructuring Modification Name [Domain] Loans [Abstract] Loans and Leases Receivable Disclosure [Abstract] Loans held for sale Loans held for sale Loans Insured or Guaranteed by Government Authorities [Domain] Loans Insured or Guaranteed by Government Authorities [Axis] Allowance for credit losses Beginning balance Ending balance Amount Loans and Leases Receivable, Allowance Commitment to extend additional credit on loans modified in TDRs Financing Receivable, Troubled 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[Member] Probability of Default [Member] Dividend Rate [Member] Measurement Input, Expected Dividend Rate [Member] Measurement Input Type [Domain] Constant Prepayment Rate [Member] Comparability Adjustment [Member] Measurement Input Type [Axis] Conversion Rate [Member] Measurement Input, Conversion Price [Member] Discount Rate [Member] Consumer mortgage loans secured by real estate properties for which formal foreclosure proceedings are in process Mortgage Loans in Process of Foreclosure, Amount Fair value adjustments U.S. Government Sponsored Agency Mortgage-backed Securities [Member] Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Nonperforming [Member] Nonperforming Financial Instruments [Member] Numerator [Abstract] Net Income (Loss) Attributable to Parent [Abstract] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Net income Net income Net income Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from operating activities: Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Cash flows from financing activities: Adjustments for New Accounting Pronouncement [Member] New Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] New Accounting Standards [Abstract] Noninterest bearing Total noninterest expense Noninterest Expense Total noninterest income Noninterest Income Noninterest expense: Other noninterest income Noninterest income: Total Financing Receivable, before Allowance for Credit Loss Number of operating segments Occupancy, net Officer salaries and employee benefits Payment of operating lease liabilities Operating Lease, Payments Operating lease liability Operating Lease, Liability Right-of-use asset Summary of Significant Accounting Policies Other real estate 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other real estate owned Beginning balance of other real estate owned Other Real Estate, Foreclosed Assets, and Repossessed Assets Other comprehensive income, net of tax Other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Tax expense Other comprehensive income, tax Performing [Member] Bank's Loan Portfolio Aging Analysis, Segregated by Class Financing Receivable, Past Due [Table Text Block] Pass [Member] Change in loans, net Payments for (Proceeds from) Loans and Leases Repurchase of common stock Payments for Repurchase of Common Stock Purchase of AFS securities Payments to Acquire Available-for-sale Securities Dividends paid Payments of Dividends Additional investment in bank owned life insurance Payment to Acquire Life Insurance Policy, Investing Activities Purchase of premises and equipment Payments to Acquire Property, Plant, and Equipment Funding of mortgage loans held for sale Payments to Purchase Mortgage Loans Held-for-sale Plan Name [Axis] Plan Name [Domain] Carrying value of investment securities available-for-sale pledged as collateral under repurchase agreements Securities pledged as collateral to secure public deposit and for other purposes Pledged Financial Instruments, Not Separately Reported, Securities Portion at Fair Value Measurement [Member] [Default] Preferred stock, 300,000 shares authorized and unissued Preferred stock, shares authorized (in shares) Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Redemption of stock by Federal Home Loan Bank Issuance of common stock Proceeds from Federal Home Loan Bank advances Proceeds from settlement of bank owned life insurance Proceeds from maturities of HTM securities Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Proceeds from prepayments and maturities of AFS securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Proceeds from the sales of AFS securities Proceeds from sale of other real estate and repossessed assets Proceeds from Sale of Wholly Owned Real Estate and Real Estate Acquired in Settlement of Loans Proceeds from sale of mortgage loans held for sale Proceeds from sale and retirement of premises and equipment Professional fees Premises and equipment, net Provision charged to expense Provision for Loan and Lease Losses Allocations to allowance for credit losses Provision for credit losses Provision charged to expense Total foreclosed properties Real Estate Mortgage [Member] Residential Mortgage [Member] Real Estate [Member] Other Real Estate Owned [Abstract] Other Real Estate Owned Sale of assets SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Cost of Investment in Real Estate Sold Loans held for sale [Abstract] Loans [Abstract] Amounts Reclassified from Accumulated Other Comprehensive Income (AOCI) Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification Out of Accumulated Other Comprehensive Income [Member] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Activity for other real estate owned [Roll Forward] SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward] Repurchase of long-term debt Repayments of Other Long-term Debt Payments on advances from Federal Home Loan Bank Payments of FHLBank Borrowings, Financing Activities Repurchase Agreements Repurchase Agreements, Resale Agreements, Securities Borrowed, and Securities Loaned Disclosure [Text Block] Residential [Member] Residential Loan [Member] Residential [Member] Restricted Stock [Member] Restricted Stock [Member] Retained earnings Retained Earnings [Member] Revenue Recognition Revenue Recognition [Abstract] Substandard [Member] Other salaries and employee benefits Salary and Wage, NonOfficer, Excluding Cost of Good and Service Sold Schedule of Impaired Financing Receivable [Table] Available for Sale Securities and Held-to-Maturity Securities, Continuous Unrealized Loss Position Schedule of Unrealized Loss on Investments [Table Text Block] Impact of Adoption of ASU 2016-13 by Major Loan Classifications Schedule of Prospective Adoption of New Accounting Pronouncements [Table Text Block] Amortized Cost and Fair Value of Available-for-sale Securities Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Schedule of Financing Receivables Past Due [Table] Nonaccrual Loans Segregated by Class of Loans Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Computation of Basic and Diluted Earnings Per Share Schedule of Financing Receivable, Troubled 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Repurchase agreements and repurchase-to-maturity transactions Securities Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement Repurchase agreements Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure Securities Sold under Agreements to Repurchase [Member] Repurchase agreements Mortgage servicing rights Servicing Asset at Fair Value, Amount Mortgage servicing rights, measurement input Mortgage servicing rights Stock-based Compensation [Abstract] Share-based Payment Arrangement, Noncash Expense [Abstract] Stock based compensation expense Stock-based compensation Options granted to purchase shares of CTBI common stock (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Granted 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Stock Issued During Period, Value, Restricted Stock Award, Gross Repurchase of common stock (in shares) Stock Repurchased During Period, Shares Repurchase of common stock Stock Repurchased During Period, Value Accumulated Other Comprehensive Income Total shareholders' equity Equity, net of tax Balance Balance Stockholders' Equity Attributable to Parent Shareholders' equity: Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event [Member] Supplemental disclosures: Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Table] Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] Financial Instruments [Domain] Troubled Debt Restructuring Type of Adoption [Domain] Unfunded Commitment [Member] Unfunded Loan Commitment [Member] Unusual or Infrequent Item, or Both [Domain] Unusual or Infrequent Item, or Both [Table] Unusual or Infrequent Item, or Both [Axis] Unusual or Infrequent Item, or Both [Line Items] COVID-19 and CARES Act Loan Activities Critical Accounting Policies and Estimates State and Political Subdivisions [Member] State and Political Subdivisions [Member] U.S. Treasury and Government Agencies [Member] U.S. Treasury and Government Agencies [Member] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Axis] Weighted average shares outstanding-basic (in shares) Weighted average shares (in shares) Weighted average shares outstanding-diluted (in shares) Adjusted weighted average shares (in shares) Denominator [Abstract] Weighted Average Number of Shares Outstanding, Diluted [Abstract] Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption, Adjustment [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] Multifamily [Member] Maximum [Member] Minimum [Member] Real Estate [Domain] Real Estate, Type of Property [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Weighted Average [Member] Cover [Abstract] Entity Address, Address Line One Entity Address, Address Line Two Amendment Flag City Area Code Entity Address, City or Town Current Fiscal Year End Date Document Period End Date Entity Incorporation, State or Country Code Local Phone Number Entity Address, Postal Zip Code Entity Address, State or Province Title of 12(b) Security Trading Symbol Security Exchange Name Entity Current Reporting Status Entity Filer Category Entity Registrant Name Entity Central Index Key Entity Tax Identification Number Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Document Type Document Quarterly Report Document Transition Report Entity Interactive Data Current Entity File Number Entity Shell Company Entity Emerging Growth Company Entity Small Business A share-based compensation plan approved by the Board of Directors and the Shareholders in 2015. Stock Ownership Incentive 2015 Plan [Member] 2015 Plan [Member] Stock including a provision that prohibits sale or substantive sale of an equity instrument for a specified period of time or until specified performance conditions are met. Management Retention Restricted Stock [Member] Management Retention Restricted Stock [Member] Amount of interest income and dividend income on Federal Reserve Bank and Federal Home Loan Bank stock. Interest and Dividend Income on Federal Reserve Bank and Federal Home Loan Bank Stock Interest and dividends on Federal Reserve Bank and Federal Home Loan Bank stock Tax assessed on banks in Kentucky in lieu of an income tax and is based on the equity of the bank (as defined by regulation). Bank Franchise Tax Bank franchise tax Amortization expenses related to the investments in low income housing and other community related limited partnerships. Amortization of Investment in Low Income Housing Limited Partnerships Amortization of limited partnership investments The non-interest income earned from monthly or quarterly fees due from wealth management customers as consideration for managing the customers' assets, including custody of assets, investment management, escrow services, fees for trust services, and similar fiduciary activities. Trust and Wealth Management Income Trust and wealth management income The non-interest income earned from loan related fees. Loan Related Fees Loan related fees The non-interest income earned through general service fees for monthly account maintenance and activity- or transaction-based fees, consisting of transaction-based revenue, time-based revenue (service period), item-based revenue or some other individual attribute-based revenue. Service Charges On Deposit Accounts Service charges on deposit accounts Amount of interest income from interest-bearing funds deposited into Federal Reserve Bank. Interest Income, Deposits with Federal Reserve Bank Interest on Federal Reserve Bank deposits Class of financing receivable related to other commercial purpose loans. Commercial Other [Member] Commercial Other [Member] Other [Member] Loans to finance real estate mortgage including real estate construction. Real Estate Mortgage [Member] Class of financing receivable related to consumer direct financing loans. Consumer Direct [Member] Consumer Direct [Member] Class of financing arrangement to finance the purchase of dealer floorplans. Dealer Floorplans [Member] Dealer Floorplans [Member] Loans to finance commercial check loans, agricultural loans, receivable financing, loans to financial institutions, loans for purchasing or carrying securities, and other commercial purpose loans. Commercial Other 2 [Member] Commercial Other [Member] Class of financing arrangement to finance the purchase of commercial nonresidential real estate. Commercial Real Estate Nonresidential [Member] Commercial Real Estate Nonresidential [Member] Class of financing arrangement to finance the purchase of hotel/motel. Hotel/motel [Member] Hotel/Motel [Member] Class of financing arrangement to finance the purchase of commercial residential real estate. Commercial Real Estate Residential [Member] Commercial Real Estate Residential [Member] Class of financing receivable related to consumer indirect financing loans. Consumer Indirect [Member] Consumer Indirect [Member] The VISA class B restricted stock. Class B Restricted Stock [Member] Visa Class B Restricted Stock [Member] Number of equity securities sold during the period. Number of Equity Securities Sold Number of equity securities sold (in shares) Percentage of the total loan portfolio. Percentage of Loan Percentage of total loan The Paycheck Protection Program ("PPP") established by the CARES Act resulting in a new loan segment of unsecured commercial other loans that are one hundred percent guaranteed by the Small Business Administration ("SBA"). These loans, which are subject to forgiveness, have a maturities of either two or three to five years, depending on when the loan was made. Commercial Unsecured SBA Paycheck Protection Program [Member] Commercial Unsecured SBA PPP [Member] Class of financing arrangement to finance equipment leases. Equipment Lease Financing [Member] Equipment Lease Financing [Member] Equipment Leases [Member] Number of portfolio segments through which the Company segregates and evaluates its loan portfolio. Number of Portfolio Segments Number of portfolio segments Refers to the real estate acquired in settlement of loans. Real estate acquired in settlement of loans Real estate acquired in settlement of loans Refers to the common stock dividends accrued, paid in subsequent quarter. Common stock dividends accrued, paid in subsequent quarter Common stock dividends accrued, paid in subsequent quarter Loans to facilitate the sale of other real estate owned. Loans to facilitate sale of other real estate owned Loans to facilitate the sale of other real estate owned Mortgage servicing rights [Abstract] Mortgage servicing rights: Amount of expense recognized in the income statement for write-down of other real estate owned (OREO). Other Real Estate Owned Writedowns Write-downs of other real estate owned Interest Bearing Deposits In Banks [Abstract] Certificates of deposit in other banks: The cash inflow associated with the maturity of interest bearing deposits in banks. Proceeds from Maturities of Certificates of Deposit Maturity of certificates of deposit Amount of increase (decrease) to contract to service financial assets during the period. Servicing Asset at Amortized Cost, Increase (Decrease) in Servicing Assets New servicing assets created Tabular disclosure of the number and balance of defaulted financing receivables. Summary of defaulted restructured loans [Table Text Block] Defaulted Restructured Loans Tabular disclosure of financing receivables of residential real estate and consumer loan portfolios based on performing and nonperforming status segregated by class. Credit risk profile of residential real estate and consumer loan portfolio based on performing and nonperforming status segregated by class [Table Text Block] Credit Risk Profile of Residential Real Estate and Consumer Loan Portfolio Based on Performing and Nonperforming Status Segregated by Class Number of loans closed under Payment Protection Program (PPP). Financing Receivable, Number of Loans Closed Number of loans closed Represents the amount of deferred loans. Financing Receivable, Amount of Deferred Loans Amount of loan deferrals Small Business Administration (SBA), CARES Act, Paycheck Protection Program loans of $50 thousand or less. Small Business Administration (SBA), CARES Act, Paycheck Protection Program 4 [Member] PPP Loans of $50 Thousand or Less [Member] Represents the number of deferred loans. Financing Receivable, Number of Deferred Loans Number of loan deferrals Number of loans fall under Payment Protection Program (PPP). Financing Receivable, Number of Loans Number of PPP loans The novel coronavirus (COVID-19) categorized as a pandemic by the World Health Organization. COVID-19 [Member] Amount of loans closed under Payment Protection Program (PPP). Financing Receivable, Amount of Loans Closed Amount of loans closed Amount of loans fall under Payment Protection Program (PPP). Financing Receivable, Amount of Loans Amount of PPP loans Small Business Administration (SBA), CARES Act, Paycheck Protection Program loans. Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member] Paycheck Protection Program [Member] Small Business Administration (SBA), CARES Act, Paycheck Protection Program loans between $350 thousand and $2.0 million. Small Business Administration (SBA), CARES Act, Paycheck Protection Program 2 [Member] PPP Loans Between $350 Thousand and $2.0 Million [Member] Small Business Administration (SBA), CARES Act, Paycheck Protection Program loans over $2.0 million. Small Business Administration (SBA), CARES Act, Paycheck Protection Program 3 [Member] PPP Loans Over $2.0 Million [Member] Small Business Administration (SBA), CARES Act, Paycheck Protection Program loans under $350 thousand. Small Business Administration (SBA), CARES Act, Paycheck Protection Program 1 [Member] PPP Loans Under $350 Thousand [Member] Financing receivables related to serviced loans. Serviced Loans [Member] Serviced Loan [Member] Type of loan deferrals executed under the guidelines of the CARES Act. CARES Act, Loan Deferrals by Type [Member] Loan deferrals for one time. Loan Deferrals, One Time [Member] One Time [Member] Loan deferrals for two times. Loan Deferrals, Two Times [Member] Two Times [Member] Loan deferrals for three times. Loan Deferrals, Three Times [Member] Three Times [Member] Repayment status of loan deferrals executed under the guidelines of the CARES Act. CARES Act, Loan Deferrals by Repayment Status [Member] Loan deferrals with resumed payment status. Loan Deferrals, Resumed Payments [Member] Resumed Payments [Member] Tabular disclosure of additional details regarding the types of deferrals received and the repayment status of the loans executed consistent with the guidelines of the CARES Act. CARES Act Loan Deferral Status [Table Text Block] CARES Act Loan Deferral Status This element represent the carrying cost and fair value adjustments of foreclosed properties. Carrying cost and fair value adjustment for foreclosed properties 1 Carrying cost and fair value adjustments for foreclosed properties Amount of real estate investments acquired including foreclosure during the period. Real Estate New Assets Acquired New assets acquired This element represents the fair value adjustment to other real stated owned. Fair Value Adjustments To Other Real Estate Owned Fair value adjustments Loan modification for an extension of the term of a loan in which it must be paid and a reduction of contractual interest rate. Extended Maturity and Rate Reduction [Member] Combination [Member] Financing Receivable, Modifications, Troubled Debt Restructured Loans [Abstract] Troubled Debt Restructurings Segregated by Class [Abstract] Minimum threshold amount of loans requiring a performance bond to be posted by the general contractor to assure completion of the project. Minimum Threshold Amount of Loans Requiring Performance Bond Minimum threshold amount of loans requiring performance bond Weighted average price for potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Antidilutive Securities Excluded from Computation of Earnings Per Share, Weighted Average Price Options excluded from diluted calculations, weighted average price (in dollars per share) Disclosure about foreclosed properties classified by categories (for example, residential, nonresidential, 1-4 family, multifamily, construction loans, etc). Schedule of Foreclosed Properties [Table] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Schedule of Foreclosed Properties [Line Items] Refers to the agricultural or farmland real estate properties. Agricultural or Farmland [Member] Agricultural/Farmland [Member] Refers to the period of certain participant employee termination events following a change in control of the entity for the restriction on restricted stock granted to lapse, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Period of Certain Participant Employee Termination Events Following Change in Control for Restriction on Restricted Stock Granted to Lapse Period of certain participant employee termination events following change in control for restriction on restricted stock granted to lapse Refers to construction, land development and other real estate properties. Construction Land Development And Other [Member] Construction/Land Development/Other [Member] Refers to the 1-4 family real estate properties. One To Four Family [Member] 1-4 Family [Member] Refers to the Non-farm or non-residential real estate properties. Non-farm or non-residential [Member] Non-farm/Non-residential [Member] Closed-end loan or extension of credit for personal, family, or household use excluding real estate. Closed-End Consumer Loan [Member] Loan to finance the purchase of real estate, including but not limited to, commercials real estate. Commercial Loans [Member] Percentage of the impact of the difference in amortized cost basis versus consideration of loan balances on the allowance for credit losses. Loans and Leases Receivable, Allowance for Credit Losses, Difference in Amortized Cost Basis versus Consideration of Loan Balances, Percentage Impact of difference in amortized cost basis versus consideration of loan balances on allowance for credit losses Refers to the past due period after which loans must be well secured and in the process of collection to continue accruing interest, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Past due period after which loans must be well secured and in process of collection to continue accruing interest Past due period after which loans must be well secured and in the process of collection to continue accruing interest Allowance for loan and lease losses transitioned to allowance for credit losses [Abstract] Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on components of equity, net of deferred tax in the statement of financial position as of the beginning of the earliest period presented. New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Equity, Net of Deferred Tax Decrease in shareholders' equity, net of deferred tax Period for which principal and interest payments must remain current for reclassifying nonaccrual loans as accruing loans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Period of Current Principal and Interest Payments for Reclassifying Nonaccrual Loans as Accruing Loans Period of current principal and interest payments for reclassifying nonaccrual loans as accruing loans The amount of reserve for unfunded lending commitments. Reserve For Unfunded Lending Commitments Reserve for unfunded lending commitments Allowance for Loan and Lease Loss [Abstract] Allowance for Loan and Lease Losses [Abstract] The required percentage exposure of capital included as factors in the allowance for credit losses (ACL) model. Percentage Exposure of Capital Included As Factors in Allowance for Credit Losses Model Percentage exposure of capital Threshold period past due for the initiation of foreclosure proceedings, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Threshold Period Past Due for Initiation of Foreclosure Proceedings Threshold period past due for initiation of foreclosure proceedings Threshold amount of outstanding loan balance for a specific reserve equal to the difference between book value of the loan and the fair value assigned to the collateral to be created until such time as the loan is foreclosed. Financing Receivables, Threshold Outstanding Loan Balance for Specific Reserve to be Created Threshold amount of outstanding loan balance for specific reserve to be created Threshold period past due for individual evaluation, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Threshold Period Past Due For Individual Evaluations Threshold period past due for individual evaluations Refer to current value assessment period for past due loans secured against real estate, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Current value assessment period for past due loans secured against real estate Current value assessment period for past due loans secured against real estate The maximum number of delinquent payments that a closed-end loan (excluding conventional 1-4 family residential loans and installment and revolving loans secured by real estate) may be delinquent before being charged-off. If a loan is considered uncollectable, it is charged off earlier. Number of delinquent monthly payments before loan charge off Number of delinquent monthly payments before loan charge off The typical frequency of periodic reviews for appraisals on foreclosed properties and other real estate owned, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Other Real Estate Owned, Typical Frequency of Period Reviews Typical frequency of periodic reviews Threshold amount outstanding loan balance for individual evaluations of a loan under internal risk grading system. Threshold Outstanding Loan Balance for Individual Evaluations Threshold outstanding loan balance for individual evaluations The forecast period used in calculating the allowance for credit losses, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Financing Receivable, Allowance for Credit Losses, Forecast Period Forecast period used in calculating the allowance for credit losses An unsecured loan to a company for purposes such as seasonal working capital needs, inventory financing, equipment purchases and acquisitions. Unsecured Commercial Loan [Member] Percentage of allowance for loan and lease losses or allowance for credit losses of total loan portfolio. Loans and Leases Receivable, Allowance for Credit Losses, Percentage of Portfolio % of portfolio The frequency of periodic reviews for appraisals on foreclosed properties and other real estate owned generally, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Other Real Estate Owned, Frequency of Periodic Reviews Frequency of periodic reviews in general Non-performing loan on which interest is overdue and full collection of principal is uncertain. Nonaccrual Status [Member] Nonaccrual Status [Member] A debt restructuring in which a creditor, for economic or legal reasons related to a debtor's financial difficulties, grants a concession to the debtor that it would not otherwise consider Troubled Debt Restructuring [Member] TDR [Member] Other assets especially mentioned. OAEM [Member] Portfolio segment of the company's total financing receivables related to residential financing receivables and total financing receivables related to consumer receivables. Residential and Consumer Portfolio Segments [Member] Financing Receivable, Credit Quality By Loan Class [Abstract] Credit Risk Profile, Segregated by Class [Abstract] Refers to the review period considered for loans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Review Period for Loans Review period for loans A category of financing receivables considered to have potential weaknesses that deserve management's watch. Watch [Member] Watch [Member] The percentage of total investment with unrealized losses. Percentage of total investment with unrealized losses Percentage of total investment with unrealized losses Debt Securities, Available for Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] Available-for-sale, amortized cost [Abstract] This item represents the aggregate amortized cost of investments in debt securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. Debt Securities, Available-for-sale, Continuous Unrealized Loss Position Twelve Months or Longer Amortized Cost 12 months or more This item represents the aggregate amortized cost of investments in debt securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. Debt Securities, Available-for-sale, Continuous Unrealized Loss Position Amortized Cost Total This item represents the aggregate amortized cost of investments in debt securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. Debt Securities, Available-for-sale, Continuous Unrealized Loss Position Less Than Twelve Months Amortized Cost Less than 12 months Fair value information by fair value measurement of mortgage servicing rights. Mortgage Servicing Rights [Member] This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents mortgage servicing right at fair value. Mortgage servicing rights, fair value disclosure Mortgage servicing rights Impaired loan (collateral dependent) [Abstract] The amount at which an asset could be bought or sold in a current transaction between willing parties, that is, other than in a forced or liquidation sale. Fair value adjustment on collateral dependent loans Fair value adjustments on collateral dependent loans The amount at which an asset could be bought or sold in a current transaction between willing parties, that is, other than in a forced or liquidation sale. Fair value adjustment on other real estate owned Other real estate owned, fair value adjustment Assets measured on a -non-recurring basis [Abstract] Assets measured-nonrecurring basis [Abstract] This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents other real estate owned at fair value. Other real estate owned, fair value disclosure Other real estate owned This element represents the fair value disclosure of impaired loan receivable as presented on the statement of financial position which may include mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts, or any other loans which are due the Company as of the balance sheet date. Impaired Loans, Fair Value Disclosure Impaired loans This element represents the fair value disclosure of collateral dependent loan receivable as presented on the statement of financial position. Collateral Dependent Loans, Fair Value Disclosure Collateral dependent loans Loans Without Specific Valuation Allowance [Abstract] Loans without a specific valuation allowance [Abstract] Total loans [Abstract] Total loans [Abstract] Loans with a specific valuation allowance [Abstract] Number of impaired financial receivables. Impaired Financing Receivable, Number of Loans Number of Loans Pledge of underground coal mining equipment and junior real estate liens to serve as protection against default. Collateral Pledged by Underground Coal Mining Equipment and Junior Real Estate Liens [Member] Collateral Pledged by Underground Coal Mining Equipment and Junior Real Estate Liens [Member] Pledge of leasehold mortgage to serve as protection against default. Collateral Pledged by Leasehold Mortgage [Member] Collateral Pledged by Leasehold Mortgage [Member] Pledge of mix of commercial real estate and liens on furniture, fixtures, and equipment to serve as protection against default. Collateralized by Commercial Real Estate and Liens on Furniture, Fixtures, and Equipment [Member]