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Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net Cash Provided by (Used in) Operating Activities, Continuing Operations Other Fees Other Fees Other Fees Total Shareholder Return Amount Total Shareholder Return Amount Due after 10 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Cash and due from banks Cash and Due from Banks Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Financial Asset, Period Past Due [Domain] Financial Asset, Aging [Domain] Tier I capital (to average assets), capital requirements, ratio Tier I capital (to average assets), capital requirements ratio The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations. Uninsured scheduled maturities, year one Time Deposit Liability Uninsured, Maturity, Within Year One Time Deposit Liability Uninsured, Maturity, Within Year One Available-for-sale securities, gross realized gains Debt Securities, Available-for-Sale, Realized Gain Premises and equipment, gross Property, Plant and Equipment, Gross Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Other assets Other Assets Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Deposits Deposits, by Type [Abstract] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Weighted average common shares outstanding assuming dilution (in shares) Weighted Average Number of Shares Outstanding, Diluted Finance receivable, related parties Loans and Leases Receivable, Related Parties Deferred Tax Liabilities, Supplemental Retirement Plan Deferred Tax Liabilities, Supplemental Retirement Plan Deferred Tax Liabilities, Supplemental Retirement Plan Accrued interest payable Accrued Liabilities, Fair Value Disclosure MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Total shareholders’ equity Beginning balance Ending balance Total shareholders’ equity Equity, Attributable to Parent Common shares in treasury, at cost (2,588,135 shares at December 31, 2025 and 2,001,668 shares at December 31, 2024, respectively) Treasury Stock, Value Due in 1 year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Indefinite-lived intangible assets: Unamortized intangible assets: Unamortized Intangible Asset Disposal Group, Including Discontinued Operation, Revenue Disposal Group, Including Discontinued Operation, Revenue Software and Software Development Costs Software and Software Development Costs [Member] Percent of Total Weighted Average Rate of Time Deposits [Abstract] Product Product [Member] Number of shares authorized (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Document Fiscal Period Focus Document Fiscal Period Focus All Executive Categories All Executive Categories [Member] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Assets Assets [Abstract] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Document Type Document Type Savings deposits Deposits, Savings Deposits Actuarial (gain) loss Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Software Software Computer Software, Intangible Asset [Member] Summary of ACL by Category Summary of Allowance For Credit Loss by Category [Table Text Block] Summary of ACL by Category. Number of loans individually evaluated for impairment Number Of Loans Individually Evaluated for Impairment Number Of Loans Individually Evaluated for Impairment Other Income and Expenses [Abstract] Other Income and Expenses [Abstract] Defined Benefit Plan [Table] Defined Benefit Plan [Table] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] 60-89 Days Financial Asset, 60 to 89 Days Past Due [Member] Parent Company Parent Company [Member] Maximum Maximum [Member] Condensed Cash Flow Statement Condensed Cash Flow Statement [Table Text Block] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Furniture, fixtures and equipment Furniture and Fixtures [Member] $100 to less than $250 Time Deposits, More than $100,000 Less than $250,000 The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more and total to less than $250,000. 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Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Interest Expense: Interest Expense, Operating and Nonoperating [Abstract] Occupancy, Discontinued Operations Occupancy, Discontinued Operations Occupancy, Discontinued Operations Net cash (used in) provided by investing activities Net Cash Provided by (Used in) Investing Activities Net Cash Provided by (Used in) Investing Activities Deposits Deposits, Fair Value Disclosure Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Axis] Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent Non-marketable Equity Investments Equity Method Investments [Policy Text Block] Other operating activities, net Other, net Other Operating Activities, Cash Flow Statement All Adjustments to Compensation All Adjustments to Compensation [Member] Other intangible assets, net Other Intangible Assets, Net Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Available-for-sale securities, percentage of total securities Available-For-Sale, Securities In Unrealized Loss Positions, Percentage Of Total Securities The percentage of the number of investment positions in the available-for-sale investments determined to be temporarily impaired. Legal Entity [Axis] Legal Entity [Axis] Scenario [Domain] Scenario [Domain] Tier I capital (to risk-weighted assets), actual, ratio Tier I capital (to risk-weighted assets), actual ratio Ratio of Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework. Common stock, par value $0.50 per share; 40,000,000 shares authorized; 15,505,772 shares issued at December 31, 2025 and 2024; 12,917,637 and 13,504,104 shares outstanding at December 31, 2025 and 2024, respectively. 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Restatement Determination Date Restatement Determination Date Fair Value Estimate of Fair Value Measurement [Member] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Condensed Financial Information of Parent Company Condensed Financial Information of Parent Company Only Disclosure [Text Block] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Promotional expense Marketing and Advertising Expense Operating lease, right-of-use asset Operating Lease, Right-of-Use Asset Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Condensed Financial Information Disclosure [Abstract] Condensed Financial Information Disclosure [Abstract] Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] CALIFORNIA CALIFORNIA Common Stock and Earnings per Share Earnings Per Share [Text Block] Exercise of SARs Stock Issued During Period, Value, Stock Options Exercised Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent Granted in period, weighted average fair value (in dollars per share) Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Income Taxes Income Tax, Policy [Policy Text Block] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Segments [Domain] Segments [Domain] Summary of Loan Categories Summary of Loan Categories [Table Text Block] Tabular disclosure for loan categories. Interest Income: Interest and Dividend Income, Operating [Abstract] Unrecognized Tax Benefits [Roll Forward] Unrecognized Tax Benefits [Roll Forward] Tier I capital (to risk-weighted assets), actual, amount Common Equity Tier I Capital (to risk-weighted assets), actual amount Common Equity Tier 1 Risk Based Capital as defined in the regulations. Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share PEO PEO [Member] Name Trading Arrangement, Individual Name Accrued pension asset (liability) Defined Benefit Plan, Funded (Unfunded) Status of Plan Interest on deposits Total Interest Expense, Deposits Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Other operating expense Total other operating expense Other Noninterest Expense Entity Public Float Entity Public Float Total capital (to risk weighted assets), requirement to be well-capitalized, amount Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum Equity in undistributed income of subsidiaries Equity in undistributed income of subsidiaries Income (Loss) from Equity Method Investments Income from continuing operations, before income tax expense Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Expenses: Expenses: Expenses: Beginning balance Ending balance Defined Benefit Plan, Benefit Obligation Interest and fees on loans Interest and Fee Income, Loans and Leases Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Restricted Stock Award, Forfeitures Restricted Stock Award, Forfeitures Income from subsidiaries – management fees Investment Income, Nonoperating Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Shares outstanding at January 1 Shares outstanding at December 31 Shares, Outstanding Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Reduction of tax benefits over the next twelve months Decrease in Unrecognized Tax Benefits is Reasonably Possible Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Local Phone Number Local Phone Number Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Adjusted Balance Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Operating Expenses Operating Expenses Accounts and drafts payable, discontinued operations Accounts and drafts payable, discontinued operations Accounts and drafts payable, discontinued operations Provision for (release of) credit losses Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) PEO Total Compensation Amount PEO Total Compensation Amount Occupancy Occupancy, Net Investment securities available-for-sale, at fair value Fair Value Total Debt Securities, Available-for-Sale, Excluding Accrued Interest Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Schedule of Interest Bearing Deposits Schedule of Interest Bearing Deposits [Table Text Block] Tabular disclosure of interest bearing deposits. Debt Disclosure [Abstract] Debt Disclosure [Abstract] Asset acquisition Payments for Asset Acquisitions Payments for Asset Acquisitions Common Stock Common Stock [Member] Total capital (to risk-weighted assets), actual, amount Banking Regulation, Total Capital, Actual Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Employee SARs exercised Employee SARs exercised Number of share options and stock appreciation rights exercised during the current period. Total capital (to risk-weighted assets), capital requirements, ratio Total capital (to risk-weighted assets), capital requirements ratio The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. Segment Reporting [Abstract] Segment Reporting [Abstract] Interest-bearing demand deposits Demand Deposit Accounts Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Entity Central Index Key Entity Central Index Key Scenario [Axis] Scenario [Axis] Net (decrease) increase in accounts and drafts payable Increase (Decrease) in Accounts Payable and Other Operating Liabilities Allowance for credit losses on loans: Financing Receivable, Allowance for Credit Loss [Roll Forward] Discontinued Operations and Disposal Groups [Abstract] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Schedule of Stock Appreciation Right Activity Share-Based Payment Arrangement, Stock Appreciation Right, Activity [Table Text Block] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Financial Instrument [Axis] Financial Instrument [Axis] Industry Segment Information Segment Reporting Disclosure [Text Block] Available-for-sale, securities in unrealized loss positions, greater than one year, percentage Available-For-Sale, Securities In Unrealized Loss Positions, Greater Than 12 Months, Percentage Of Total Securities Available-For-Sale, Securities In Unrealized Loss Positions, Greater Than 12 Months, Percentage Of Total Securities Net increase in time deposits Increase (Decrease) in Time Deposits Share-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Restricted Stock Restricted Stock [Member] Measurement Basis [Axis] Measurement Basis [Axis] Loans, net Loans Receivable, Fair Value Disclosure Processing Fees Processing Fees [Policy Text Block] The accounting policy for processing fees. 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Equity Awards Adjustments Equity Awards Adjustments [Member] Operating lease, liability Total lease liability Operating Lease, Liability Underlying Securities Award Underlying Securities Amount Performance-based Restricted Stock Performance Shares [Member] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Investment Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Commercial letters of credit Commercial letters of credit [Member] Commercial letters of credit member. Cash dividends Dividends, Common Stock, Cash Amendment Flag Amendment Flag Carrying Amount Reported Value Measurement [Member] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Subsequent Events [Abstract] Subsequent Events [Abstract] Recoveries Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery Actual investment return Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Due in 1 year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Unused Available Lines of Credit Debt Disclosure [Text Block] Condensed Income Statement [Table] Condensed Income Statement [Table] Collateral Held [Axis] Collateral Held [Axis] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Loans Financing Receivable [Policy Text Block] Issuance of common stock: Shares Granted or Issued, Share-Based Payment Arrangement [Abstract] Condensed Cash Flow Statements, Captions [Line Items] Condensed Cash Flow Statements, Captions [Line Items] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Construction Construction [Member] Income Tax Paid, Foreign, after Refund Received Income Tax Paid, Foreign, after Refund Received Tier I capital (to risk-weighted assets), requirement to be well-capitalized, amount Banking Regulation, Tier 1 Risk-Based Capital, Well Capitalized, Minimum Financial Fees Financial Fees [Policy Text Block] Financial Fees Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Cash and cash equivalents at beginning of year Cash and cash equivalents at end of year Cash and Cash Equivalents, at Carrying Value One year Time Deposits, Weighted Average Interest Rate, Maturities Year One Financing Receivable, Modifications, Number of Contracts Financing Receivable, Modifications, Number of Contracts Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Provision for (release of) credit losses Provision for (release of) credit losses Financing Receivable, Credit Loss, Expense (Reversal) Auditor Name Auditor Name Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Premises, useful life Property, Plant and Equipment, Useful Life Fair Value Measurement [Domain] Fair Value Measurement [Domain] Net (decrease) increase in accounts and drafts payable Increase (Decrease) In Accounts and Drafts Payable Net change during the reporting period in the carrying amount of accounts and drafts payable. Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Schedule of Credit Exposure of the Loan Portfolio Schedule of Credit Exposure of the Loan Portfolio [Table Text Block] Tabular disclosure for credit exposure of loan portfolio by internally assigned credit grade. Audit Information [Abstract] Audit Information [Abstract] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Total assets Total assets Assets Purchases of premises and equipment, net Payments to Acquire Property, Plant, and Equipment Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Time deposits: Time Deposits [Abstract] Commitments and Contingencies Commitments and Contingencies Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Stock-Based Compensation Share-Based Payment Arrangement [Policy Text Block] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Shares exercised, intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Exercised Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Exercised Termination Date Trading Arrangement Termination Date 1-2 years Lessee, Operating Lease, Liability, to be Paid, Year Two Other liabilities Other Liabilities $100 to less than $250 Interest Expense Time Deposits 100000 or More and Less Than 250000 Interest expense incurred on time deposits, including certificates of deposits, $100,000 or more and less than $250,000 in domestic offices. Credit Exposure Of Loan Portfolio [Domain] Credit Exposure Of Loan Portfolio Domain [Domain] Credit Exposure Of Loan Portfolio Domain Due after 1 year through 5 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Funded status: Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] Leasehold improvements Leaseholds and Leasehold Improvements [Member] Net income Net income Net Income (Loss) Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Fair Value, by Balance Sheet Grouping Fair Value, by Balance Sheet Grouping [Table Text Block] Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Total loans Total Loans Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss, Current Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Due after 10 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Net (increase) decrease in accounts and drafts receivable from customers Net (Increase) Decrease In Accounts And Drafts Receivable From Customers Net (Increase) Decrease In Accounts And Drafts Receivable From Customers Entity File Number Entity File Number Lease payments due Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Exempt from federal income taxes Interest Income, Securities, Operating, Tax Exempt Consolidated Entities [Domain] Consolidated Entities [Domain] Income Statement [Abstract] Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Transfer to defined contributions plan Transfer to defined contributions plan Transfer to defined contributions plan Federal Current Federal Tax Expense (Benefit) Entity Address, Address Line Two Entity Address, Address Line Two Name Forgone Recovery, Individual Name Operating lease, weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Financial fees Financial Fees [Member] Financial Fees Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Schedule of Expected Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Changes in unrecognized tax benefits as a result of tax positions taken during a prior year Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Tier I capital (to average assets), actual, amount Banking Regulation, Tier 1 Leverage Capital, Actual PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Income (Loss) from Continuing Operations, Per Diluted Share Income (Loss) from Continuing Operations, Per Diluted Share Adjustment to Compensation: Adjustment to Compensation [Axis] Type of Borrower [Axis] Type of Borrower [Axis] Deferred Tax Asset, Tax Deferred Expense, Reserve and Accrual, Financing Receivable, Allowance for Credit Loss Deferred Tax Asset, Tax Deferred Expense, Reserve and Accrual, Financing Receivable, Allowance for Credit Loss Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Balance sheet liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Due after 1 year through 5 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Interest Expense, Operating Interest Expense, Operating Participating Mortgage Loans [Line Items] Participating Mortgage Loans [Line Items] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Amortization [Abstract] Amortization [Abstract] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Property, Plant and Equipment, Other Types Property, Plant and Equipment, Other Types [Member] $250 or more(1) Time Deposits, More than $250,000 The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $250,000 or more. Weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Tier I capital (to average assets), actual, ratio Tier I capital (to average assets), actual ratio Tier 1 Leverage Capital divided by average assets as defined in the regulations. Tax effect OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Marketable Securities [Line Items] Marketable Securities [Line Items] AFS, 12 months or more, Unrealized Losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Plan assets, target allocation percentage Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Decrease (increase) in payments in advance of funding Net decrease (increase) in payments in advance of funding (Increase) Decrease In Payments In Excess Of Funding Net change during the reporting period in the carrying amount of payments in excess of funding. Name Awards Close in Time to MNPI Disclosures, Individual Name Disposal Group, Including Discontinued Operation, Depreciation and Amortization Disposal Group, Including Discontinued Operation, Depreciation and Amortization AFS, Less than 12 Months, Unrealized Losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Total capital (to risk-weighted assets), actual, ratio Total capital (to risk-weighted assets), actual ratio Total Capital divided by risk weighted assets as defined in the regulations. Entity Filer Category Entity Filer Category Individually Evaluated Loans Impairment of Loans [Policy Text Block] Disclosure of accounting policy for impairment of loans. Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statements, Captions [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] Statistical Measurement [Domain] Statistical Measurement [Domain] Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Loan Restructuring Modification [Axis] Loan Restructuring Modification [Axis] Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Percent Effective Income Tax Rate Reconciliation, Tax Contingency, Foreign, Percent Unrecognized tax benefits that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] All Trading Arrangements All Trading Arrangements [Member] Accounts and drafts payable Accounts and drafts payable Accounts And Drafts Payable, Carrying Amount Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business and includes carrying value of amounts due on drafts payable on the balance sheet date. Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] $250 or more Interest Expense Time Deposits 250000 or More Interest expense incurred on time deposits, including certificates of deposits, of $250,000 or more in domestic offices. Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Real Estate, Faith-Based, Mortgage Real Estate Faith-based Mortgage [Member] Real Estate Faith-based Mortgage [Member] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Cash paid for income taxes Cash paid for income taxes Income Taxes Paid, Net Other Commitments [Line Items] Other Commitments [Line Items] Deferred Tax Asset, Lease Liability Deferred Tax Asset, Lease Liability Deferred Tax Asset, Lease Liability Pay vs Performance Disclosure [Line Items] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Tier I capital (to risk-weighted assets), capital requirements, ratio Tier I capital (to risk-weighted assets), capital requirements ratio The minimum 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. Common equity tier I capital (to risk-weighted assets), requirement to be well-capitalized, ratio Common Equity Tier I Capital (to risk-weighted assets), requirement to be well capitalized ratio 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. Total intangible assets, net Intangible Assets, Net (Including Goodwill) Revenue, Performance Obligation [Abstract] Revenue, Performance Obligation [Abstract] Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Interest-Bearing Deposits Deposit Liabilities Disclosures [Text Block] Other Performance Measure, Amount Other Performance Measure, Amount Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax Leases Lessee, Operating Leases [Text Block] Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] Common stock, shares, outstanding (in shares) Common Stock, Shares, Outstanding Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Operating lease, cost Operating Lease, Cost Amortization expense, next rolling twelve months Finite-Lived Intangible Assets, Amortization Expense, Next Rolling 12 Months Four years Time Deposits, Weighted Average Interest Rate, Maturities Year Four Nonperforming Loans Subject To Special Monitoring Nonperforming Loans Subject To Special Monitoring [Member] Nonperforming Loans Subject To Special Monitoring [Member] Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Disposal Group, Including Discontinued Operation, Property, Plant and Equipment Disposal Group, Including Discontinued Operation, Property, Plant and Equipment Industry Sector [Domain] Industry Sector [Domain] Available-for-sale securities, gross realized losses Debt Securities, Available-for-Sale, Realized Loss Service cost Service cost – benefits earned during the year Defined Benefit Plan, Service Cost AcuAudit AcuAudit [Member] AcuAudit Entity Tax Identification Number Entity Tax Identification Number Banking Regulation, Regulatory Capital Requirement, Compliance [Table] Banking Regulation, Regulatory Capital Requirement, Compliance [Table] Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] Changes in unrecognized tax benefits as a result of tax positions taken during a prior year Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Retirement Plan Type [Axis] Retirement Plan Type [Axis] Loans Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Total Time Deposits, Weighted Average Interest Rate, Aggregate Aggregate percentage of weighted average interest rate for time deposits held by the entity with maturities from one to five years. Patent Patents [Member] Treasury Stock Treasury Stock, Common [Member] Cass Commercial Bank Cass Commercial Bank [Member] Cass Commercial Bank [Member] Treasury securities US Treasury Securities [Member] Other Cost and Expense, Operating Other Cost and Expense, Operating Purchase of common shares (in shares) Stock Issued During Period, Shares, Purchase of Assets Equity Components [Axis] Equity Components [Axis] Income (Loss) from Discontinued Operations Including Tax Equivalent Adjustment, Before Income Taxes, Noncontrolling Interest Income (Loss) from Discontinued Operations Including Tax Equivalent Adjustment, Before Income Taxes, Noncontrolling Interest Income (Loss) from Discontinued Operations Including Tax Equivalent Adjustment, Before Income Taxes, Noncontrolling Interest Participating Mortgage Loans [Table] Participating Mortgage Loans [Table] Trade Name Trade Names [Member] Cash Provided by (Used in) Investing Activities, Discontinued Operations Cash Provided by (Used in) Investing Activities, Discontinued Operations Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Time deposits: Interest Expense, Time Deposits [Abstract] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Cash Provided by (Used in) Financing Activities, Discontinued Operations Cash Provided by (Used in) Financing Activities, Discontinued Operations Effective Income Tax Rate Reconciliation [Line Items] Effective Income Tax Rate Reconciliation [Line Items] Diluted: Earnings Per Share, Diluted [Abstract] Savings deposits Interest Expense, Savings Deposits Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Proceeds from maturities of securities available-for-sale Proceeds from maturities of securities available-for-sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Deferred Tax Assets, Net Deferred Tax Assets, Net 4-5 years Lessee, Operating Lease, Liability, to be Paid, Year Five Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Amortization of restricted stock bonus Amortization of restricted stock bonus Amount of amortization of the restricted stock bonus. Other Operating Expense Other Operating Income and Expense [Text Block] AFS, Total Estimated Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position Cash and cash equivalents at beginning of year Cash and cash equivalents at end of year Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Net amortization of premium/discount on investment securities Accretion (Amortization) of Discounts and Premiums, Investments State and Local Tax Jurisdiction, Other State and Local Tax Jurisdiction, Other [Member] Unrecognized compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Current Foreign Tax Expense (Benefit) Current Foreign Tax Expense (Benefit) Consolidation Items [Axis] Consolidation Items [Axis] Net income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Treasury stock (in shares) Treasury Stock, Common, Shares Unrecognized tax benefit, interest on income taxes accrued Unrecognized Tax Benefits, Interest on Income Taxes Accrued Processing fees Processing Fees [Member] Processing Fees Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Product and Service [Domain] Product and Service [Domain] Short-term lease, cost Short-Term Lease, Cost Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Schedule of Plan's Pension Costs Schedule of Plan's Pension Costs [Table Text Block] Tabular disclosure of net periodic pension costs. Security Exchange Name Security Exchange Name Information Services Information Services [Member] Information Services [Member] Net unrealized gain (loss) on securities available-for-sale OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Other benefits Other benefits Other benefits Capital Requirements and Regulatory Restrictions Regulatory Capital Requirements under Banking Regulations [Text Block] Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount State Current State and Local Tax Expense (Benefit) Total personnel expenses Total personnel expenses Salaries and employee benefits Labor and Related Expense Loans Excluding Unfunded Commitments Loans Excluding Unfunded Commitments [Member] Loans Excluding Unfunded Commitments Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Schedule of Investment Securities Debt Securities, Available-for-Sale [Table Text Block] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments [Table Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Common stock, shares issued (in shares) Common Stock, Shares, Issued Total capital (to risk-weighted assets), capital requirements, amount Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum Increase (decrease) in current income tax liability Increase (Decrease) in Income Taxes Payable Entity [Domain] Entity [Domain] Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Revenue Not from Contract with Customer, Other Revenue Not from Contract with Customer, Other Disposal Group, Including Discontinued Operation, Assets Disposal Group, Including Discontinued Operation, Assets Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent AFS, Total Unrealized Losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Net (decrease) increase in interest-bearing demand and savings deposits Net Increase (Decrease) In Interest-Bearing Demand And Savings Deposits Net change during the reporting period in interest-bearing demand and savings deposits. Amortization expense, rolling year five Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Five Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Commitments to extend credit Commitments to Extend Credit [Member] Commercial and standby letters of credit, remaining duration, term Commercial And Standby Letters Of Credit, Remaining Duration, Term Commercial And Standby Letters Of Credit, Remaining Duration, Term Other Fees, discontinued operations Other Fees, discontinued operations Other Fees, discontinued operations Financial fees Bank Service Fees [Member] Bank Service Fees Common stock, shares authorized (in shares) Common Stock, Shares Authorized Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Profit Sharing Expense Profit Sharing Expense Profit Sharing Expense Plan assets, measurement input Defined Benefit Plan, Plan Assets, Measurement Input Defined Benefit Plan, Plan Assets, Measurement Input Bad debt expense Bad debt expense Bad debt expense Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Entity Voluntary Filers Entity Voluntary Filers Net actuarial loss in accumulated other comprehensive loss Defined Benefit Plan, Amortization of Gain (Loss) Premises and Equipment Property, Plant and Equipment Disclosure [Text Block] Weighted average discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Discontinued Operations, Policy Discontinued Operations, Policy [Policy Text Block] Other comprehensive income Other comprehensive income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent AFS, 12 months or more, Estimated Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Increase (Decrease) in Other Operating Liabilities Increase (Decrease) in Other Operating Liabilities Total Foreign Income Tax Total Foreign Income Tax Total Foreign Income Tax Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Fair value, January 1 Fair value, December 31 Defined Benefit Plan, Plan Assets, Amount Loans Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Common equity tier I capital (to risk-weighted assets), requirement to be well-capitalized, amount Common Equity Tier I Capital (to risk-weighted assets), requirement to be well capitalized amount The amount of Common Equity Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. Employee restricted stock surrendered for tax obligations Stock Issued During Period, Shares, Restricted Stock Award, Gross Investments in subsidiaries Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Tax effect Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Document Annual Report Document Annual Report Schedule of Assumed Long-term Rate of Return on Assets Schedule of Assumed Long-term Rate of Return on Assets [Table Text Block] Tabular disclosure for assumed long term rate of return on assets. Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Condensed Balance Sheet Condensed Balance Sheet [Table Text Block] Amortization of intangible assets Amortization of Intangible Assets Accounting Policies [Abstract] Accounting Policies [Abstract] Liabilities: Liabilities [Abstract] Fee Revenue and Other Income: Revenues [Abstract] Leasehold Improvements Leasehold Improvements [Member] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Current Fiscal Year End Date Current Fiscal Year End Date Discount on cash flows Lessee, Operating Lease, Liability, Undiscounted Excess Amount Six Corresponding Banks Six Corresponding Banks [Member] Six Corresponding Banks Short-term investments Short-Term Investments PEO Name PEO Name Total Time Deposits Award Type [Domain] Award Type [Domain] Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Directors’ stock grants Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Profit sharing expense Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year Schedule of Intangible Assets and Goodwill Schedule of Intangible Assets and Goodwill [Table Text Block] Non-PEO NEO Non-PEO NEO [Member] Finite-lived, intangible assets, useful life Finite-Lived Intangible Asset, Useful Life Disposal Group, Including Discontinued Operation, Other Expense Disposal Group, Including Discontinued Operation, Other Expense Additional Paid-in Capital Additional Paid-in Capital [Member] Equipment Equipment Expense Disposal Group, Including Discontinued Operation, Other Assets Disposal Group, Including Discontinued Operation, Other Assets Tier I capital (to average assets), capital requirements, amount Banking Regulation, Tier 1 Leverage Capital, Capital Adequacy, Minimum Other benefits, Discontinued Operations Other benefits, Discontinued Operations Other benefits, Discontinued Operations Employee Benefit Plans Retirement Benefits [Text Block] Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Impact of New and Not Yet Adopted Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Accumulated Amortization Total intangible assets, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Name Measure Name Entity Interactive Data Current Entity Interactive Data Current Total personnel expenses, Discontinued Operations Total personnel expenses, Discontinued Operations Total personnel expenses, Discontinued Operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Income Tax Paid, Federal, after Refund Received Income Tax Paid, Federal, after Refund Received Outside service fees Outside service fees Outside service fees. Proceeds from sales of securities available-for-sale Proceeds from sales of securities available-for-sale Proceeds from Sale of Debt Securities, Available-for-Sale Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Cass Information Systems, Inc. Cass Information Systems Inc. [Member] Cass Information Systems Inc. [Member] Share-based compensation expense Share-Based Payment Arrangement, Noncash Expense Deferred Tax Assets, Net of Valuation Allowance Deferred Tax Assets, Net of Valuation Allowance Over 5 years Lessee, Operating Lease, Liability, to be Paid, Due after Year Four Lessee, Operating Lease, Liability, to be Paid, Due after Year Four Loss on Sale of Investments Loss on Sale of Investments Deferred Tax Liabilities, Deferred Expense, Capitalized Research and Development Costs Deferred Tax Liabilities, Deferred Expense, Capitalized Research and Development Costs Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Faith-based CRE Faith-based CRE [Member] Faith-based CRE [Member] Total fee revenue and other income Total fee revenue and other income Fee revenue and other income Noninterest Income Interest-bearing demand deposits Interest Expense, Demand Deposit Accounts Service Service [Member] Deferred Tax Asset, In-Process Research and Development Deferred Tax Asset, In-Process Research and Development Non- accrual Financing Receivable, Excluding Accrued Interest, Nonaccrual Amortization expense, rolling year two Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Two Auditor Firm ID Auditor Firm ID Effective tax rate Effective tax rate Effective Income Tax Rate Reconciliation, Percent Total deposits Deposits Deposits Five years Time Deposits, Weighted Average Interest Rate, Maturities Year Five Number of reportable segments Number of Reportable Segments Total liabilities and shareholders’ equity Liabilities and Equity Foreclosed Assets Financing Receivable, Held-for-Investment, Foreclosed Asset [Policy Text Block] Subsequent Events Subsequent Events [Text Block] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Percentage of target opportunity for awards to vest Percentage of target opportunity for awards to vest Percentage of target opportunity for awards to vest. Finite Lived Intangible Assets Major Class Name Domain Finite-Lived Intangible Assets, Major Class Name [Domain] Schedule of Restricted Stock Activity Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Industry Sector [Axis] Industry Sector [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Defined Benefit Plan, Expected Return (Loss) on Plan Assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Amortization expense, rolling year three Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Three Measurement Input Type [Axis] Measurement Input Type [Axis] Individual: Individual [Axis] Class of Financing Receivable, Type of Borrower [Domain] Class of Financing Receivable, Type of Borrower [Domain] Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Disposal Group, Including Discontinued Operation, Liabilities Disposal Group, Including Discontinued Operation, Liabilities Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net Cash Provided by (Used in) Investing Activities, Continuing Operations Net Cash Provided by (Used in) Investing Activities, Continuing Operations Unappropriated retained earnings Retained Earnings, Unappropriated Product and Service [Axis] Product and Service [Axis] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Statement [Line Items] Statement [Line Items] Measurement Input Type [Domain] Measurement Input Type [Domain] Common equity tier I capital (to risk-weighted assets), actual, ratio Common Equity Tier I Capital (to risk-weighted assets), actual ratio Common Equity Tier 1 capital divided by risk weighted assets as defined by regulations. 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Payments in excess of funding are generated when, according to a service agreement with a few selected carriers, the company pays the carrier prior to receipt of the funds from the customer. The company receives a fee from the carrier for making this accelerated payment. Adoption Date Trading Arrangement Adoption Date Schedule of Maturities of Time Deposits Schedule of Maturities of Time Deposits [Table Text Block] Schedule of maturities of time deposits. 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Restatement Determination Date: Restatement Determination Date [Axis] Title of 12(b) Security Title of 12(b) Security Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Contractual Interest Rate Reduction Contractual Interest Rate Reduction [Member] Deferred Tax Assets, Other Deferred Tax Assets, Other Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Schedule of Common Stock Outstanding Roll Forward Schedule of Common Stock Outstanding Roll Forward [Table Text Block] Cash Flows From Financing Activities: Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] 2030 Defined Benefit Plan, Expected Future Benefit Payment, Year Five Schedule of Other Operating Cost and Expense, by Component Schedule of Other Operating Cost and Expense, by Component [Table Text Block] Preferred stock, par value $0.50 per share; 2,000,000 shares authorized and no shares issued Preferred Stock, Value, Issued Summary of the Fair Value Measurements by Type of Asset Summary of the Fair Value Measurements by Type of Asset [Table Text Block] Tabular disclosure for fair value of plan assets by type of asset. Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Line of Credit Facility, Fair Value of Amount Outstanding Line of Credit Facility, Fair Value of Amount Outstanding Two years Time Deposits, Weighted Average Interest Rate, Maturities Year Two Basic Earnings Per Share (in dollars per share) Earnings Per Share, Basic Real Estate, Commercial, Mortgage Real Estate Commercial Mortgage [Member] Real Estate Commercial Mortgage Operating lease, payments Operating Lease, Payments Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Number of troubled debt restructured loans subsequently defaulted Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts Four years Time Deposit Maturities, Year Four Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Amortization expense, rolling year four Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Four Schedule Of Net Periodic Pension Cost Related To SERP Schedule Of Net Periodic Pension Cost Related To SERP [Table Text Block] Schedule Of Net Periodic Pension Cost Related To SERP Premises and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Interest on short-term borrowings Interest Expense, Short-Term Borrowings Noncontributory Profit Sharing Program Noncontributory Profit Sharing Program [Member] Noncontributory Profit Sharing Program [Member] Loss on sales of securities Debt and Equity Securities, Gain (Loss) Long-term line of credit Long-Term Line of Credit Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Disposal Group, Including Discontinued Operation, Operating Expense Disposal Group, Including Discontinued Operation, Operating Expense Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Deferred Tax Asset, Debt Securities, Available-for-Sale, Unrealized Loss Deferred Tax Asset, Debt Securities, Available-for-Sale, Unrealized Loss Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Total net revenue Revenues Stock-based Compensation Share-Based Payment Arrangement [Text Block] Entity Address, City or Town Entity Address, City or Town Less allowance for credit losses Beginning balance Ending balance Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Other Commitments [Table] Other Commitments [Table] 401(k) employer contribution amount Defined Contribution Plan, Employer Discretionary Contribution Amount Forfeitures (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Business Acquisition [Axis] Business Acquisition [Axis] Net decrease (increase) in loans Payments for (Proceeds from) Loans and Leases Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Tier I capital (to risk-weighted assets), capital requirements, amount Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy, Minimum Current Financial Asset, Not Past Due [Member] Noninterest-bearing Noninterest-Bearing Deposit Liabilities Deferred Tax Liabilities, Leasing Arrangements Deferred Tax Liabilities, Leasing Arrangements Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Real Estate, Commercial, Construction Real Estate Commercial Construction [Member] Real Estate Commercial Construction Loan Summary of Projected Benefit Obligation Summary of Projected Benefit Obligation [Table Text Block] Tabular disclosure for projected benefit obligation, assets, funded status and amounts recognized. Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Purchase of common shares Treasury Stock, Value, Acquired, Cost Method Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance, Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance, Amount Total Assets, Fair Value Disclosure Document Period End Date Document Period End Date Total undiscounted cash flows Lessee, Operating Lease, Liability, to be Paid Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Insider Trading Arrangements [Line Items] Effective Income Tax Rate Reconciliation, Tax Contingency, Foreign, Amount Effective Income Tax Rate Reconciliation, Tax Contingency, Foreign, Amount Schedule of Pretax Amounts in Accumulated Other Comprehensive Loss Schedule of Pretax Amounts in Accumulated Other Comprehensive Loss [Table Text Block] Tabular disclosure for pre-tax amounts in accumulated other comprehensive loss. Three years Time Deposit Maturities, Year Three Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] 2-3 years Lessee, Operating Lease, Liability, to be Paid, Year Three Accumulated benefit obligation Defined Benefit Plan, Accumulated Benefit Obligation Income Tax Paid, State and Local, after Refund Received Income Tax Paid, State and Local, after Refund Received Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Schedule of Assumptions used to Determine Net Pension Cost Schedule of Assumptions used to Determine Net Pension Cost [Table Text Block] Tabular disclosure for Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost. 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Uninsured scheduled maturities, year one through three Time Deposit Liability Uninsured, Maturity, Year One Through Three Time Deposit Liability Uninsured, Maturity, Year One Through Three Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Total operating expense Noninterest Expense Executive Category: Executive Category [Axis] Investment in Debt Securities Investment in Debt Securities [Policy Text Block] Disclosure of accounting policy for investments in debt securities. Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Purchases of securities available-for-sale Proceeds from sales of investment securities available-for-sale Payments to Acquire Debt Securities, Available-for-Sale Company Selected Measure Name Company Selected Measure Name