Business Acquisition [Axis] Business Acquisition [Axis] Due in 1 year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Real estate investment trusts Real Estate Defined Benefit Plan, Real Estate [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Total undiscounted cash flows Lessee, Operating Lease, Liability, to be Paid Leasehold improvements Leaseholds and Leasehold Improvements [Member] C&I C&I [Member] C&I [Member] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Amortization expense, next rolling twelve months Finite-Lived Intangible Assets, Amortization Expense, Next Rolling 12 Months One year Time Deposit Maturities, Year One Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Participating Mortgage Loans [Table] Participating Mortgage Loans [Table] Total capital (to risk-weighted assets), actual, amount Banking Regulation, Total Capital, Actual 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. $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. Premises and equipment, gross Property, Plant and Equipment, Gross Cash dividends paid Payments of Ordinary Dividends, Common Stock Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Real Estate, Faith-Based, Mortgage Real Estate Faith-based Mortgage [Member] Real Estate Faith-based Mortgage [Member] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Net increase in loans Payments for (Proceeds from) Loans and Leases Percent of Total Weighted Average Rate of Time Deposits [Abstract] Premises and equipment Deferred Tax Liabilities, Property, Plant and Equipment Net increase in noninterest-bearing demand deposits Net Increase (Decrease) In Noninterest-Bearing Demand Deposits Net change during the reporting period in noninterest-bearing demand deposits. Lease liability Deferred Tax Asset, Lease Liability Deferred Tax Asset, Lease Liability Other Income and Expenses [Abstract] Other Income and Expenses [Abstract] Due after 5 years through 10 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 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. Fair Value Measurement [Domain] Fair Value Measurement [Domain] Financial Asset, Period Past Due [Domain] Financial Asset, Aging [Domain] Financial Instruments [Domain] Financial Instruments [Domain] Two years Time Deposit Maturities, Year Two Four years Time Deposit Maturities, Year Four Unfunded Loan Commitment Unfunded Loan Commitment [Member] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Statistical Measurement [Domain] Statistical Measurement [Domain] Depreciation Depreciation Accounting Policies [Line Items] Accounting Policies [Line Items] Accounting Policies Net deferred tax assets Deferred Tax Assets, Net Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Interest on deposits Total Interest Expense, Deposits Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] 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 Additional paid-in capital Additional Paid in Capital, Common Stock Funded status: Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] Net periodic pension cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) State Current State and Local Tax Expense (Benefit) Nonperforming Loans Subject To Special Monitoring Nonperforming Loans Subject To Special Monitoring [Member] Nonperforming Loans Subject To Special Monitoring [Member] Opportunistic Opportunistic [Member] Opportunistic [Member] Purchase of common shares Treasury Stock, Value, Acquired, Cost Method PPP Paycheck protection program ("PPP") [Member] Paycheck protection program ("PPP") [Member] Net income Net income Net Income (Loss) Attributable to Parent Measurement Input Type [Domain] Measurement Input Type [Domain] Condensed Income Statement Condensed Income Statement [Table Text Block] 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 Other Other Intangible Assets [Member] Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Net amortization and deferral Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Rate of increase in compensation levels Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase Equity Component [Domain] Equity Component [Domain] Scenario [Axis] Scenario [Axis] Total Assets, Fair Value Disclosure Changes in unrecognized tax benefits as a result of tax position taken during the current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Percentage of shares vested Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage 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. Leases Lessee, Operating Leases [Text Block] State and political subdivisions US States and Political Subdivisions Debt Securities [Member] Cass Commercial Bank Cass Commercial Bank [Member] Cass Commercial Bank [Member] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Standby letters of credit Standby Letters of Credit [Member] Fair value, January 1 Fair value, December 31 Total plan assets Defined Benefit Plan, Plan Assets, Amount Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Supplemental information: Supplemental Cash Flow Information [Abstract] U.S. Passive U.S. Passive [Member] United States Passive [Member]. Interest on federal funds sold and other short-term investments Interest on federal funds sold and other short-term investments Interest income on federal funds sold and other short-term investments. Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Long-term line of credit Long-Term Line of Credit Common stock, par value $0.50 per share; 40,000,000 shares authorized; 15,505,772 shares issued at December 31, 2022 and 2021; 13,669,656 and 13,734,295 shares outstanding at December 31, 2022 and 2021, respectively. Common Stock, Value, Outstanding Entity Address, State or Province Entity Address, State or Province Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Four years Time Deposits, Weighted Average Interest Rate, Maturities Year Four Prior service cost Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax Performance-based stock vested Performance Based Stock Performance-based stock. Award Type [Axis] Award Type [Axis] Emerging Markets Emerging Markets [Member] Emerging Markets [Member]. Actuarial gain Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Decreases in unrecognized tax benefits as a result of settlements with taxing authorities Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities 2027 Defined Benefit Plan, Expected Future Benefit Payment, Year Five Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Mortgage-backed securities issued or guaranteed by U.S. government agencies or sponsored enterprises Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] FASB ASC 715 pension adjustment Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Common equity tier I capital (to risk-weighted assets), actual, amount Banking Regulation, Tier 1 Risk-Based Capital, Actual Accrued interest payable Accrued Liabilities, Fair Value Disclosure Schedule of Restricted Stock Activity Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Schedule of Investment Securities Debt Securities, Available-for-Sale [Table Text Block] Performing Loans Subject To Special Monitoring Performing Loans Subject To Special Monitoring [Member] Performing Loans Subject To Special Monitoring [Member] Other liabilities Other Liabilities Lender Name [Axis] Lender Name [Axis] Amortization of restricted stock bonus Amortization of restricted stock bonus Amount of amortization of the restricted stock bonus. Receivables [Abstract] Receivables [Abstract] Less allowance for credit losses Beginning balance Ending balance Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Profit sharing expense Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year Total fee revenue and other income Fee income Noninterest Income Document Annual Report Document Annual Report Legal Entity [Axis] Legal Entity [Axis] Commitments to extend credit Commitments to Extend Credit [Member] (Reductions) increases resulting from: (Reductions) increases resulting from: (Reductions) increases resulting from: Loans Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Unrealized loss on investment securities available-for-sale (1) Deferred Tax Asset, Debt Securities, Available-for-Sale, Unrealized Loss Total liabilities Total liabilities Liabilities Operating lease, weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Cash Flows From Investing Activities: Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Schedule of Expected Benefit Payments Schedule of Expected Benefit Payments [Table Text Block] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Common equity tier I capital (to risk-weighted assets), capital requirements, ratio Common Equity Tier I Capital (to risk-weighted assets), capital requirements ratio The minimum Common Equity Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Total deposits Deposits Investments in bank-owned life insurance Bank Owned Life Insurance Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Processing fees Processing Fees [Member] Processing Fees Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Document Type Document Type Financial Asset, Period Past Due [Axis] Financial Asset, Aging [Axis] Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Premises, useful life Property, Plant and Equipment, Useful Life Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] 2025 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Finite Lived Intangible Assets Major Class Name Domain Finite-Lived Intangible Assets, Major Class Name [Domain] Schedule of Plan's Pension Costs Schedule of Plan's Pension Costs [Table Text Block] Tabular disclosure of net periodic pension costs. Segments [Axis] Segments [Axis] Beginning balance (in dollars per share) Ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Unused Available Lines of Credit Debt Disclosure [Text Block] Product and Service [Domain] Product and Service [Domain] Entity Shell Company Entity Shell Company Deferred income tax benefit Deferred Income Tax Expense (Benefit) Information Services Information Services [Member] Information Services [Member] 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 Less than 1 year Lessee, Operating Lease, Liability, to be Paid, Year One 90 Days and Over Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Financial Instrument [Axis] Financial Instrument [Axis] Tax-exempt income Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount Consolidation Items [Domain] Consolidation Items [Domain] Document Period End Date Document Period End Date Loans Excluding Unfunded Commitments Loans Excluding Unfunded Commitments [Member] Loans Excluding Unfunded Commitments Accounts and drafts payable Accounts Payable, Fair Value Disclosure Real Estate, Faith-based, Construction Real Estate Faith-based Construction [Member] Real Estate Faith-based Construction [Member] Non- accrual Financing Receivable, Excluding Accrued Interest, Nonaccrual Tax-equivalized pre-tax income Income (Loss) from Continuing Operations Including Tax Equivalent Adjustment, Before Income Taxes, Noncontrolling Interest Income (Loss) from Continuing Operations Including Tax Equivalent Adjustment, Before Income Taxes, Noncontrolling Interest Total capital (to risk weighted assets), requirement to be well-capitalized, ratio Total capital (to risk-weighted assets), requirement to be well capitalized ratio The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action. Total assets Total assets Assets Debt Disclosure [Abstract] Debt Disclosure [Abstract] Earnings Per Share [Abstract] Earnings Per Share [Abstract] Employer contribution Defined Benefit Plan, Plan Assets, Contributions by Employer Net unrealized (loss) gain on securities available-for-sale OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Performance-based Restricted Stock Performance Shares [Member] 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 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. 4-5 years Lessee, Operating Lease, Liability, to be Paid, Year Five Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Accounting Policies [Abstract] Accounting Policies [Abstract] Shares forfeited Shares Issued, Shares, Share-Based Payment Arrangement, Forfeited 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 Asset backed securities issued or guaranteed by U.S. Government agencies or sponsored enterprises Asset-Backed Securities [Member] Income before income tax expense Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Shareholders’ Equity: Stockholders' Equity Attributable to Parent [Abstract] Segments [Domain] Segments [Domain] Release of credit losses for unfunded commitments Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Financial fees Bank Service Fees [Member] Bank Service Fees Common Stock and Earnings per Share Earnings Per Share [Text Block] Other Deferred Tax Liabilities, Other Interest cost Interest cost on projected benefit obligations Defined Benefit Plan, Interest Cost 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 Net increase in accounts and drafts payable Increase (Decrease) in Accounts Payable and Other Operating Liabilities Time deposits: Time Deposits [Abstract] Goodwill, gross carrying amount Goodwill, Gross Tax effect OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Schedule of Components of Income Tax Expense (Benefit) Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Award Type [Domain] Award Type [Domain] Plan assets, measurement input Defined Benefit Plan, Plan Assets, Measurement Input Defined Benefit Plan, Plan Assets, Measurement Input Unrecognized compensation expense, period for recognition Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition AFS, Total Unrealized Losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Payments to acquire assets Asset acquisition of TouchPoint Payments to Acquire Businesses, Gross Fair Value, by Balance Sheet Grouping Fair Value, by Balance Sheet Grouping [Table Text Block] Unamortized intangible assets: Unamortized intangible assets: Unamortized Intangible Asset Entity Registrant Name Entity Registrant Name Shares issued (in shares) Stock Issued During Period, Shares, New Issues 2026 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Subsequent Events Subsequent Events [Text Block] Loans, net Loans, net Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Patent Patents [Member] Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Entity Address, City or Town Entity Address, City or Town Employee Benefit Plans Retirement Benefits [Text Block] Interest Income: Interest and Dividend Income, Operating [Abstract] Condensed Income Statements, Captions [Line Items] Condensed Income Statements, Captions [Line Items] Leases [Abstract] Leases [Abstract] U.S. Large Cap Passive U.S. Large Cap Passive [Member] United States Large Cap Passive [Member]. Measurement Input, Expected Term Measurement Input, Expected Term [Member] Other income (out-of-scope of ASC 606) Other fees Revenue Not from Contract with Customer 2026-2030 Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Minimum Minimum [Member] Due in 1 year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Occupancy Occupancy, Net Common stock, par or stated value (in dollars per share) Common Stock, Par or Stated Value Per Share Unrecognized tax benefit, interest on income taxes accrued Unrecognized Tax Benefits, Interest on Income Taxes Accrued Share-based compensation adjustment Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount Issuance of common stock: Shares Granted or Issued, Share-Based Payment Arrangement [Abstract] 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. Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Summary of ACL by Category Summary of Allowance For Credit Loss by Category [Table Text Block] Summary of ACL by Category. Auditor Name Auditor Name Pension Plan The Plan Pension Plan [Member] Disclosures about Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Number of loans individually evaluated for impairment Number Of Loans Individually Evaluated for Impairment Number Of Loans Individually Evaluated for Impairment Trading Symbol Trading Symbol Entity File Number Entity File Number 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. 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 Amortization expense, rolling year five Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Five Amortization expense, rolling year three Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Three Marketable Securities [Line Items] Marketable Securities [Line Items] Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Effective tax rate Effective Income Tax Rate Reconciliation, Percent Schedule of Line of Credit Facilities Schedule of Line of Credit Facilities [Table Text Block] Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Exercised Other Operating Expense Other Operating Income and Expense [Text Block] $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. Loans Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Other comprehensive (loss) income: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Parent Company Parent Company [Member] Six Corresponding Banks Six Corresponding Banks [Member] Six Corresponding Banks Provision for (release of) credit losses Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) Promotional expense Marketing and Advertising Expense Subsequent Events [Abstract] Subsequent Events [Abstract] (Decrease) increase in pension liability Increase (Decrease) in Obligation, Pension Benefits Total net revenue Revenues Schedule of Other Operating Cost and Expense, by Component Schedule of Other Operating Cost and Expense, by Component [Table Text Block] Total Time Deposits Available-for-sale securities, number of positions, greater than one year Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions Investment Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Participating Mortgage Loans [Line Items] Participating Mortgage Loans [Line Items] Income Taxes Income Tax Disclosure [Text Block] State Deferred State and Local Income Tax Expense (Benefit) Aggregate intrinsic value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding Non-option equity instruments, granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted Credit Facility [Domain] Credit Facility [Domain] AFS, 12 months or more, Estimated Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Operating Expense: Noninterest Expense [Abstract] Amortization of intangible assets Amortization of Intangible Assets Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Basic Earnings Per Share (in dollars per share) Earnings Per Share, Basic 2-3 years Lessee, Operating Lease, Liability, to be Paid, Year Three Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Two Corresponding Banks Two Corresponding Banks [Member] Two Corresponding Banks Fair value of shares vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss CRE CRE [Member] CRE [Member] Treasury Stock Treasury Stock [Member] Total shareholders’ equity Beginning balance Ending balance Total shareholders’ equity Stockholders' Equity Attributable to Parent Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] 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 Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Due after 5 years through 10 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Tier I capital (to average assets), actual, amount Banking Regulation, Tier 1 Leverage Capital, Actual Outside service fees Outside service fees Outside service fees. Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Condensed Income Statement [Table] Condensed Income Statement [Table] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Revenue, Performance Obligation [Abstract] Revenue, Performance Obligation [Abstract] Other Deferred Tax Assets, Other Entity Interactive Data Current Entity Interactive Data Current Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Accumulated Amortization Total intangible assets, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Proceeds from sales of securities available-for-sale Proceeds from Sale of Debt Securities, Available-for-Sale Cass Information Systems, Inc. Cass Information Systems Inc. [Member] Cass Information Systems Inc. [Member] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Retained Earnings Retained Earnings [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Deposits Deposits, Fair Value Disclosure Cash dividends Dividends, Common Stock, Cash Plan assets: Plan assets: Plan assets: Condensed Cash Flow Statements, Captions [Line Items] Condensed Cash Flow Statements, Captions [Line Items] Common Stock Common Stock [Member] 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 Other comprehensive (loss) income Other comprehensive (loss) income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Issuance of common shares pursuant to stock-based compensation plan, net Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Number of reportable segments Number of Reportable Segments Purchase of common shares for treasury Payments for Repurchase of Common Stock Contingent consideration, earn out Business Combination, Contingent Consideration, Liability Income Taxes Income Tax, Policy [Policy Text Block] Statement [Table] Statement [Table] Cash and cash equivalents Cash, Cash Equivalents, and Short-Term Investments 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 Faith-based CRE Faith-based CRE [Member] Faith-based CRE [Member] Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] SERP Supplemental Executive Retirement Plan [Member] Supplemental Executive Retirement Plan [Member]. Finance receivable, related parties Loans and Leases Receivable, Related Parties Furniture, fixtures and equipment Furniture and Fixtures [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Treasury Stock Treasury Stock [Policy Text Block] Disclosure of accounting policy for an entity's treasury stock, including the average cost per share, carrying basis for each class of treasury stock, description of share repurchase program authorized by an entity's board of directors, the number of shares repurchased, the cost of the shares repurchased, the remaining maximum dollar value of shares available for repurchase under the program, the treatment of the purchase price in excess of the current market value, number of shares held for each class of treasury stock, and other information necessary to a fair presentation. Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Leasehold Improvements Leasehold Improvements [Member] Retained earnings Retained Earnings (Accumulated Deficit) Intangible assets Deferred Tax Liabilities, Other Finite-Lived Assets Condensed Cash Flow Statement Condensed Cash Flow Statement [Table Text Block] Due after 10 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Other operating activities, net Other, net Other Operating Activities, Cash Flow Statement Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Equity Components [Axis] Equity Components [Axis] Scenario [Domain] Scenario [Domain] Interest-bearing demand deposits Demand Deposit Accounts Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] Comprehensive Income Comprehensive Income, Policy [Policy Text Block] Percentage of target opportunity for awards to vest Percentage of target opportunity for awards to vest Percentage of target opportunity for awards to vest. AFS, Less than 12 months, Estimated Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Tax effect Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Document Fiscal Year Focus Document Fiscal Year Focus Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Cash Flows From Operating Activities: Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [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. Statement [Line Items] Statement [Line Items] Research and development expenses Deferred Tax Assets, in Process Research and Development Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Unappropriated retained earnings Retained Earnings, Unappropriated Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Gross Carrying Amount Finite-Lived Intangible Assets, Gross Condensed Balance Sheet Condensed Balance Sheet [Table Text Block] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Contingent consideration, change in amount of contingent consideration, liability Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 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. Product Product [Member] Operating lease, right-of-use asset Operating Lease, Right-of-Use Asset Gross Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Auditor Firm ID Auditor Firm ID Reclassification adjustments for gains included in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Document Transition Report Document Transition Report 2024 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Other Other Loan [Member] Other Loan Local Phone Number Local Phone Number Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] 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. Impact of New and Not Yet Adopted Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Tier I capital (to risk-weighted assets), requirement to be well-capitalized, ratio Tier I capital (to risk-weighted assets), requirement to be well capitalized ratio The 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. Interest-Bearing Deposits [Abstract] Interest-Bearing Deposits [Abstract] Interest-Bearing Deposits [Abstract] Tax equivalent adjustment Income Tax Effects Allocated Directly to Equity, Prior Period Adjustment Stock compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost Premium related to purchase of state and political subdivisions Premium related to purchase of state and political subdivisions The premium related to the purchase of state and political subdivisions. Common stock, shares, outstanding (in shares) Common Stock, Shares, Outstanding Investments in subsidiaries Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Service Service [Member] Goodwill Goodwill Amortization expense, rolling year two Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Two Treasury stock (in shares) Treasury Stock, Shares Total Liabilities, Fair Value Disclosure Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Actual investment return Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Shares repurchased Stock Repurchased During Period, Shares International (Developed) International (Developed) [Member] Foreign Equity Securities Developed [Member] Tier I capital (to average assets), requirement to be well-capitalized, ratio Tier I capital (to average assets), requirement to be well capitalized ratio The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action. Payments in advance of funding Payments In Advance Of Funding The normal cycle for payment of Transportation invoices to a carrier, on behalf of the company's customer, is: the customer provides the funds to the company prior to the payment of the invoice by the company to the carrier. 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. Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to reconcile net income to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Acquired Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Income tax expense Total income tax expense Income Tax Expense (Benefit) Premises and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Schedule of Maturities of Time Deposits Schedule of Maturities of Time Deposits [Table Text Block] Schedule of maturities of time deposits. Preferred stock, par or stated value per share (in dollars per share) Preferred Stock, Par or Stated Value Per Share 3-4 years Lessee, Operating Lease, Liability, to be Paid, Year Four Income Statement [Abstract] Income Statement [Abstract] Entity Public Float Entity Public Float Federal Deferred Federal Income Tax Expense (Benefit) Additional Paid-in Capital Additional Paid-in Capital [Member] Document Fiscal Period Focus Document Fiscal Period Focus Tier I capital (to average assets), capital requirements, amount Banking Regulation, Tier 1 Leverage Capital, Capital Adequacy, Minimum Adjusted Balance Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Basic: Earnings Per Share, Basic [Abstract] Tier I capital (to risk-weighted assets), capital requirements, amount Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy, Minimum Prepaid expenses Deferred Tax Liabilities, Prepaid Expenses Weighted average common shares outstanding assuming dilution (in shares) Weighted Average Number of Shares Outstanding, Diluted Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Interest-bearing demand deposits Interest Expense, Demand Deposit Accounts Interest and fees on loans Interest and Fee Income, Loans and Leases 2023 Defined Benefit Plan, Expected Future Benefit Payment, Year One One-Year Nominal Return One-Year Nominal Return The expected percentage of one-year nominal return on assets. Cash dividends (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Carrying Amount Reported Value Measurement [Member] Tier I capital (to risk-weighted assets), requirement to be well-capitalized, amount Banking Regulation, Tier 1 Risk-Based Capital, Well Capitalized, Minimum Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Banking Services Banking Services [Member] Banking Services [Member] Summary of Loan Categories Summary of Loan Categories [Table Text Block] Tabular disclosure for loan categories. 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 Employee restricted stock grants Stock Issued During Period, Shares, Restricted Stock Award, Gross Operating Segments Operating Segments [Member] Less than $100 Time Deposits, Less than $100,000 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. Accounts and drafts receivable from customers Receivables from Customers Short-term lease, cost Short-Term Lease, Cost Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Accrued interest receivable Accrued Interest Receivable, Fair Value Disclosure Accrued Interest Receivable, Fair Value Disclosure Reduction of tax benefits over the next twelve months Decrease in Unrecognized Tax Benefits is Reasonably Possible Tier I capital (to average assets), requirement to be well-capitalized, amount Banking Regulation, Tier 1 Leverage Capital, Well Capitalized, Minimum 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 Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Supplemental executive retirement plan accrual Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Pension Deferred Tax Liabilities Pension Costs Deferred tax liabilities, pension costs. Schedule of Performance Shares Activity Share-Based Payment Arrangement, Performance Shares, Outstanding Activity [Table Text Block] Common stock, shares issued (in shares) Common Stock, Shares, Issued Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Amount First Seven Years Of Service SERP, Year One Through Seven [Member] SERP, Year One Through Seven Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments [Table Text Block] Data processing services Information Technology and Data Processing Retirement Plan Type [Domain] Retirement Plan Type [Domain] Average remaining contractual terms Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms Available-for-sale securities, number of positions Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions AFS, Total Estimated Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position Amendment Flag Amendment Flag Expenses: Expenses: Expenses: Remaining operating lease term Lessee, Operating Lease, Remaining Lease Term Finite-lived, intangible assets, useful life Finite-Lived Intangible Asset, Useful Life Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Operating lease, cost Operating Lease, Cost U.S. Small/Mid Cap Growth U.S. Small/Mid Cap Growth [Member] United States Small And Mid Cap Growth [Member]. Pension Plan, Year One Through Seven Pension Plan, Year One Through Seven [Member] Pension Plan, Year One Through Seven Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent One year Time Deposits, Weighted Average Interest Rate, Maturities Year One Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Gross Unrealized Gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Tax effect Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Entity Current Reporting Status Entity Current Reporting Status Condensed Financial Information Disclosure [Abstract] Condensed Financial Information Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Unrealized gain on investment securities available-for-sale Deferred Tax Liabilities, Unrealized Gains on Trading Securities Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Schedule of Stock Appreciation Right Activity Share-Based Payment Arrangement, Stock Appreciation Right, Activity [Table Text Block] Non-U. S. Core Non-U.S. Core [Member] Non United States Core [Member]. Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Corporate, Eliminations and Other Corporate, Reconciling Items, And Eliminations [Member] Corporate, Reconciling Items, And Eliminations Securities available-for-sale, at fair value Fair Value Total Debt Securities, Available-for-Sale, Excluding Accrued Interest Total interest income Interest and Dividend Income, Operating Two years Time Deposits, Weighted Average Interest Rate, Maturities Year Two Average funding sources Average Funding Sources Average Funding Sources 30-59 Days Financial Asset, 30 to 59 Days Past Due [Member] Schedule of Interest on Deposits Schedule of Interest on Deposits [Table Text Block] Tabular disclosure of interest expense on deposit accounts. Total intangible assets, net Intangible Assets, Net (Including Goodwill) Finite lived intangible assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Purchase of bank-owned life insurance Payment to Acquire Life Insurance Policy, Investing Activities Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code SARs Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Liabilities: Liabilities [Abstract] Premises and equipment, net Total premises and equipment, net Property, Plant and Equipment, Net Internally developed software Internally Developed Software [Member] Internally Developed Software [Member] Schedule of Interest Bearing Deposits Schedule of Interest Bearing Deposits [Table Text Block] Tabular disclosure of interest bearing deposits. Asset acquisition of TouchPoint Payments for Asset Acquisitions Payments for Asset Acquisitions Lease payments due Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Operating lease, payments Operating Lease, Payments Amortization [Abstract] Amortization [Abstract] Personnel Salaries and employee benefits Labor and Related Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Common shares in treasury, at cost (1,836,116 shares at December 31, 2022 and 1,771,477 shares at December 31, 2021, respectively) Treasury Stock, Value Employee SARs exercised Employee SARs exercised Number of share options and stock appreciation rights exercised during the current period. Allowance for credit losses Deferred Tax Asset, Tax Deferred Expense, Reserve and Accrual, Financing Receivable, Allowance for Credit Loss 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. Total loans Total Loans Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss, Current Exercise of SARs Stock Issued During Period, Value, Stock Options Exercised Forfeitures (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Common stock, shares authorized (in shares) Common Stock, Shares Authorized Cash and due from banks Cash and Due from Banks Annual Standard Deviation Annual Standard Deviation The expected percentage of annual standard deviation on assets. Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Maximum Maximum [Member] Accumulated other comprehensive (loss) income Accumulated Other Comprehensive Income (Loss), Net of Tax Condensed Financial Information of Parent Company Condensed Financial Information of Parent Company Only Disclosure [Text Block] Loans Financing Receivable [Policy Text Block] Issuance of common shares pursuant to stock-based compensation plan, net (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, before Forfeiture Expected long-term rate of return on assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets Cash and cash equivalents at beginning of year Cash and cash equivalents at end of year Cash and Cash Equivalents, at Carrying Value Capital Requirements and Regulatory Restrictions Regulatory Capital Requirements under Banking Regulations [Text Block] Condensed Cash Flow Statement [Table] Condensed Cash Flow Statement [Table] Common equity tier I capital (to risk-weighted assets), capital requirements, amount Common Equity Tier I Capital (to risk-weighted assets), capital requirements amount The minimum amount of Common Equity Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. Construction Construction [Member] Cash paid for income taxes Income Taxes Paid, Net 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 Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Entity Small Business Entity Small Business Measurement Basis [Axis] Measurement Basis [Axis] Other Commitments [Table] Other Commitments [Table] Shares outstanding at January 1 Shares outstanding at December 31 Shares, Outstanding Interest income Interest and Dividend Income, Including Tax Equivalent Adjustment, Operating Interest and Dividend Income, Including Tax Equivalent Adjustment, Operating Fee Revenue and Other Income: Revenues [Abstract] Five years Time Deposit Maturities, Year Five Three years Time Deposits, Weighted Average Interest Rate, Maturities Year Three Credit Exposure Of Loan Portfolio [Axis] Credit Exposure Of Loan Portfolio [Axis] Credit exposure Of Loan Portfolio [Domain] Line of Credit Facility [Table] Line of Credit Facility [Table] Beginning balance (in dollars per share) Ending balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Weighted Average Exercise Price Purchases of securities available-for-sale Net decrease (increase) in securities Payments to Acquire Debt Securities, Available-for-Sale Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Processing Fees Processing Fees [Policy Text Block] The accounting policy for processing fees. Taxable Interest Income, Securities, Operating, Taxable Unrecognized compensation expense Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Purchased software Software Computer Software, Intangible Asset [Member] Premises and Equipment Property, Plant and Equipment Disclosure [Text Block] Percentage holding required to account investments under non-marketable equity investments Percentage holding required to account investments under non-marketable equity investments The percentage holding required to account investments under non-marketable equity investments. Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Loans Subject To Normal Monitoring Loans Subject To Normal Monitoring [Member] Loans Subject To Normal Monitoring [Member] (Increase) decrease in accounts receivable Increase (Decrease) in Accounts Receivable Title of 12(b) Security Title of 12(b) Security Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Consolidated Entities [Axis] Consolidated Entities [Axis] Short-term investments Short-Term Investments Schedule of Unrecognized Tax Benefits Roll Forward Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Net decrease in time deposits Increase (Decrease) in Time Deposits Accounting Policies [Table] Accounting Policies [Table] Accounting Policies Directors’ stock grants Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture AFS, Less than 12 Months, Unrealized Losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Operating lease, liability Total lease liability Operating Lease, Liability Industry Segment Information Segment Reporting Disclosure [Text Block] Stock-Based Compensation Share-Based Payment Arrangement [Policy Text Block] Net amortization of premium/discount on investment securities Accretion (Amortization) of Discounts and Premiums, Investments Large Cap U.S. Equities Large Cap U.S. Equities [Member] Equity Securities Large Cap [Member] Schedule of Intangible Assets and Goodwill Schedule of Intangible Assets and Goodwill [Table Text Block] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Core Fixed Income Fixed Income Funds [Member] AFS, 12 months or more, Unrealized Losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total deferred tax liabilities Deferred Tax Liabilities, Net Five years Time Deposits, Weighted Average Interest Rate, Maturities Year Five Allowance for credit losses on loans: Financing Receivable, Allowance for Credit Loss [Roll Forward] Liabilities and Shareholders’ Equity Liabilities and Equity [Abstract] Fair Value Estimate of Fair Value Measurement [Member] Time Deposits, Fiscal Year Maturity [Abstract] Time Deposits, Fiscal Year Maturity [Abstract] Treasury securities US Treasury Securities [Member] Benefits paid Benefits paid Defined Benefit Plan, Plan Assets, Benefits Paid Purchase of common shares (in shares) Stock Issued During Period, Shares, Purchase of Assets Exempt from federal income taxes Interest Income, Securities, Operating, Tax Exempt Federal Home Loan Bank Federal Home Loan Bank [Member] Federal Home Loan Bank [Member] Recoveries Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery Savings deposits Interest Expense, Savings Deposits Other Other Expenses Deferred tax assets: Deferred Tax Assets, Net [Abstract] Summary of Operations Summary of Operations [Policy Text Block] Summary of Operations. Comprehensive Income: Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Net change in other assets Increase (Decrease) in Other Operating Assets Other Bank Service Fees and Other Revenue Not From Contract With Customer Bank Service Fees and Other Revenue Not From Contract With Customer Loans, net Loans Receivable, Fair Value Disclosure Measurement Input, Long Term Rate Of Return Measurement Input, Long Term Rate Of Return [Member] Measurement Input, Long Term Rate Of Return Non-U.S. Equity Securities Non-U.S. Equity Securities [Member] Foreign Equity Securities [Member]. Auditor Location Auditor Location Entity Filer Category Entity Filer Category Weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Federal Current Federal Tax Expense (Benefit) Commercial letters of credit Commercial letters of credit [Member] Commercial letters of credit member. Commercial and industrial Commercial and Industrial [Member] Commercial And Industrial Loan Security Exchange Name Security Exchange Name Gains on sales of securities Debt and Equity Securities, Gain (Loss) Plan assets, target allocation percentage % of Total Portfolio Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Condensed Balance Sheet Statements, Captions [Line Items] Condensed Balance Sheet Statements, Captions [Line Items] Weighted Average Exercise Price Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Preferred stock, par value $0.50 per share; 2,000,000 shares authorized and no shares issued Preferred Stock, Value, Issued Restricted Stock Restricted Stock [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Schedule of Debt Schedule of Debt [Table Text Block] Balance sheet liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Fee revenues Fee revenues Revenue from Contract with Customer, Excluding Assessed Tax Corporate bonds Corporate Bond Securities [Member] Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Increase in current income tax liability Increase (Decrease) in Income Taxes Payable Service cost Service cost – benefits earned during the year Defined Benefit Plan, Service Cost Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Weighted average interest rate Weighted average interest rate The weighted average interest rate of interest bearing deposits. 60-89 Days Financial Asset, 60 to 89 Days Past Due [Member] Cash Cash and Cash Equivalents [Member] Cover [Abstract] Interest on short-term borrowings Interest Expense, Short-Term Borrowings Entity Voluntary Filers Entity Voluntary Filers Income before income tax and equity in undistributed income of subsidiaries Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest International (Emerging) International (Emerging) [Member] Foreign Equity Securities Emerging [Member ] Total capital (to risk-weighted assets), capital requirements, amount Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum Stock-based Compensation Share-Based Payment Arrangement [Text Block] Other assets Other Assets Financial Fees Financial Fees [Policy Text Block] Financial Fees Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Projected benefit obligation: Benefit obligation: Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Estimated Forecast [Member] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] Net interest income Intersegment income (expense) Interest Income (Expense), Net Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Weighted average discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Net actuarial loss in accumulated other comprehensive loss Defined Benefit Plan, Amortization of Gain (Loss) Total liabilities and shareholders’ equity Liabilities and Equity Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Federal tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Amount Interest-Bearing Deposits Deposit Liabilities Disclosures [Text Block] Land Land [Member] Diluted: Earnings Per Share, Diluted [Abstract] 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. Schedule of Common Stock Outstanding Roll Forward Schedule of Common Stock Outstanding Roll Forward [Table Text Block] Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Real Estate, Commercial, Mortgage Real Estate Commercial Mortgage [Member] Real Estate Commercial Mortgage Net 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. Current Fiscal Year End Date Current Fiscal Year End Date Savings deposits Deposits, Savings Deposits Available-for-sale securities, gross realized gains Debt Securities, Available-for-Sale, Realized Gain Discount on cash flows Lessee, Operating Lease, Liability, Undiscounted Excess Amount Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Diluted Earnings Per Share (in dollars per share) Earnings Per Share, Diluted Other intangible assets, net Intangible Assets, Net (Excluding Goodwill) 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. Accumulated benefit obligation Defined Benefit Plan, Accumulated Benefit Obligation Award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Stock-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Consolidation Items [Axis] Consolidation Items [Axis] 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 Audit Information [Abstract] Audit Information [Abstract] Interest and dividends on securities: Interest and Dividend Income, Securities, by Taxable Status [Abstract] 1-2 years Lessee, Operating Lease, Liability, to be Paid, Year Two Noncontributory Profit Sharing Program Noncontributory Profit Sharing Program [Member] Noncontributory Profit Sharing Program [Member] Due after 10 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Net interest income after provision for (release of) credit losses Net interest income after provision for (release of) credit losses Interest Income (Expense), after Provision for Loan Loss U.S. Core U.S. Core Opportunistic [Member] United States Core Opportunistic [Member]. Balance at January 1 Balance at December 31 Unrecognized Tax Benefits Total deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Foreclosed Assets Financing Receivable, Held-for-investment, Foreclosed Asset [Policy Text Block] Marketable Securities [Table] Marketable Securities [Table] Equity Securities Equity Securities [Member] Provision for (release of) credit losses Provision for (release of) credit losses Financing Receivable, Credit Loss, Expense (Reversal) Unrecognized tax benefits that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] 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 Weighted average discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Lessee, Operating Lease, Liability, Maturity Lessee, Operating Lease, Liability, Maturity [Table Text Block] Entity Address, Address Line Two Entity Address, Address Line Two Entity Address, Address Line One Entity Address, Address Line One Other financing activities, net Proceeds from (Payments for) Other Financing Activities Product and Service [Axis] Product and Service [Axis] Balance sheet assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Exercised (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercises in Period, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercises in Period, Weighted Average Exercise Price Deferred tax liabilities: Deferred Tax Liabilities, Net [Abstract] Net decrease in short-term borrowings Proceeds from (Repayments of) Short-Term Debt Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets $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 Total capital (to risk weighted assets), requirement to be well-capitalized, amount Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Income before undistributed income of subsidiaries Income before undistributed income of subsidiaries. Income before undistributed income of subsidiaries. Total interest expense Interest expense Interest Expense Trade Name Trade Names [Member] Non-marketable Equity Investments Equity Method Investments [Policy Text Block] Credit Facility [Axis] Credit Facility [Axis] Retirement Plan Type [Axis] Retirement Plan Type [Axis] Intangible assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Acquired Including Goodwill Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Acquired Including Goodwill 401(k) employer contribution amount Defined Contribution Plan, Employer Discretionary Contribution Amount Right of use asset Deferred Tax Liabilities, Leasing Arrangements Buildings Building [Member] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Entity Tax Identification Number Entity Tax Identification Number Number of shares authorized (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Accrued pension liability Defined Benefit Plan, Funded (Unfunded) Status of Plan 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 Touchpoint Touchpoint [Member] Touchpoint Customer lists Customer Lists [Member] Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Time deposits: Interest Expense, Time Deposits [Abstract] 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. Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Consolidated Entities [Domain] Consolidated Entities [Domain] Financial fees Financial Fees [Member] Financial Fees Expenses paid from plan assets Defined Benefit Plan, Plan Assets, Administration Expense Current Financial Asset, Not Past Due [Member] Net actuarial loss (gain) Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Net (decrease) increase in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect State taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Effect of dilutive restricted stock, performance based restricted stock (“PBRS”), and SARs (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment Contingent consideration, measurement input Business Combination, Contingent Consideration, Liability, Measurement Input Restricted securities Debt Securities, Available-for-Sale, Restricted 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. Income from subsidiaries – management fees Investment Income, Nonoperating Other intangible assets, net Other Intangible Assets, Net Entity Central Index Key Entity Central Index Key Amortization expense, rolling year four Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Four Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Employee restricted stock units vested Stock Issued During Period, Shares, Conversion of Units Number of troubled debt restructured loans Financing Receivable, Modifications, Number of Contracts Interest-bearing Total Interest-Bearing Deposit Liabilities Allowance for Credit Losses Credit Loss, Financial Instrument [Policy Text Block] Measurement Input Type [Axis] Measurement Input Type [Axis] Entity [Domain] Entity [Domain] 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. City Area Code City Area Code Assets Assets [Abstract] Total Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax Pension Plans Pension and Other Postretirement Plans, Policy [Policy Text Block] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Deposits Deposits, by Type [Abstract] Other Commitments [Line Items] Other Commitments [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Noninterest-bearing Noninterest-Bearing Deposit Liabilities Expected income tax expense Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Proceeds from maturities of securities available-for-sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Allowance for unfunded commitments Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments Property, Plant and Equipment, Other Types Property, Plant and Equipment, Other Types [Member] Interest Expense: Interest Expense [Abstract] Pension Plan, Service After Year Seven Pension Plan, Service After Year Seven [Member] Pension Plan, Service After Year Seven Cash Flows From Financing Activities: Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] $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. Earnings Per Share Earnings Per Share, Policy [Policy Text Block] Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Equipment Equipment Expense 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. Less than $100 Interest Expense, Time Deposits, Less than $100,000 Equity in undistributed income of subsidiaries Equity in undistributed income of subsidiaries Income (Loss) from Equity Method Investments Total operating expense Noninterest Expense Other operating Total other operating expense Other Noninterest Expense Schedule of Assumptions used to Determine Projected Benefit Obligation Schedule of Assumptions used to Determine Projected Benefit Obligation [Table Text Block] Tabular disclosure for assumptions used calculating benefit obligation. 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 Other Operating Liabilities Increase (Decrease) in Other Operating Liabilities Fair Value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Purchases of premises and equipment, net Payments to Acquire Property, Plant, and Equipment ASC 715 pension funding liability Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions (Increase) decrease in payments in advance of funding Net (increase) decrease 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. Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] After Year Seven SERP, Service After Year Seven [Member] SERP, Service After Year Seven Investment in Debt Securities Investment in Debt Securities [Policy Text Block] Disclosure of accounting policy for investments in debt securities. Beginning balance Ending balance Defined Benefit Plan, Benefit Obligation Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Available-for-sale securities, gross realized losses Debt Securities, Available-for-Sale, Realized 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. Three years Time Deposit Maturities, Year Three Individually Evaluated Loans Impairment of Loans [Policy Text Block] Disclosure of accounting policy for impairment of loans.