Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year Debt and Equity Securities, FV-NI [Line Items] Debt and Equity Securities, FV-NI [Line Items] Amortized Cost, Estimated Fair Value and Allowance for Credit Losses of Securities Available for Sale Debt Securities, Available-for-Sale [Table Text Block] Commodity Contract [Member] Commodity Contract [Member] Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] Expected return on plan assets, net of expenses Defined Benefit Plan, Expected Return (Loss) on Plan Assets Guaranteed by the Texas PSF [Member] Guaranteed by the Texas PSF [Member] Guaranteed by the Texas PSF [Member] Award Timing Predetermined Award Timing Predetermined [Flag] Total securities available for sale and transferred securities, Tax Expense (Benefit) OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax Entity File Number Entity File Number Modeled Expected Credit Losses [Member] Modeled Expected Credit Losses [Member] Modeled Expected Credit Losses [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Net of Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Tabular List, Table Tabular List [Table Text Block] Deferred tax expense (benefit) Total other comprehensive income (loss), Tax Expense (Benefit) Other Comprehensive Income (Loss), Tax Restricted Stock or Unit Expense Restricted Stock or Unit Expense Estimated Fair Values of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Weighted Average Risk Grades for All Commercial Loans by Class and Year of Origination Weighted Average Risk Grades for All Commercial Loans by Class and Year of Origination [Table 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Employee Stock Purchase Plans Current income tax expense Current Income Tax Expense (Benefit) Fair value Financing Receivable, Excluding Accrued Interest, Impaired, Fair Value Financing Receivable, Excluding Accrued Interest, Impaired, Fair Value Gross Amount Recognized, Financial assets Financial Assets Gross Financial Assets Gross Adjustment to Compensation, Amount Adjustment to Compensation Amount Accrued interest receivable and other assets Increase (Decrease) in Other Operating Assets Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Forward Contracts – Assets Notional Amount Derivative Asset, Notional Amount Employee Stock Option Share-Based Payment Arrangement, Option [Member] Consumer Loan [Member] Consumer Loan [Member] Cash dividends – common stock ($1.00 per share YTD in 2026 and $0.95 per share YTD in 2025) Dividends, Common Stock, Cash Total shareholders’ equity Total shareholders’ equity at beginning of period Total shareholders’ equity at end of period Equity, Attributable to Parent Accumulated Other Comprehensive Income (Loss) [Roll Forward] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Accumulated Other Comprehensive Income (Loss) [Roll Forward] Financial Instruments Eligible for Offset Consolidated Balance Sheet Financial Instruments Derivatives Assets And Liabilities And Resell Agreements Net Table [Table Text Block] Financial Instruments Derivatives Assets And Liabilities And Resell Agreements Net [Table Text Block] Insider Trading Policies and Procedures [Line Items] Common stock, shares authorized Common Stock, Shares Authorized Unsettled securities transactions Increase (Decrease) in Payable to Broker-Dealer and Clearing Organization Oil/Natural Gas Derivative Liabilities, Estimated Fair Value Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value Credit loss expense (benefit) Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Period Increase (Decrease) Leverage Ratio, Required to be Considered Well Capitalized, Capital Amount Banking Regulation, Tier 1 Leverage Capital, Well Capitalized, Minimum Common Equity Tier 1 to Risk-Weighted Assets, Required To Be Considered Well Capitalized, Capital Amount Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Well Capitalized, Minimum Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Maximum [Member] Maximum [Member] Loans foreclosed and transferred to other real estate owned and foreclosed assets Real Estate Owned, Transfer to Real Estate Owned Debt Securities, Available-for-sale, Unrealized Loss Position Debt Securities, Available-for-Sale, Unrealized Loss Position Cash collateral on deposit with other financial institutions Cash Collateral for Borrowed Securities Available for Sale, Due after ten years, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Non-Banks [Member] Non Banks [Member] Non-Banks [Member] Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Capital Amount Banking Regulation, Tier 1 Risk-Based Capital, Well Capitalized, Minimum Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Net Amount Recognized, Resell agreements, Financial Assets Securities Borrowed, Not Subject to Master Netting Arrangement Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Counterparty E Counterparty E [Member] Counterparty E Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Other consumer real estate loans [Member] Other consumer real estate loans [Member] Other consumer real estate loans [Member] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Series B Preferred Stock [Member] Series B Preferred Stock [Member] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Interest-bearing deposits Interest Income, Deposits with Financial Institutions Trust Preferred Securities Tier Two Capital Allowable Portion [Member] Trust Preferred Securities Tier Two Capital Allowable Portion [Member] Trust Preferred Securities Tier Two Capital Allowable Portion [Member] Income before income taxes Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Leverage Ratio, Actual, Ratio Banking Regulation, Tier 1 Leverage Capital Ratio, Actual Securities: Interest and Dividend Income, Securities, by Taxable Status [Abstract] Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan Lease Commitments, Components of Lease Expense [Table Text Block] Lease Commitments, Components of Lease Expense [Table Text Block] [Table Text Block] for Lease Commitments, Components of Lease Expense [Table] Leverage Ratio, Minimum Capital Required Plus Capital Conservation Buffer, Ratio Tier One Leverage Capital Required for Capital Adequacy to Average Assets Minimum Capital Required Plus Capital Conservation Buffer, Ratio Tier One Leverage Capital Required for Capital Adequacy to Average Assets Minimum Capital Required Plus Capital Conservation Buffer, Ratio Proceeds from sales of premises and equipment Proceeds from Sale of Property, Plant, and Equipment Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Additional Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] 2025 [Member] 2025 [Member] 2025 Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Held to Maturity, Due in one year or less, Amortized Cost Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Year One Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage Net (premium amortization) discount accretion Investment Income, Net, Amortization of Discount and Premium Net Amount Recognized, Financial Liabilities Net Amount Recognized, Total Financial Liabilities Financial Liabilities Derivatives And Repurchase Agreements Net Financial Liabilities Derivatives And Repurchase Agreements Net Document Fiscal Period Focus Document Fiscal Period Focus Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Award Timing Method Award Timing Method [Text Block] Award Type [Axis] Award Type [Axis] Adjustments for New Accounting Pronouncements [Axis] Accounting Standards Update [Axis] Trading Symbol Trading Symbol Trust and investment management fees Trust and investment management fees Income from services rendered by trust departments or by any consolidated subsidiaries acting in a fiduciary capacity, including fees earned for (1) acting as an agent for fiduciary placement and loans and (2) custody or investment advisory services when such fees are not separately billed to the customer. This item excludes commissions and fees received for the accumulation or disbursement of funds deposited to Individual Retirement or Keogh plan accounts when such are not handled by the reporting entity's trust department. Tax-exempt Interest Income, Securities, Operating, Tax Exempt Financial Institution Counterparties Securities Interest Rate Swaps Assets Financial Institution Counterparties Securities Interest Rate Swaps Assets [Member] Financial Institution Counterparties Securities Interest Rate Swaps Assets Entity Address, City or Town Entity Address, City or Town Net mark-to-market gains (losses) Debt Securities, Trading, Unrealized Gain (Loss) Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Statement of Income Location, Balance [Domain] Statement of Income Location, Balance [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Prior Years [Member] Prior Years [Member] Prior Years [Member] Consumer Loans Year of Origination [Domain] Consumer Loans Year of Origination [Domain] [Domain] for Consumer Loans Year of Origination [Axis] Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged Regulatory Agency [Axis] Regulatory Agency [Axis] Entity Emerging Growth Company Entity Emerging Growth Company Common Equity Tier 1 to Risk-Weighted Assets, Actual , Ratio Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual prior stock repurchase plans prior stock repurchase plans [Member] prior stock repurchase plans [Member] Debt Securities, Held-to-maturity [Table Text Block] Debt Securities, Held-to-Maturity [Table Text Block] Gross Amounts Not Offset Collateral, Derivatives, Financial Liabilities Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Amount of gain (loss) included in income (expense) Derivative, Gain (Loss) on Derivative, Net Total non-interest income Total non-interest income Noninterest Income Net (gain) loss on sale/write-down of assets/foreclosed assets Gain (Loss) on Disposition of Other Assets Securities held to maturity, net of allowance for credit losses of $500 at both March 31, 2026 and December 31, 2025 Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss Defined-benefit post-retirement benefit plans: Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract] A [Member] A [Member] A [Member] Loans Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Non-interest expense: Noninterest Expense [Abstract] Cash and due from banks Cash and Due from Banks Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing Stock option exercises/stock unit conversions (28,958 shares YTD in 2026 and 103,936 shares YTD in 2025) Stock Issued During Period, Value, Stock Options Exercised 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] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Held to Maturity, Due after one year through five years, Estimated Fair Value Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Income taxes Income tax expense, as reported Income tax expense (benefit) Income Tax Expense (Benefit) Accrued interest receivable and other assets Other Assets Preferred stock, shares issued Preferred Stock, Shares Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Designated as Hedging Instrument [Member] Designated as Hedging Instrument [Member] Total deposits not covered by deposit insurance Deposit Liability, Uninsured Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Offsetting [Abstract] Offsetting [Abstract] Held to Maturity, Due in one year or less, Estimated Fair Value Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Maximum percentage loan related to single industry Maximum Percentage Of Loan Related To Single Industry Maximum Percentage of Loan Related To Single Industry Not Guaranteed or Pre-Refunded [Member] Not Guaranteed or Pre-Refunded [Member] Not Guaranteed or Pre-Refunded [Member] Average assets (in millions) Segment Reporting, Average Assets Segment Reporting Average Assets Operating Lease, Right-of-Use Asset, Amortization Expense Operating Lease, Right-of-Use Asset, Periodic Reduction Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Proceeds from stock option exercises Proceeds from Stock Options Exercised Income Tax Paid, Federal, after Refund Received Income Tax Paid, Federal, after Refund Received All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Other Noninterest Income, Other Operating Income Beginning Balance, Number of Shares/Units Ending Balance, Number of Shares/Units Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Foreign currency forward contracts [Member] Foreign Currency Forward Contracts [Member] Foreign Currency Forward Contracts [Member] Net cash from operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Line Items] Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Line Items] [Line Items] for Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Table] Sales Proceeds from sales Proceeds from Sale of Debt Securities, Available-for-Sale Preferred stock, par value Preferred Stock, Par or Stated Value Per Share Net interest income Net interest income (expense) Interest Income (Expense), Operating Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Frost Wealth Advisors [Member] Frost Wealth Advisors [Member] Frost Wealth Advisors [Member] Tier 1 Capital to Risk-Weighted Assets, Actual, Capital Amount Banking Regulation, Tier 1 Risk-Based Capital, Actual Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Remaining contractual maturity of the agreements greater than 90 Days Remaining contractual maturity of the agreements greater than 90 Days Remaining contractual maturity of the agreements greater than 90 Days Gross Amount Recognized, Derivatives, Financial Liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset Equity Components [Axis] Equity Components [Axis] Short-duration insurance contracts, discounted liabilities [Line Items] Short-Duration Insurance Contracts, Discounted Liabilities [Line Items] Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Weighted-average strike rate for outstanding interest rate caps Weighted Average Strike Rate Outstanding Interest Rate Caps Weighted Average Strike Rate Outstanding Interest Rate Caps Loans and Leases Receivable Disclosure [Table] Loans and Leases Receivable Disclosure [Table] Standby Letters of Credit [Member] Standby Letters of Credit [Member] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Securities available for sale and transferred securities, Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit) Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Number of Reportable Segments Number of Reportable Segments Gross Amount Offset, Financial assets Financial Assets Gross Offset Financial Assets Gross Offset Customer counterparties Loan/lease interest rate swaps assets [Member] Customer Counterparties Loan Lease Interest Rate Swaps Assets [Member] Customer Counterparties Loan Lease Interest Rate Swaps Assets [Member] Entity Address, State or Province Entity Address, State or Province Investment in Loans Related to Allowance for Loan Losses by Portfolio Segment Disaggregated Based on Impairment Methodology Investment In Loans Related To Allowance For Loan Losses By Portfolio Segment Disaggregated Based On Impairment Methodology Table [Table Text Block] Investment In Loans Related To The Allowance For Loan Losses By Portfolio Segment Disaggregated Based On Impairment Methodology Total interest income Interest income Interest and Dividend Income, Operating Financial Asset, Period Past Due [Domain] Financial Asset, Aging [Domain] 2024 [Member] 2024 [Member] 2024 Weighted-Average Interest Rate Received [Member] Weighted Average Interest Rate Received [Member] Weighted-Average Interest Rate Received [Member] Individual: Individual [Axis] Disclosure Text Block [Abstract] Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] Cash dividends paid on common stock Payments of Ordinary Dividends, Common Stock Entities [Table] Entities [Table] Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required Plus Capital Conservation Buffer, Capital Amount Common Equity Tier One Capital Required For Capital Adequacy Minimum Capital Required Plus Capital Conservation Buffer Common Equity Tier One Capital Required For Capital Adequacy Minimum Capital Required Plus Capital Conservation Buffer Texas Leading Index economic condition indicator Texas Leading Index Economic Condition Indicator Texas Leading Index economic condition indicator Financing Receivables, 30 to 89 Days Past Due [Member] Financing Receivables, 30 to 89 Days Past Due [Member] Financing Receivables, 30 to 89 Days Past Due [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Entity Interactive Data Current Entity Interactive Data Current Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Table] Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Table] Remaining Contractual Maturity of the Securities Sold Under Agreement to Repurchase [Table] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Financing Receivable, Troubled Debt Restructuring [Line Items] Financing Receivable, Modified [Line Items] Home Equity Line of Credit [Member] Home Equity Line of Credit [Member] Interest income: Interest and Dividend Income, Operating [Abstract] Gross Amounts Not Offset Financial Instruments, Resell Agreements Security Purchased under Agreement to Resell, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Held-to-maturity Securities [Member] Held-to-Maturity Securities [Member] Total non-interest expense Total non-interest expense Noninterest Expense Disclosure of Share-based Compensation Arrangements by Share-based Payment Award Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] Payment Deferral Payment Deferral [Member] Deposits Interest Expense, Deposits Financing Receivable, Year One, Originated, Current Fiscal Year Financing Receivable, Year One, Originated, Current Fiscal Year Non-interest income: Noninterest Income [Abstract] Interest-bearing Domestic Deposit, Money Market Interest-Bearing Domestic Deposit, Money Market Gross Amount Offset, Derivatives, Financial liabilities Derivative Liabilities Gross Offset Derivative Liabilities Gross Offset Risk Grade One To Eight [Member] Risk Grade One To Eight [Member] Risk grades One To Eight [Member] Non Accrual Loans [Member] Non Accrual Loans [Member] Non-Accrual Loans [Member] Net change in short-term borrowings Increase (Decrease) in Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Net Unrecognized Stock-Based Compensation Expense Share-Based Payment Arrangement, Nonvested Award, Cost [Table Text Block] Entity Central Index Key Entity Central Index Key Approximate credit exposure related to swaps with bank customers Credit Derivative, Maximum Exposure, Undiscounted PEO Name PEO Name Revenues from (expenses to) external customers Revenues 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] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Frost Bank [Member] Frost Bank [Member] Frost Bank [Member] Weighted Average Risk Grades for All Commercial Loans by Class Financing Receivable Credit Quality Indicators [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Cullen/Frost [Member] Cullen Frost [Member] Cullen Frost [Member] Non-interest-bearing demand deposits Non-interest-bearing public funds deposits Noninterest-Bearing Deposit Liabilities Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Notional Amounts and Estimated Fair Values of Interest Rate Derivative Contracts Outstanding Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Class of Stock [Domain] Class of Stock [Domain] Non-vested stock units Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount U.S. federal statutory income tax rate, percent Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Subsequent Event Type [Axis] Subsequent Event Type [Axis] Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, Tax Expense (Benefit) Other Comprehensive Income (Loss) Transfers from Available For Sale To Held To Maturity Securities, Tax Tax Other Comprehensive Income (Loss) Transfers from Available For Sale To Held To Maturity Securities, Tax Carrying value before allocations Financing Receivable, Excluding Accrued Interest, Impaired, Recorded Investment Financing Receivable, Excluding Accrued Interest, Impaired, Recorded Investment Statement of Financial Position Location, Balance [Axis] Statement of Financial Position Location, Balance [Axis] Vesting [Domain] Vesting [Domain] Nature of Operations Nature Of Operations Policy [Policy Text Block] Nature of Operations Policy [Text Block] Q-factor adjustments [Member] Q-factor adjustments [Member] Q-factor adjustments [Member] 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] Entity Address, Address Line One Entity Address, Address Line One AOCI Attributable to Parent [Member] AOCI Attributable to Parent [Member] Net Amount Recognized, Repurchase agreements, Financial liabilities Assets Sold under Agreements to Repurchase, Repurchase Liability Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Loans and Leases Receivable Disclosure [Line Items] Loans and Leases Receivable Disclosure [Line Items] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Industry Sector [Axis] Industry Sector [Axis] Maximum dividends available without prior regulatory approval Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval Customer Counterparties [Member] Customer Counterparties [Member] Customer Counterparties [Member] Fair Value as of Grant Date Award Grant Date Fair Value Undistributed earnings allocated to common stock Undistributed Earnings, Basic Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Employee benefits Employee Benefits and Share-Based Compensation Salaries and wages Labor and Related Expense Commercial and Industrial Total Energy Loans [Member] Commercial and Industrial Total Energy Loans [Member] Commercial and Industrial Total Energy Loans [Member] Dilutive effect of stock compensation Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Granted, Number of Units Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Total Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Forfeited/expired, Number of Shares/Units Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Document Quarterly Report Document Quarterly Report Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Bank Overdrafts Bank Overdrafts [Member] Short-term lease expense Short term operating lease rent expense Short term operating lease rent expense Deposits Deposit Liabilities Disclosures [Text Block] Financial Assets and Financial Liabilities Measured at Fair Value on Recurring Basis Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Financial Instrument Performance Status [Axis] Financial Instrument Performance Status [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Non-Accrual Loans, Segregated by Class of Loans Financing Receivable, Nonaccrual [Table Text Block] Maximum number of quarterly periods by which the corporation has the right to defer interest payments on junior subordinated deferrable interest debentures Maximum number of quarterly periods by which the corporation has the right to defer interest payments on junior subordinated deferrable interest debentures Maximum number of quarterly periods by which the corporation has the right to defer interest payments on junior subordinated deferrable interest debentures Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Other Non-Interest Income [Member] Other Income [Member] Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document And Entity Information Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Earnings on life insurance policies Other Noncash Income Commodity swaps and options [Member] Commodity Swaps And Options [Member] Commodity Swaps And Options [Member] Remaining contractual maturity of the agreements overnight and continuous Remaining contractual maturity of the agreements overnight and continuous Remaining contractual maturity of the agreements overnight and continuous Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit) Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit), before tax amount Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Non-PEO NEO Non-PEO NEO [Member] Debt Securities, Available-for-sale, Allowance for Credit Loss Debt Securities, Available-for-Sale, Allowance for Credit Loss Position [Domain] Position [Domain] Preferred stock dividend rate percentage Preferred Stock, Dividend Rate, Percentage Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Forward Contracts – Liability Notional Amount Derivative Liability, Notional Amount Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Award Type [Domain] Award Type [Domain] Moody's, Aaa Rating Moody's, Aaa Rating [Member] Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required Plus Capital Conservation Buffer, Ratio Common Equity Tier One Capital Required For Capital Adequacy Minimum Capital Required Plus Capital Conservation Buffer, Ratio Common Equity Tier One Capital Required For Capital Adequacy Minimum Capital Required Plus Capital Conservation Buffer, Ratio Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Compensation Amount Outstanding Recovery Compensation Amount Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Capital Amount Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Foreign Currency Derivative Contracts [Member] Foreign Exchange Contract [Member] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Estimated Fair Value [Member] Estimate of Fair Value Measurement [Member] Customer counterparties Loan/lease interest rate caps liabilities [Member] Customer Counterparties Loan Lease Interest Rate Caps Liabilities [Member] Customer Counterparties Loan Lease Interest Rate Caps Liabilities [Member] Schedule of Investments [Line Items] Schedule of Investments [Line Items] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Net Amount Recognized, Derivatives, Financial Assets Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral Loan/lease interest rate swaps and caps [Member] Interest Rate Contracts [Member] Interest Rate Contracts [Member] Available for Sale, Due after one year through five years, Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single 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Collateral, Obligation to Return Security Not Offset Accounting Policies [Abstract] Accounting Policies [Abstract] Net Amount Recognized, Total Financial Assets Financial Assets Derivatives And Repurchase Agreements Net Financial Assets Derivatives And repurchase Agreements Net Weighted Average Risk Grade For Loans Weighted Average Risk Grade Weighted Average Risk Grade For Loans Weighted Average Risk Grade for Loans Treasury Stock, Common Treasury Stock, Common [Member] Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year Financing Receivable, Non-Accrual Loans, Segregated by Class of Loan and Year of Origination Financing Receivable, Non-Accrual Loans, Segregated by Class of Loan and Year of Origination [Table Text Block] [Table Text Block] for Financing Receivable, Non-Accrual Loans, Segregated by Class of Loan and Year of Origination [Table] Pay vs 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[Member] NEW YORK STOCK EXCHANGE, INC. 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dollar denominated loans and commitments to borrowers in Mexico U.S. dollar denominated loans and commitments to borrowers in Mexico U.S. dollar denominated loans and commitments to borrowers in Mexico Statement [Table] Statement [Table] Series B Preferred Stock Equivalent Depositary Shares Member Series B Preferred Stock Equivalent Depositary Shares Member [Member] Series B Preferred Stock Equivalent Depositary Shares Member Deferred tax expense (benefit) Deferred income tax expense (benefit) Deferred Income Tax Expense (Benefit) Adjustments to reconcile net income to net cash from operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] External Credit Rating, Moody's [Domain] External Credit Rating, Moody's [Domain] Change in net unrealized gain on securities transferred to held to maturity Securities available for sale and transferred securities, Change in net unrealized gain on securities transferred to held to maturity, 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Fair Value Specific Valuation Allowance Allocation Method Of Underlying Collateral [Table Text Block] Impaired Loans Remeasured And Reported At Fair Value Specific Valuation Allowance Allocation Method Of Underlying Collateral [Table Text Block] Discloses the impaired loans measured and reported at fair value through specific valuation allowance allocation method for allowance for loan losses based upon the fair value of the underlying collateral Text Block. Deposit Liabilities, Type Deposit Liabilities, Type [Table Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Scenario [Domain] Scenario [Domain] Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net Proceeds from sales of foreclosed assets Proceeds from Sale of Foreclosed Assets Change in net unrealized gain/loss on securities available for sale during the period Securities available for sale and transferred securities, Change in net unrealized gain/loss during the period, Before Tax Amount OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Interest Interest Paid, Including Capitalized Interest, Operating and Investing Activities Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Consolidated Entities [Axis] Consolidated Entities [Axis] Common stock, par value Common Stock, Par or Stated Value Per Share Non-hedging interest rate swaps – customer counterparties Non Hedging Interest Rate Swaps 2 Non-hedging interest rate swaps (2) Geographic Distribution [Axis] Geographic Distribution [Axis] Use of Estimates Use of Estimates, Policy [Policy Text Block] Cash dividend - Preferred Stock Dividends equivalent Per depositary Share Declared (approximately $0.28 per depository share YTD in both 2026 and 2025, respectively.) Preferred Stock Dividends equivalent Per depositary Share Declared Preferred Stock Dividends equivalent Per depositary Share Declared Total Capital to Risk-Weighted Assets, Actual, Capital Amount Banking Regulation, Total Capital, Actual Address Type [Domain] Address Type [Domain] Net occupancy Occupancy, Net Concentration of loans in a single industry in excess of ten percent Concentration of loans in a single industry in excess of ten percent Concentration of loans in a single industry in excess of ten percent Other counterparties Other Counterparties [Member] Other Counterparties [Member] Insider Trading Arrangements [Line Items] Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year Financial Asset, Not Past Due Financial Asset, Not Past Due [Member] Total liabilities Liabilities Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Ineffectiveness on Interest Rate Fair Value Hedges is Immaterial Fair Value Hedges, Net Financial instruments with off- balance-sheet risk Fair Value Disclosure, off-Balance-Sheet Risks, Amount, Liability Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Oil Commodity Derivative [Member] Oil Commodity Derivative [Member] Oil Commodity Derivative [Member] Net change in loans Payments for (Proceeds from) Loans and Leases Non-accrual Loans Year of Origination [Axis] Non-accrual Loans Year of Origination [Axis] Non-accrual Loans Year of Origination [Axis] Financial Instrument Performance Status [Domain] Financial Instrument Performance Status [Domain] Final years of the term of the notes Final years of the term of the notes Final years of the term of the notes Gross Amounts Not Offset Financial Instruments, Total Derivatives, Financial Liabilities Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset Federal funds purchased Interest Expense, Federal Funds Purchased Subordinated notes Interest Expense, Subordinated Notes and Debentures Counterparty Name [Axis] Counterparty Name [Axis] Securities held to maturity: Maturities, calls and principal repayments Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities Securities available for sale, at estimated fair value Debt Securities, Available-for-Sale Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member]