Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Schedule of Short-term Debt Schedule of Short-Term Debt [Table Text Block] Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Other liabilities Business Combination, Recognized Liability Assumed, Liability, Current Award Timing Predetermined Award Timing Predetermined [Flag] Valuation Allowance for Impairment of Recognized Servicing Assets, Balance Valuation Allowance for Impairment of Recognized Servicing Assets, Balance Amortization Method Qualified Affordable Housing Project Investments, Amortization Investment Program, Proportional Amortization Method, Applied, Amortization Expense Entity File Number Entity File Number Credit Risk Contract [Member] Credit Risk Contract [Member] Tabular List, Table Tabular List [Table Text Block] Total Other Comprehensive Income (Loss), Tax Noncash or Part Noncash Acquisition, Investments Acquired Noncash or Part Noncash Acquisition, Investments Acquired Payment for Pension Benefits Payment for Pension Benefits Estimated Fair Values of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Transactions Tax-effect Other Comprehensive Income (Loss), Tax [Abstract] Measurement Basis [Axis] Measurement Basis [Axis] Adjustment to Compensation: Adjustment to Compensation [Axis] Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] REVENUE RECOGNITION Revenue from Contract with Customer [Text Block] Westfield Bank Westfield Bank [Member] Westfield Bank Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery Fair Value, Option, Changes in Fair Value, Gain (Loss) Fair Value, Option, Changes in Fair Value, Gain (Loss) Summit Funding Group Summit Funding Group [Member] Summit Funding Group Restricted stock awards, net of forfeitures (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Adjustment to Compensation, Amount Adjustment to Compensation Amount Unamortized debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Decrease (increase) in other assets Increase (Decrease) in Other Operating Assets Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Antidilutive Stock Options Share-Based Payment Arrangement, Option [Member] Total Collateral Total Collateral [Member] Total of all Collateral types held. Income Taxes Paid Income Taxes Paid Lease financing Finance Leases Portfolio Segment [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities Antidilutive Securities [Axis] Installment Consumer Loan [Member] Common stock at $0.24 per share in 2025 and $0.25 per share in 2026 Dividends, Common Stock, Cash Total shareholders' equity Beginning Balances Ending Balances Stockholders' Equity Attributable to Parent Equity, Attributable to Parent Fair Value by Measurement Frequency Measurement Frequency [Axis] Summary of Investment Securities by Estimated Maturity Debt Securities, Available-for-Sale [Table] Other comprehensive (loss) income, net of tax Transactions Net of tax Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Common Stock, Shares Authorized Common Stock, Shares Authorized Financial assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Fair Value, Measurements, Recurring Fair Value, Recurring [Member] One Year or Less [Member] One Year or Less [Member] Represents contractual maturities of one year or less Cover [Abstract] Cover [Abstract] Cash and interest-bearing deposits with other banks Cash and Cash Equivalents, Fair Value Disclosure Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Additions Real Estate Owned, Transfer to Real Estate Owned Estimated weighted average life (in years) Finite-Lived Intangible Asset, Useful Life Amount Long-Term Debt, Unclassified [Abstract] Finite-Lived Intangible Assets, Net Finite-Lived Intangible Assets, Net Debt Securities, Available-for-Sale, Unrealized Loss Position Debt Securities, Available-for-Sale, Unrealized Loss Position Debt Securities, Available-for-Sale, Unrealized Loss Position Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Finance Receivable Percentage Of Class Of Loans And Leases Finance Receivable Percentage Of Class Of Loans And Leases Finance Receivable Percentage Of Class Of Loans And Leases Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block] Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block] Financing Receivable Allowance For Credit Losses Write Offs By Origination Year Including Revolving Financing Receivable Allowance For Credit Losses Write Offs By Origination Year Including Revolving Financing Receivable Allowance For Credit Losses Write Offs By Origination Year Including Revolving Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accrued interest and other assets Other Assets [Member] Business Combination, Bargain Purchase, Gain Recognized, Amount Business Combination, Bargain Purchase, Gain Recognized, Amount Business Combination, Bargain Purchase, Gain Recognized, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Investment securities Interest and Dividend Income, Securities, by Taxable Status [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Commitments and Contingencies Disclosure [Line Items] Commitments and Contingencies Disclosure [Line Items] Commitments and Contingencies Disclosure [Line Items] Amortization of Mortgage Servicing Rights (MSRs) Amortization of Mortgage Servicing Rights (MSRs) Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Total interest expense Interest Expense, Operating Premises and equipment Property, Plant, and Equipment, Excluding Lessor Asset under Operating Lease, after Accumulated Depreciation Other Accumulated Comprehensive income reclassified from AOCI [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Other Receivables Other Receivables Maximum Length of Time Hedged in Cash Flow Hedge Maximum Length of Time Hedged in Cash Flow Hedge Finance Lease, Interest Expense Finance Lease, Interest Expense Document Fiscal Period Focus Document Fiscal Period Focus Financing Receivable Restructured Loans Not Considered TDRs Weighted Average Interest Rate Reduction Financing Receivable Restructured Loans Not Considered TDRs Weighted Average Interest Rate Reduction Financing Receivable Restructured Loans Not Considered TDRs Weighted Average Interest Rate Reduction Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Award Timing Method Award Timing Method [Text Block] Financing Receivable Allowance For Credit Losses Write Offs in Five or More Years Before Latest Fiscal Year Financing Receivable Allowance For Credit Losses Write Offs in Five or More Years Before Latest Fiscal Year Financing Receivable Allowance For Credit Losses Write Offs in Five or More Years Before Latest Fiscal Year Award Type Award Type [Axis] Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Four Sales-Type and Direct Financing Leases, Payment to be Received, Year Three Hedging Relationship [Domain] Hedging Relationship [Domain] Trading Symbol Trading Symbol Lessee, Operating Lease, Liability, to be Paid, Year Four Lessee, Operating Lease, Liability, to be Paid, Year Four Earnings Per Share Disclosure [Table] Earnings Per Share Disclosure [Table] Earnings Per Share Disclosure [Table] Tax-exempt Interest Income, Securities, Operating, Tax Exempt NumberOfSecuritiesInSecurityPortfolio NumberOfSecuritiesInSecurityPortfolio The total number of securities included in the investment securities portfolio. Long-term borrowings Interest Expense, Long-Term Debt Entity Address, City or Town Entity Address, City or Town Short-term Debt, Type [Domain] Short-Term Debt, Type [Domain] Federal Home Loan Bank Stock and Federal Reserve Bank Stock Federal Home Loan Bank Stock and Federal Reserve Bank Stock Class of Financing Receivable [Axis] Class of Financing Receivable Class of Financing Receivable [Axis] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Net (decrease) increase in short-term borrowings Proceeds from (Repayments of) Short-Term Debt Net change in operating leases Net change in operating leases Net change in operating leases Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Credit Loss, Financial Instrument Credit Loss, Financial Instrument [Policy Text Block] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Business Combination, Consideration Transferred Total purchase consideration Business Combination, Consideration Transferred Short-term borrowings Interest Expense, Short-Term Borrowings Loans and Leases Receivable, Commitments, Fixed Rates Loans and Leases Receivable, Commitments, Fixed Rates Entity Emerging Growth Company Entity Emerging Growth Company Finance Lease, Weighted Average Remaining Lease Term Finance Lease, Weighted Average Remaining Lease Term Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 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] Client derivative fees Derivative, Gain (Loss) on Derivative, Net Total noninterest income Noninterest Income Finance Lease, Liability, Undiscounted Excess Amount Finance Lease, Liability, Undiscounted Excess Amount Lessor, Operating Lease, Payment to be Received, Remainder of Fiscal Year Lessor, Operating Lease, Payment to be Received, Remainder of Fiscal Year Net gains from sales of loans Net gains from sales of loans held for sale Gain (Loss) on Sales of Loans, Net Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss LOANS AND LEASES Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Noninterest expenses Noninterest Expense [Abstract] Cash and due from banks Cash and Due from Banks Affordable Housing Tax Credits and Other Tax Benefits, Amount Investment Program, Proportional Amortization Method, Elected, Income Tax Credit and Other Income Tax Benefit, before Amortization Expense Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Financial Asset Acquired and No Credit Deterioration Financial Asset Acquired and No Credit Deterioration [Member] 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] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Total interest on investment securities Interest and Dividend Income, Securities, Operating Income tax expense Income Tax Expense (Benefit) Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Basis Spread on Variable Rate Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Other Assets Other Assets Beginning balance Ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Fair Value Hierarchy and NAV [Axis] Fair Value, Hierarchy Fair Value Hierarchy and NAV [Axis] Derivative Instruments, Gain (Loss) by Hedging Relationship Hedging Relationship [Axis] Unrealized gain (loss) on investment securities AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price Loan Commitments, Fixed Rate, Maturities, Maximum Loan Commitments, Fixed Rate, Maturities, Maximum The maximum maturity of fixed rate loan commitments. Net Investment in Lease, before Allowance for Credit Loss, Total Net Investment in Lease, before Allowance for Credit Loss 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] Goodwill Goodwill, Acquired During Period Payments to Acquire Businesses, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired 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] Renewable Energy Program Renewable Energy Program [Member] Commitments and Contingencies, Policy Commitments and Contingencies, Policy [Policy Text Block] Other Noninterest Income, Other Operating Income Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Proceeds from Sale of Debt Securities, Available-for-sale Proceeds from Sale of Debt Securities, Available-for-Sale Disposals Proceeds from Sale of Other Real Estate Business Combination, Recognized Asset Acquired, Other Asset, Current Business Combination, Recognized Asset Acquired, Other Asset, Current Net interest income Interest Income (Expense), Operating Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] New Markets Tax Credit New Markets Tax Credit [Member] New Markets Tax Credit Finance Lease, Liability, to be Paid, Year Four Finance Lease, Liability, to be Paid, Year Four Gross amounts of recognized liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset Available-for-Sale Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Rolling Maturity [Abstract] Statement, Equity Components Equity Components [Axis] Equity Components [Axis] 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 Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Commercial real estate Commercial Real Estate [Member] Entity Address, State or Province Entity Address, State or Province Finance Lease, Principal Payments Finance Lease, Principal Payments Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, after Year Five Sales-Type and Direct Financing Leases, Payment to be Received, after Year Five Substandard Substandard [Member] Total interest income Interest and Dividend Income, Operating Financial Asset, Period Past Due [Domain] Financial Asset, Aging [Domain] Special Mention Special Mention [Member] Servicing Asset Servicing Asset Loans and leases Loans Receivable, Fair Value Disclosure Individual: Individual [Axis] Financing Receivable, Modifications, Policy Financing Receivable, Modifications, Policy [Policy Text Block] Financing Receivable, Modifications, Policy Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Cash dividends paid on common stock Payments of Ordinary Dividends, Common Stock Financing Receivable, Modified, Past Due Financing Receivable, Modified, Past Due [Table Text Block] Principal Forgiveness Principal Forgiveness [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Business Combinations, Deposits Business Combinations, Deposits Business Combinations, Deposits Other Depreciation and Amortization Other Depreciation and Amortization Payments of long-term debt Repayments of Long-Term Debt Entity Interactive Data Current Entity Interactive Data Current Financing Receivable, Troubled Debt Restructuring [Line Items] Financing Receivable, Modified [Line Items] Home equity Home Equity Line of Credit [Member] Foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Interest income Interest and Dividend Income, Operating [Abstract] Total noninterest expenses Noninterest Expense Finite-Lived Intangible Assets, Remaining Amortization Period Finite-Lived Intangible Assets, Remaining Amortization Period Payment Delay Payment Deferral [Member] ALLOWANCE FOR CREDIT LOSSES Allowance for Credit Losses [Text Block] Deposits Interest Expense, Deposits Noninterest income Noninterest Income [Abstract] Finance Lease, Liability, to be Paid, Year Two Finance Lease, Liability, to be Paid, Year Two Operating Leases Maturity (Table Text Block) Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block] Goodwill and Intangible Assets, Goodwill, Policy Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract] Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract] Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract] Entity Central Index Key Entity Central Index Key PEO Name PEO Name Foreign currency translation Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Bannockburn [Member] Bannockburn [Member] Bannockburn [Member] 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] Supplemental schedule for investing activities Supplemental Cash Flow Elements [Abstract] Financial Receivable Credit Quality Indicators Financing Receivable Credit Quality Indicators [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Qualified Affordable Housing Project Investments, Commitment Investment Program, Proportional Amortization Method, Elected, Commitment Noninterest-bearing Noninterest-Bearing Deposit Liabilities Summary of Derivative Financial Instruments and Balances Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Exercise Price Award Exercise Price Principal Amount of Commercial and Commercial Real Estate Loans Principal Amount of Commercial and Commercial Real Estate Loans Principal Amount of Commercial and Commercial Real Estate Loans Entity Filer Category Entity Filer Category Common Stock, No Par Value Common Stock, No Par Value Derivatives, Fair Value, by Balance Sheet Location Statement of Financial Position Location, Balance [Axis] Real Estate Acquired Through Foreclosure Balance at beginning of period Balance at end of period Real Estate Acquired Through Foreclosure Financing Receivable, before Allowance for Credit Loss Financing Receivable, before Allowance for Credit Loss Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Gross 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 Accumulated other comprehensive income (loss) AOCI Attributable to Parent [Member] Investments Investments [Domain] Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] DERIVATIVES Derivative Instruments and Hedging Activities Disclosure [Text Block] Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Amortization of prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Accrued interest and other liabilities Other Liabilities [Member] us-gaap_LoansAndLeasesReceivablePastDueStatusPolicy us-gaap_LoansAndLeasesReceivablePastDueStatusPolicy [Policy Text Block] us-gaap_LoansAndLeasesReceivablePastDueStatusPolicy Fair Value as of Grant Date Award Grant Date Fair Value 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 Fair Value, Inputs, Level 1, 2 and 3 Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Summary of Long-term Debt Schedule of Long-Term Debt Instruments [Table Text Block] Salaries and employee benefits Labor and Related Expense Reserves for unfunded commitments Reserves for unfunded commitments Reserves for unfunded commitments Employee stock awards Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Debt Securities, Available-for-Sale, Realized Gain (Loss), Number Debt Securities, Available-for-Sale, Realized Gain (Loss), Number Debt Securities, Available-for-Sale, Realized Gain (Loss), Number Entity Listings [Line Items] Entity Listings [Line Items] 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 Long-term debt Long-Term Debt, Fair Value Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Sales-type and Direct Financing Leases, Lease Receivable, Maturity Sales-Type and Direct Financing Leases, Payment to be Received, Maturity [Table Text Block] Financing Receivable, Nonaccrual Financing Receivable, Nonaccrual [Table Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Lessee, Operating Lease, Liability, to be Paid, Year Two Lessee, Operating Lease, Liability, to be Paid, Year Two Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Accounting Standards Update and Change in Accounting Principle [Abstract] Accounting Standards Update and Change in Accounting Principle [Abstract] Investment Investment Type [Axis] Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Derivative Asset, Fair Value of Collateral Derivative Asset, Fair Value of Collateral Cash consideration Payments to Acquire Businesses, Gross Non-PEO NEO Non-PEO NEO [Member] Letters of credit issued to guarantee performance of a client to a third party Letters of Credit Outstanding, Amount Components of lease investments Sales-Type and Direct Financing Leases, Payment to be Received, Fiscal Year Maturity [Abstract] Sales-type Lease, Unguaranteed Residual Asset Sales-type Lease, Unguaranteed Residual Asset Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Other Other Intangible Assets [Member] Land Land [Member] Available for Sale Securities Gross Unrealized Gain Accumulated In Investments Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Disclosure by Type of Financial Instrument Offsetting Assets [Table Text Block] All Award Types Award Type [Domain] Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax Lessee, Operating Lease, Liability, to be Paid, Year One Lessee, Operating Lease, Liability, to be Paid, Year One Equity Awards Adjustments Equity Awards Adjustments [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] After One Year Through Five Years [Member] After One Year Through Five Years [Member] Represents contractual maturities after one year through five years Compensation Amount Outstanding Recovery Compensation Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair value Estimate of Fair Value Measurement [Member] Spot foreign exchange income Spot foreign exchange income Foreign exchange income on spot transactions Performing Performing Financial Instruments [Member] Investment Holdings [Line Items] Schedule of Investments [Line Items] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral Finance Lease, Liability, to be Paid, Remainder of Fiscal Year Finance Lease, Liability, to be Paid, Remainder of Fiscal Year Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Financing Receivable Allowance For Credit Losses Write Offs By Origination Year Financing Receivable Allowance For Credit Losses Write Offs By Origination Year Financing Receivable Allowance For Credit Losses Write Offs By Origination Year Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset Credit card expense Credit card expense Gross expense related to credit cards. Amortization Method Qualified Affordable Housing Project Investments Investment, Proportional Amortization Method, Elected, Amount Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Financial Instruments [Domain] Financial Instruments [Domain] Financial Instruments [Domain] Balances Net of tax Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax NASDAQ/NGS (GLOBAL SELECT MARKET) [Member] NASDAQ/NMS (GLOBAL MARKET) [Member] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY PARENTHETICALS [Abstract] CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY PARENTHETICALS [Abstract] CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY PARENTHETICALS [Abstract] Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Five Sales-Type and Direct Financing Leases, Payment to be Received, Year Four Net interest income after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Carrying Value of Securities Sold under Repurchase Agreements and Deposits Received for Securities Loaned Carrying Value of Securities Sold under Repurchase Agreements and Deposits Received for Securities Loaned Goodwill Goodwill, Measurement Period Adjustment Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax Fair Value Measurement [Domain] Fair Value Measurement [Domain] BORROWINGS Debt Disclosure [Text Block] Net (gain) loss on investment securities Gain (Loss) on Sale of Investments Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Payments for operating leases Operating cash flows from operating leases Operating Lease, Payments Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Total Other Comprehensive Income (Loss), before Tax Collateral Held [Domain] Collateral Held [Domain] Goodwill [Roll Forward] Goodwill [Roll Forward] > 90 days past due and still accruing Financing Receivable, 90 Days or More Past Due, Still Accruing COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Fair Value Derivative Assets (Liabilities), at Fair Value, Net Average common shares outstanding - diluted Denominator for diluted earnings per share - adjusted weighted average shares Weighted Average Number of Shares Outstanding, Diluted Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Derivative [Table] Derivative [Table] Investment Program, Proportional Amortization Method, Elected, Equity Method Investment, Income (Loss) from Tax Credit Investment Investment Program, Proportional Amortization Method, Elected, Equity Method Investment, Income (Loss) from Tax Credit Investment Depreciation, Lessor Asset under Operating Lease Depreciation, Lessor Asset under Operating Lease Home Equity Loan Home Equity Loan [Member] Proceeds from Life Insurance Policy Proceeds from Life Insurance Policy Entity Small Business Entity Small Business Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Held-to-Maturity Amortized Cost Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity [Abstract] Commitments and Contingencies Disclosure [Table] Commitments and Contingencies Disclosure [Table] Commitments and Contingencies Disclosure [Table] Average Maturity (years) Derivative, Average Remaining Maturity Document Transition Report Document Transition Report Summary of Investment Holdings [Line Items] Summary of Investment Holdings [Line Items] Long-term Debt [Member] Long-Term Debt [Member] Finance Lease, Liability, to be Paid Finance Lease, Liability, to be Paid Underlying Securities Award Underlying Securities Amount Total Other Comprehensive Income (Loss), before Reclassifications, before Tax Debt Securities, Available-for-sale, Realized Gain Debt Securities, Available-for-Sale, Realized Gain Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date Construction Construction [Member] INCOME TAXES Income Tax Disclosure [Text Block] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Investments, Unrealized Loss Position [Line Items] Investments, Unrealized Loss Position [Line Items] Investments, Unrealized Loss Position [Line Items] Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Schedule of supplemental cash flow information related to leases [Table Text Block] Schedule of supplemental cash flow information related to leases [Table Text Block] Schedule of supplemental cash flow information related to leases Document Type Document Type Fair Value Measurements Using Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] EARNINGS PER COMMON SHARE Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Other Real Estate, Period Increase (Decrease) Other Real Estate, Period Increase (Decrease) Variable Lease, Cost Variable Lease, Cost Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount Sales-type and Direct Financing Leases, Lease Receivable, Undiscounted Excess Amount Financing Receivable Allowance For Credit Losses Write Offs Four Years Before Latest Fiscal Year Financing Receivable Allowance For Credit Losses Write Offs Four Years Before Latest Fiscal Year Financing Receivable Allowance For Credit Losses Write Offs Four Years Before Latest Fiscal Year Proceeds from sales of loans held for sale Proceeds from Sale, Loan, Held-for-Sale Retirement obligation Other Comprehensive Income, Reclassification, Amortization of Defined Benefit Plans items, Pre-tax Other Comprehensive Income, Reclassification, Amortization of Defined Benefit Plans items, Pre-tax Other Comprehensive Income, Reclassification, Amortization of Defined Benefit Plans items, Pre-tax--includes amortization of prior service cost and recognized actuarial gains/losses. 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