Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Statement, Equity Components Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Retained earnings Retained Earnings [Member] Accumulated other comprehensive income (loss) AOCI Attributable to Parent [Member] Treasury stock Treasury Stock [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning Balances (in shares) Shares, Outstanding Beginning Balances Stockholders' Equity Attributable to Parent New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification Net income Net Income (Loss) Attributable to Parent Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Cash dividends declared : Dividends [Abstract] Common stock at $0.23 per share and $0.67 per share in 2019 and $0.20 per share and $0.58 per share in 2018 Dividends, Common Stock, Cash Treasury Stock, Shares, Acquired Treasury Stock, Shares, Acquired Treasury Stock, Value, Acquired, Cost Method Treasury Stock, Value, Acquired, Cost Method Stock Issued During Period, Shares, Acquisitions Stock Issued During Period, Shares, Acquisitions Stock Issued During Period, Shares, New Issues Stock Issued During Period, Shares, New Issues Stock Issued During Period, Value, Acquisitions Stock Issued During Period, Value, Acquisitions Stock Options and Warrants Acquired And Converted Pursuant To Acquisition Stock Options and Warrants Acquired And Converted Pursuant To Acquisition Stock Options and Warrants Acquired And Converted Pursuant To Acquisition Stock Issued During Period, Shares, Other Stock Issued During Period, Shares, Other Adjustments to Additional Paid in Capital, Other Adjustments to Additional Paid in Capital, Other Exercise of stock options, net of shares purchased (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercise of stock options, net of shares purchased Stock Issued During Period, Value, Stock Options Exercised Restricted stock awards, net of forfeitures (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Restricted stock awards, net of forfeitures Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Share-based compensation expense APIC, Share-based Payment Arrangement, Increase for Cost Recognition Ending Balances (in shares) Ending Balances Fair Value Disclosures [Abstract] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Fair Value by Measurement Frequency Measurement Frequency [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Fair Value, Measurements, Nonrecurring Fair Value, Nonrecurring [Member] Fair Value, Hierarchy Fair Value Hierarchy and NAV [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value Measurements Using Level 1 Fair Value, Inputs, Level 1 [Member] Fair Value Measurements Using Level 2 Fair Value, Inputs, Level 2 [Member] Fair Value Measurements Using Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Assets Assets, Fair Value Disclosure [Abstract] Impaired loans Impaired Loans, Fair Value Disclosure Impaired Loans, Fair Value Disclosure OREO Other Real Estate Owned, Fair Value Disclosure Other Real Estate Owned, Fair Value Disclosure Cover page. Document Type Document Type Document Quarterly Report Document Quarterly Report Document Period End Date Document Period End Date Document Transition Report Document Transition Report Entity File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Listings [Table] Entity Listings [Table] Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] Exchange [Domain] Exchange [Domain] NASDAQ/NGS (GLOBAL SELECT MARKET) [Member] NASDAQ/NMS (GLOBAL MARKET) [Member] Entity Listings [Line Items] Entity Listings [Line Items] Title of 12(b) Security Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Lease, Cost [Abstract] Operating Lease, Cost Operating Lease, Cost Finance Lease, Right-of-Use Asset, Amortization Finance Lease, Right-of-Use Asset, Amortization Finance Lease, Interest Expense Finance Lease, Interest Expense Short-term Lease, Cost Short-term Lease, Cost Variable Lease, Cost Variable Lease, Cost Lease, Cost Lease, Cost Organization, Consolidation and Presentation of Financial Statements [Abstract] BASIS OF PRESENTATION Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Leases [Abstract] Leases Leases of Lessee Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Table] Commitments and Contingencies Disclosure [Table] Commitments and Contingencies Disclosure [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Maximum [Member] Maximum [Member] Minimum [Member] Minimum [Member] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Affordable housing investment [Member] Affordable housing investment [Member] Affordable housing investment [Member] Historic tax credit [Member] Historic tax credit [Member] Historic tax credit [Member] Fair Value, Off-balance Sheet Risks by Financial Instrument Financial Instrument [Axis] Fair Value, Off-balance Sheet Risks, Financial Instruments [Domain] Financial Instruments [Domain] Commitments to Extend Credit Commitments to Extend Credit [Member] Commitments and Contingencies Disclosure [Line Items] Commitments and Contingencies Disclosure [Line Items] Commitments and Contingencies Disclosure [Line Items] Reserves for unfunded commitments Reserves for unfunded commitments Reserves for unfunded commitments Commitments outstanding to extend credit Long-term Line of Credit Loans and Leases Receivable, Commitments, Fixed Rates Loans and Leases Receivable, Commitments, Fixed Rates Loans and Leases Receivable, Commitments, Variable Rates Loans and Leases Receivable, Commitments, Variable Rates Loan Commitments, Fixed Interest Rate Range, Minimum Loan Commitments, Fixed Interest Rate Range, Minimum Loan commitments with a fixed interest rate minimum interest rate range. Loan Commitments, Fixed Interest Rate Range, Maximum Loan Commitments, Fixed Interest Rate Range, Maximum Maximum interest rate range of loan commitments with fixed interest rates. Loan Commitments, Fixed Rate, Maturities, Minimum Loan Commitments, Fixed Rate, Maturities, Minimum The minimum maturity of fixed rate loan commitments. Loan Commitments, Fixed Rate, Maturities, Maximum Loan Commitments, Fixed Rate, Maturities, Maximum The maximum maturity of fixed rate loan commitments. Letters of credit issued to guarantee performance of a client to a third party Letters of Credit Outstanding, Amount Affordable Housing Program Obligation Affordable Housing Program Obligation Low-income housing tax credit Effective Income Tax Rate Reconciliation, Tax Credit, Amount Amortization Method Qualified Affordable Housing Project Investments, Amortization Amortization Method Qualified Affordable Housing Project Investments, Amortization Affordable housing contingent commitment Affordable housing contingent commitment Affordable housing contingent commitment Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Estimated Litigation Liability Estimated Litigation Liability Investments, Debt and Equity Securities [Abstract] Investments Classified by Contractual Maturity Date [Table] Investments Classified by Contractual Maturity Date [Table] Investments Classified by Contractual Maturity Date [Table] Investment Investment Type [Axis] Investments Investments [Domain] One Year or Less [Member] One Year or Less [Member] Represents contractual maturities of one year or less After One Year Through Five Years [Member] After One Year Through Five Years [Member] Represents contractual maturities after one year through five years After Five Years Through Ten Years [Member] After Five Years Through Ten Years [Member] Represents contractual maturities after five years through ten years After Ten Years [Member] After Ten Years [Member] Represents contractual maturities after ten years Residential Mortgage Backed Securities [Member] Residential Mortgage Backed Securities [Member] Commercial Mortgage Backed Securities [Member] Commercial Mortgage Backed Securities [Member] Collateralized Mortgage Backed Securities [Member] Collateralized Mortgage Backed Securities [Member] Asset-backed Securities [Member] Asset-backed Securities [Member] Investments Classified by Contractual Maturity Date [Line Items] Investments Classified by Contractual Maturity Date [Line Items] Investments Classified by Contractual Maturity Date [Line Items] Held-to-Maturity Amortized Cost Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] Amortized Cost Debt Securities, Held-to-maturity Held-to-Maturity Market Value Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] Debt Securities, Held-to-maturity, Fair Value Debt Securities, Held-to-maturity, Fair Value Available-for-Sale Amortized Cost Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract] Available-for-sale Securities, Amortized Cost Basis Available-for-sale Securities, Amortized Cost Basis Available-for-Sale Market Value Debt Securities, Available-for-sale [Abstract] Investment securities available-for-sale Available-for-sale Securities Statement of Financial Position [Abstract] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Commercial real estate Commercial Real Estate Portfolio Segment [Member] Construction real estate Construction Loans [Member] Commercial Commercial Portfolio Segment [Member] Lease financing Finance Leases Portfolio Segment [Member] Residential real estate Residential Portfolio Segment [Member] Home equity Home Equity Line of Credit [Member] Installment Consumer Portfolio Segment [Member] Credit card Credit Card Receivable [Member] Loans and Leases Receivable, Net of Deferred Income Loans and Leases Receivable, Net of Deferred Income ASSETS Assets [Abstract] Cash and due from banks Cash and Due from Banks Interest-bearing deposits with other banks Interest-bearing Deposits in Banks and Other Financial Institutions Investment securities available-for-sale, at fair value (amortized cost $2,789,151 at September 30, 2019 and $2,792,326 at December 31, 2018) Investment securities held-to-maturity (fair value $149,724 at September 30, 2019 and $424,118 at December 31, 2018) Other investments Other Investments Loans held for sale Loans Receivable Held-for-sale, Net, Not Part of Disposal Group Loans Loans and Leases Receivable, Net of Deferred Income [Abstract] Total loans and leases Loans and Leases Receivable, Allowance Loans and Leases Receivable, Allowance Net loans and leases Loans and Leases Receivable, Net Amount Premises and equipment Property, Plant and Equipment, Net Goodwill Goodwill Other Finite-Lived Intangible Assets, Gross Other Finite-Lived Intangible Assets, Gross Accrued interest and other assets Interest Receivable and Other Assets Total assets Assets LIABILITIES Liabilities [Abstract] Deposits Deposits [Abstract] Interest-bearing Interest-bearing Deposit Liabilities, Domestic Savings Deposits, Savings Deposits Time Time Deposits Total interest-bearing deposits Interest-bearing Deposit Liabilities Noninterest-bearing Noninterest-bearing Deposit Liabilities Total deposits Deposits Federal funds purchased and securities sold under agreements to repurchase Federal Funds Purchased and Securities Sold under Agreements to Repurchase FHLB short-term borrowings Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Twelve Months Total short-term borrowings Short-term Debt Long-term debt Long-term Debt Total borrowed funds Debt and Lease Obligation Accrued interest and other liabilities Other Liabilities Total liabilities Liabilities SHAREHOLDERS' EQUITY Stockholders' Equity Attributable to Parent [Abstract] Common stock - no par value Authorized - 160,000,000 shares Issued - 104,281,794 shares in 2018 and 68,730,731 shares in 2017 Common Stock, Value, Issued Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Treasury stock, at cost, 4,186,975 shares in 2019 and 6,387,508 shares in 2018 Treasury Stock, Value Total shareholders' equity Total liabilities and shareholders' equity Liabilities and Equity Statement of Comprehensive Income [Abstract] Other comprehensive (loss) income, net of tax Other Comprehensive Income (Loss), Net of Tax [Abstract] Unrealized gain (loss) on debt securities arising during the period Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax Change in retirement obligation Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Unrealized gain (loss) on derivatives Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Other comprehensive income (loss) Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Income Statement [Abstract] Interest income Interest and Dividend Income, Operating [Abstract] Loans, including fees Interest and Fee Income, Loans and Leases Investment securities Interest and Dividend Income, Securities, by Taxable Status [Abstract] Taxable Interest Income, Securities, Operating, Taxable Tax-exempt Interest Income, Securities, Operating, Tax Exempt Total interest on investment securities Interest and Dividend Income, Securities, Operating Other earning assets Other Interest and Dividend Income Total interest income Interest and Dividend Income, Operating Interest expense Interest Expense [Abstract] Deposits Interest Expense, Deposits Short-term borrowings Interest Expense, Short-term Borrowings Long-term borrowings Interest Expense, Long-term Debt Total interest expense Interest Expense Net interest income Interest Income (Expense), Net Provision for Loan and Lease Losses Provision for Loan and Lease Losses Net interest income after provision for loan and lease losses Interest Income (Expense), after Provision for Loan Loss Noninterest income Noninterest Income [Abstract] Service Charges on Deposit Accounts Service Charges on Deposit Accounts Service Charges on Deposit Accounts Trust and wealth management fees Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions Bankcard income Fees And Commissions-Bankcards Fees and commissions from credit cards. Not including interest on credit cards. Client derivative fees Derivative, Gain (Loss) on Derivative, Net Foreign exchange income Foreign exchange income Fees received from foreign exchange activities Net gain from sales of loans Gain (Loss) on Sales of Loans, Net Net gain (loss) on sales/transfers of investment securities Debt and Equity Securities, Gain (Loss) Other Noninterest Income, Other Operating Income Total noninterest income Noninterest Income Noninterest expenses Noninterest Expense [Abstract] Salaries and employee benefits Labor and Related Expense Net occupancy Occupancy, Net Furniture and equipment Equipment Expense Data processing Information Technology and Data Processing Marketing Marketing Expense Communication Communication Professional services Professional Fees State intangible tax Taxes, Other FDIC assessments Federal Deposit Insurance Corporation Premium Expense Intangible assets amortization Amortization of Intangible Assets Other Other Noninterest Expense Total noninterest expenses Noninterest Expense Income before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Net income Earnings per common share Earnings Per Share [Abstract] Basic Earnings Per Share, Basic Diluted Earnings Per Share, Diluted Cash dividends declared per share Common Stock, Dividends, Per Share, Declared Average common shares outstanding - basic Weighted Average Number of Shares Outstanding, Basic Average common shares outstanding - diluted Weighted Average Number of Shares Outstanding, Diluted Receivables [Abstract] Schedule of Impaired Financing Receivable [Table] Schedule of Impaired Financing Receivable [Table] Impaired Financing Receivables [Axis] Impaired Financing Receivables [Axis] Impaired Financing Receivables [Axis] Impaired Financing Receivables [Domain] Impaired Financing Receivables [Domain] Impaired Financing Receivables [Domain] Impaired Financing Receivables With Related Allowance [Member] Impaired Financing Receivables With Related Allowance [Member] Represents a subset of a class of financing receivables that have specific allowances related to the impaired receivables SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Loans with no related allowance recorded [member] Loans with no related allowance recorded [member] Represents a subset of a class of financing receivables that have no specific allowances related to the impaired receivables Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Financing Receivable, Impaired [Line Items] Financing Receivable, Impaired [Line Items] Financing Receivable, Nonaccrual Financing Receivable, Nonaccrual Current balance Impaired Financing Receivable, Recorded Investment Contractual Principal Balance Impaired Financing Receivable, Unpaid Principal Balance Related Allowance Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Average current balance Impaired Financing Receivable, Average Recorded Investment Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method Interest income recognized Impaired Financing Receivable, Interest Income, Accrual Method Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative [Table] Derivative [Table] Derivatives, Fair Value, by Balance Sheet Location Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Accrued interest and other assets Other Assets [Member] Accrued interest and other liabilities Other Liabilities [Member] Derivative Instruments, Gain (Loss) by Hedging Relationship Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Fair Value Hedges Fair Value Hedging [Member] Foreign Exchange [Member] Foreign Exchange [Member] Derivative Instrument Risk Derivative Instrument [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] Interest Rate Swap Interest Rate Swap [Member] Matched interest rate swaps Matched Interest Rate Swaps [Member] Matched Interest Rate Swaps Trading Activity [Axis] Trading Activity [Axis] Trading Activity, by Type [Domain] Trading Activity, by Type [Domain] Derivative Financial Instruments Receive Fixed Pay Variable Derivative Financial Instruments Receive Fixed Pay Variable Member Derivative Financial Instruments, Receive Fixed Pay Variable Member Derivative Financial Instruments Receive Variable Pay Fixed Derivative Financial Instruments Receive Variable Pay Fixed [Member] Derivative Financial Instruments, Receive Variable Pay Fixed Member Derivative [Line Items] Derivative [Line Items] Derivative, Notional Amount Derivative, Notional Amount Derivative Asset Derivative Asset Derivative Liability Derivative Liability Average Maturity (years) Derivative, Average Remaining Maturity Fair Value Derivative Assets (Liabilities), at Fair Value, Net Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table Text Block] Changes in Carrying Amount of Goodwill Schedule of Goodwill [Table Text Block] Commercial and Consumer Credit Exposure by Risk Attribute Financing Receivable Credit Quality Indicators [Table Text Block] Loan Delinquency, including Nonaccrual Loans Financing Receivable, Past Due [Table Text Block] Loans Restructured During Period Loans Restructured [Table Text Block] Loans Restructured [Table Text Block] Loans Restructured, Modifications Loans Restructuring, Modifications [Table Text Block] Loans Restructuring, Modifications [Table Text Block] Nonaccrual, Restructured and Impaired Loans Schedule of Financin Receivables Nonaccrual Restructured and Impaired Schedule of Financing Receivables, Nonaccrual, Restructured and Impaired Investment in Impaired Loans Impaired Financing Receivables [Table Text Block] Changes in Other Real Estate Owned Schedule of Other Real Estate Owned [Table Text Block] Schedule of Other Real Estate Owned Derivative Derivative [Member] Other Credit Derivatives [Member] Other Credit Derivatives [Member] Credit Risk Credit Risk [Member] Credit Risk Contract [Member] Credit Risk Contract [Member] Interest Rate Lock Commitments [Member] Interest Rate Lock Commitments [Member] Number of counterparties Number Of Derivative Counterparty Number Of Derivative Counterparty Derivative liabilities Credit Risk Derivative Liabilities, at Fair Value Credit Risk Derivative Liabilities, at Fair Value Credit Risk Derivative Assets, at Fair Value Credit Risk Derivative Assets, at Fair Value Debt Disclosure [Abstract] BORROWINGS Debt Disclosure [Text Block] INVESTMENTS Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Commercial Commercial Loan [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Financing Receivable, Troubled Debt Restructuring, Subsequent Default Financing Receivable, Troubled Debt Restructuring, Subsequent Default Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts Financing Recivable Modifications, Investment Recorded Financing Recivable Modifications, Investment Recorded Financing Recivable Modifications, Investment Recorded Restructured Loans, Portion Determined to be Uncollectible Restructured Loans, Portion Determined to be Uncollectible Restructured Loans, Portion Determined to be Uncollectible Purchased impaired loans Purchased impaired loans, carrying balance Carrying balance/book balance of purchased impaired loans accounting for under FASB ASC Topic 310-30. Restructured Loans, Nonaccrual Status Restructured Loans, Nonaccrual Status Restructured Loans, Nonaccrual Status Restructured Loans, Loan Relationships, Review Threshold Amount Minimum Restructured Loans, Loan Relationships, Review Threshold Amount Minimum Restructured Loans, Loan Relationships, Review Threshold Amount Minimum for commercial and other loans greater than $250,000 Write-downs Real Estate Owned, Transfer from Real Estate Owned Real Estate Acquired Through Foreclosure Real Estate Acquired Through Foreclosure Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY PARENTHETICALS [Abstract] CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY PARENTHETICALS [Abstract] Equity Components [Axis] Common Stock, Dividends, Per Share, Declared Retirement Benefits [Abstract] EMPLOYEE BENEFIT PLANS Pension and Other Postretirement Benefits Disclosure [Text Block] Schedule of Gain (Loss) on Securities [Table] Schedule of Gain (Loss) on Securities [Table] Debt Security Category [Axis] Debt Security Category [Axis] 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] Gain (Loss) on Securities [Line Items] Gain (Loss) on Securities [Line Items] Realized gain (loss) on debt securities transferred from HTM to AFS Realized gain (loss) on debt securities transferred from HTM to AFS Realized gain (loss) on debt securities transferred from HTM to AFS NumberOfSecuritiesInSecurityPortfolio NumberOfSecuritiesInSecurityPortfolio The total number of securities included in the investment securities portfolio. NumberOfSecuritiesInUnrealizedLossPosition NumberOfSecuritiesInUnrealizedLossPosition The total number of securities included in the investment securities portfolio that include net accumulated unrealized losses. Proceeds from Sale of Debt Securities, Available-for-sale Proceeds from Sale of Debt Securities, Available-for-sale Available-for-sale Securities, Gross Realized Gains Available-for-sale Securities, Gross Realized Gains Available-for-sale Securities, Gross Realized Losses Available-for-sale Securities, Gross Realized Losses Debt Securities, Held-to-maturity, Transfer, Amount Debt Securities, Held-to-maturity, Transfer, Amount Lease, Cost [Table Text Block] Lease, Cost [Table Text Block] Lessee, Operating Lease, Liability, Maturity [Table Text Block] Lessee, Operating Lease, Liability, Maturity [Table Text Block] Schedule of supplemental balance sheet information related to leases. [Table Text Block] Schedule of supplemental balance sheet information related to leases. [Table Text Block] Schedule of supplemental balance sheet information related to leases, including weighted average lease terms and weighted average discount rates. 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 Summary of Held-To-Maturity and Available-For-Sale Investment Securities Unrealized Gain (Loss) on Investments [Table Text Block] Summary of Investment Securities by Estimated Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Age of Gross Unrealized Losses and Associated Fair Value by Investment Category Schedule of Unrealized Loss on Investments [Table Text Block] Core deposits Core Deposits [Member] Customer lists Customer Lists [Member] Other Other Intangible Assets [Member] Intangible assets amortization method Finite-Lived Intangible Assets, Amortization Method Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Debt Instruments [Abstract] Collateralized Mortgage Obligations [Member] Collateralized Mortgage Obligations [Member] Securities Sold under Agreements to Repurchase Securities Sold under Agreements to Repurchase 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 Equity [Abstract] Related Tax Effects Allocated to Other Comprehensive Income and Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Other Accumulated Comprehensive income reclassified from AOCI Other Accumulated Comprehensive income reclassified from AOCI [Table Text Block] [Table Text Block] for Other Accumulated Comprehensive income reclassified from AOCI [Table] Notes to Financial Statements [Abstract] Notes to Financial Statements [Abstract] Other Contract-Mortgage Other Contract [Member] Lessee, Leases [Policy Text Block] Lessee, Leases [Policy Text Block] Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block] Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block] Basis of Presentation Policy Basis of Presentation [Policy Text Block] Basis of Presentation [Policy Text Block] Use of Estimates, Policy Use of Estimates, Policy [Policy Text Block] Loans and Leases Receivable, Past Due Status, Policy Loans and Leases Receivable, Past Due Status, Policy [Policy Text Block] Loans and Leases Receivable, Nonaccrual Loan and Lease Status, Policy Loans and Leases Receivable, Nonaccrual Loan and Lease Status, Policy [Policy Text Block] Loans and Leases Receivable, Troubled Debt Restructuring Policy Troubled Debt Restructuring [Policy Text Block] Impaired Financing Receivable, Policy Impaired Financing Receivable, Policy [Policy Text Block] Loans and Leases Receivable, Real Estate Acquired Through Foreclosure, Policy Financing Receivable, Real Estate Acquired Through Foreclosure [Policy Text Block] Loans and Leases Receivable, Allowance for Loan Losses Policy Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block] Goodwill and Intangible Assets, Goodwill, Policy Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Goodwill and Intangible Assets, Goodwill Impairment Policy Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block] Goodwill and Intangible Assets, Policy Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Derivatives, Methods of Accounting, Hedging Derivatives, Policy Derivatives, Methods of Accounting, Hedging Derivatives [Policy Text Block] Income Tax, Policy Income Tax, Policy [Policy Text Block] Commitments and Contingencies, Policy Commitments and Contingencies, Policy [Policy Text Block] Fair Value Measurement, Policy [Policy Text Block] Fair Value Measurement, Policy [Policy Text Block] Fair Value of Financial Instruments, Policy Fair Value of Financial Instruments, Policy [Policy Text Block] Loan Commitments, Policy [Policy Text Block] Loan Commitments, Policy [Policy Text Block] Investment Holdings [Table] Investment Holdings [Table] U.S. Treasuries US Treasury Securities [Member] Securities of U.S. government agencies and corporations US Government Corporations and Agencies Securities [Member] Obligations of state and other political subdivisions US States and Political Subdivisions Debt Securities [Member] Other securities Other Debt Obligations [Member] Investment Holdings [Line Items] Investment Holdings [Line Items] Total Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss Held-to-Maturity Market Value Total Available for Sale Securities Gross Unrealized Gain Accumulated In Investments Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Available for Sale Securities Gross Unrealized Loss Accumulated In Investments Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Amount Long-term Debt, Unclassified [Abstract] FHLB long-term advances Advances from Federal Home Loan Banks Subordinated debt Subordinated Debt Unamortized debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Finance Lease, Liability Finance Lease, Liability Capital loan with municipality Other Long-term Debt Total long-term debt Average Rate Average Rate [Abstract] Average Rate [Abstract] Weighted average rate on other long-term debt Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate Debt, Weighted Average Interest Rate Debt, Weighted Average Interest Rate Federal Home Loan Bank Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End Lessee, Finance Lease, Discount Rate Lessee, Finance Lease, Discount Rate Total long-term debt Long-term Debt, Weighted Average Interest Rate, at Point in Time Earnings Per Share Disclosure [Table] Earnings Per Share Disclosure [Table] Earnings Per Share Disclosure [Table] Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Antidilutive Warrants Warrant [Member] Antidilutive Stock Options Share-based Payment Arrangement, Option [Member] Earnings Per Share Disclosure [Line Items] Earnings Per Share Disclosure [Line Items] Earnings Per Share Disclosure [Line Items] Stock options and warrants with an exercise price greater than the average market price of the common shares not included in the computation of net income per diluted share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Investment Warrants, Exercise Price Warrants Exercise Price Warrants Exercise Price Estimated Fair Values of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Summary of Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis Fair Value Measurements, Nonrecurring [Table Text Block] Income Tax Disclosure [Abstract] Operating Lease, Right-of-Use Asset Operating Lease, Right-of-Use Asset Operating Lease, Liability Operating Lease, Liability Allowance for loans and leases losses, range of increase, minimum Allowance for loans and leases losses, range of increase, minimum Allowance for loans and leases losses minimum percent increase expected under CECL. Allowance for loans and leases losses, increase, maximum Allowance for loans and leases losses, increase, maximum Allowance for loans and leases losses maximum percent increase expected under CECL. Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year Lessee, Operating Lease, Liability, Payments, Due Year Two Lessee, Operating Lease, Liability, Payments, Due Year Three Lessee, Operating Lease, Liability, Payments, Due Year Four Lessee, Operating Lease, Liability, Payments, Due Year Five Lessee, Operating Lease, Liability, Payments, Due after Year Five Lessee, Operating Lease, Liability, Payments, Due Lessee, Operating Lease, Liability, Payments, Due Lessee, Operating Lease, Liability, Undiscounted Excess Amount Lessee, Operating Lease, Liability, Undiscounted Excess Amount Finance Lease, Liability, Payments, Remainder of Fiscal Year Finance Lease, Liability, Payments, Due Year Two Finance Lease, Liability, Payments, Due Year Two Finance Lease, Liability, Payments, Due Year Three Finance Lease, Liability, Payments, Due Year Three Finance Lease, Liability, Payments, Due Year Four Finance Lease, Liability, Payments, Due Year Four Finance Lease, Liability, Payments, Due Year Five Finance Lease, Liability, Payments, Due Year Five Finance Lease, Liability, Payments, Due after Year Five Finance Lease, Liability, Payments, Due after Year Five Lease liability payments remainder of fiscal year Lease liability payments remainder of fiscal year Lease liability payments remainder of fiscal year Lease Liability Payments Due Year Two Lease Liability Payments Due Year Two Lease Liability Payments Due Year Two Lease Liability Payments Due Year Three Lease Liability Payments Due Year Three Lease Liability Payments Due Year Three Lease Liability Payments Due Year Four Lease Liability Payments Due Year Four Lease Liability Payments Due Year Four Lease Liability Payments Due Year Five Lease Liability Payments Due Year Five Lease Liability Payments Due Year Five Lease Liability Payments Due After Year Five Lease Liability Payments Due After Year Five Lease Liability Payments Due After Year Five Lease Liability Payments Due Lease Liability Payments Due Lease Liability Payments Due Numerator for basic and diluted earnings per share -income available to common shareholders: Numerator for basic and diluted earnings per share income available to common shareholders Net Income (Loss) Available to Common Stockholders, Basic and Diluted [Abstract] Denominator for basic earnings per share - weighted average shares Effect of dilutive securities - Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] Employee stock awards Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Warrants Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants Denominator for diluted earnings per share - adjusted weighted average shares Fair Value, Assets and Liabilities Measured on Recurring Basis [Table] Fair Value, Assets and Liabilities Measured on Recurring Basis [Table] Fair Value, Assets and Liabilities Measured on Recurring Basis [Table] Interest Rate Contract [Member] Interest Rate Contract [Member] Fair Value, Measurements, Recurring Fair Value, Recurring [Member] Total Assets, Fair Value Disclosure Liabilities Liabilities, Fair Value Disclosure [Abstract] Total Financial and Nonfinancial Liabilities, Fair Value Disclosure ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Comprehensive Income (Loss) Note [Text Block] GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill and Intangible Assets Disclosure [Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts Measurement Basis [Axis] Fair Value, Disclosure Item Amounts [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Carrying value Reported Value Measurement [Member] Fair value Estimate of Fair Value Measurement [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Financial assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Cash and short-term investments Cash and Cash Equivalents, Fair Value Disclosure Investment securities held-to-maturity Loans held for sale Loans Held-for-sale, Fair Value Disclosure Loans and leases Loans Receivable, Fair Value Disclosure Interest Receivable Interest Receivable Financial liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Deposits Deposits, Fair Value Disclosure Short-term borrowings Short-term Debt, Fair Value Long-term debt Long-term Debt, Fair Value Interest Payable Interest Payable Statement of Cash Flows [Abstract] Operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Provision for loan and lease losses Provision for Loan, Lease, and Other Losses Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Stock-based compensation expense Share-based Payment Arrangement, Noncash Expense Pension expense (income) Pension Cost (Reversal of Cost) Net amortization (accretion) on investment securities Accretion (Amortization) of Discounts and Premiums, Investments Net (gain) loss on sales of investment securities Gain (Loss) on Sale of Investments Originations of loans held for sale Payments for Origination and Purchases of Loans Held-for-sale Net gains from sales of loans held for sale Proceeds from sales of loans held for sale Proceeds from Sale of Loans Held-for-sale Deferred income taxes Deferred Income Tax Expense (Benefit) Amortization of operating leases Operating Lease, Expense Payments for operating leases Operating Lease, Payments Decrease (increase) cash surrender value of life insurance Life Insurance, Corporate or Bank Owned, Change in Value Decrease (increase) in interest receivable Increase (Decrease) in Accrued Interest Receivable, Net (Decrease) increase in interest payable Increase (Decrease) in Interest Payable, Net Decrease (increase) in other assets Increase (Decrease) in Other Operating Assets (Decrease) increase in other liabilities Increase (Decrease) in Other Operating Liabilities Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Proceeds from sales of securities available-for-sale Proceeds from Sale of Available-for-sale Securities Proceeds from calls, paydowns and maturities of securities available-for-sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Purchases of securities available-for-sale Payments to Acquire Available-for-sale Securities Proceeds from calls, paydowns and maturities of securities held-to-maturity Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Payments to Acquire Held-to-maturity Securities Payments to Acquire Held-to-maturity Securities Payments to Acquire Other Investments Payments to Acquire Other Investments Net decrease (increase) in interest-bearing deposits with other banks Proceeds from (Payments for) in Interest-bearing Deposits in Banks Net decrease (increase) in loans and leases Payments for (Proceeds from) Loans and Leases Proceeds from disposal of other real estate owned Proceeds from Sale of Other Real Estate Purchases of premises and equipment Payments to Acquire Property, Plant, and Equipment Payments to Acquire Businesses, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired Net cash acquired (paid) from business combinations Cash Acquired from Acquisition Net cash (paid) received for branch divestitures Payments for (Proceeds from) Businesses and Interest in Affiliates Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Net (decrease) increase in total deposits Increase (Decrease) in Deposits Net (decrease) increase in short-term borrowings Proceeds from (Repayments of) Short-term Debt Payments of long-term debt Repayments of Long-term Debt Proceeds from FHLB borrowings Proceeds from FHLBank Borrowings, Financing Activities Cash dividends paid on common stock Payments of Ordinary Dividends, Common Stock Treasury stock purchase Payments for Repurchase of Common Stock Proceeds from exercise of stock options Proceeds from Stock Options Exercised Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Cash and due from banks: Cash and Cash Equivalents, Period Increase (Decrease) [Abstract] Change in cash and due from banks Cash and Cash Equivalents, Period Increase (Decrease) Cash and due from banks at beginning of period Cash and due from banks at end of period Supplemental schedule for investing activities Supplemental Cash Flow Information [Abstract] Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets, Net Of Purchase Consideration Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets, Net Of Purchase Consideration Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets, Net Of Purchase Consideration Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Goodwill Goodwill, Acquired During Period Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Discount Rate, Percent Operating Lease, Weighted Average Discount Rate, Percent Finance Lease, Weighted Average Discount Rate, Percent Finance Lease, Weighted Average Discount Rate, Percent Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Financial Asset, Period Past Due [Axis] Financial Asset, Period Past Due [Axis] Financial Asset, Period Past Due [Domain] Financial Asset, Period Past Due [Domain] Financial Asset, 30 to 59 Days Past Due [Member] Financial Asset, 30 to 59 Days Past Due [Member] Financial Asset, 60 to 89 Days Past Due [Member] Financial Asset, 60 to 89 Days Past Due [Member] Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due Financing Receivable, Past Due Current Financing Receivable, Not Past Due Loans and Leases Receivable, Gross Loans and Leases Receivable, Gross Total loans and leases > 90 days past due and still accruing Financing Receivable, 90 Days or More Past Due, Still Accruing Business Combinations [Abstract] Schedule of Recognized Identified Assets Acquired and Liabilities Assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Business Acquisition, Pro Forma Information, Nonrecurring Adjustments Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table Text Block] Goodwill [Roll Forward] Goodwill [Roll Forward] Balance at beginning of period Goodwill resulting from business combinations Balance at end of period Financing Receivable, Troubled Debt Restructuring [Table] Financing Receivable, Troubled Debt Restructuring [Table] Class of Financing Receivable Financing Receivable, Troubled Debt Restructuring [Line Items] Financing Receivable, Troubled Debt Restructuring [Line Items] Nonaccrual loans Accruing trouble debt restructurings Restructured Loans, Accrual Status Restructured Loans, Accrual Status Total impaired loans Restructured loans - nonaccrual status Interest income effect Loans and Leases Receivable Disclosure [Abstract] Gross amount of interest that would have been recorded under original terms Financing Receivable Impaired Interest Income Financing Receivable, Impaired, Interest Income that would have been recorded Interest included in income Loan and Lease Receivables, Impaired [Abstract] Nonaccrual loans Financing Receivable, Impaired, Interest Income Recorded on Nonaccrual Loans Financing Receivable, Impaired, Interest Income Recorded on Nonaccrual Loans Troubled debt restructurings Financing Receivable, Impaired, Interest Income Recorded on Restructured Loans Financing Receivable, Impaired, Interest Income Recorded on Restructured Loans Total interest included in income Net impact on interest income Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] 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] Unrealized gain (loss) on investment securities Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax Unrealized gain (loss) on derivatives Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Retirement obligation Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax Total Other Comprehensive Income (Loss), before Reclassifications, before Tax Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract] Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract] Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract] Realized gain (loss) on securities available-for-sale Debt Securities, Gain (Loss) Unrealized gain (loss) on derivatives Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax 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--includes amortization of prior service cost and recognized actuarial gains/losses. Total Accumulated Other Comprehensive Income, Reclassification, total, before tax Accumulated Other Comprehensive Income, Reclassification, total, before tax--includes gain or loss on derivatives, gains or losses on investment securities, and amortization of defined benefit pension plan items. Transactions Pre-tax Other Comprehensive Income (Loss), before Tax [Abstract] Unrealized gain (loss) on investment securities Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax, Net of Reclassification Adjustments Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax, Net of Reclassification Adjustments Unrealized gain (loss) on derivatives Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax Unfunded pension obligation Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Total Other Comprehensive Income (Loss), before Tax Transactions Tax-effect Other Comprehensive Income (Loss), Tax [Abstract] Unrealized gain (loss) on investment securities Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax Unrealized gain (loss) on derivatives Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Retirement obligation Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Total Other Comprehensive Income (Loss), Tax Transactions Net of tax Unrealized gain (loss) on investment securities Unrealized gain (loss) on derivatives Retirement obligation Total Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect Cumulative effect of new standard Tax Cuts and Jobs Act of 2017, reclassification from AOCI to retained earnings tax effect [Abstract] Tax cuts and jobs act of 2017, reclassification from AOCI to retained earnings tax effect [Abstract] Unrealized gain (loss) on investment securities Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax Unrealized gain (loss) on Derivatives OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociOnDerivativesDisproportionateTaxEffect Other Comprehensive Income Loss Reclassification Adjustment From AOCI On Derivatives Disproportionate Tax Effect Retirement obligation OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociPensionAndOtherPostretirementBenefitPlansDisproportionateTaxEffect Other Comprehensive Income Loss Reclassification Adjustment From AOCI Pension And Other Postretirement Benefit Plans Disproportionate Tax Effect Balances Net of tax Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Unrealized gain (loss) on investment securities AOCI, Debt Securities, Available-for-sale, Adjustment, after Tax Unrealized gain (loss) on cash flow hedges Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax Retirement obligation Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Total DERIVATIVES Derivative Instruments and Hedging Activities Disclosure [Text Block] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Bannockburn [Member] Bannockburn [Member] Bannockburn [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Business Acquisition, Number Of Shares Received by Acquiree Business Acquisition, Number Of Shares Received by Acquiree Business Acquisition, Number Of Shares Received by Acquiree for each share of acquiree's stock Business Combination, Consideration Transferred Business Combination, Consideration Transferred Payments for Merger Related Costs Payments for Merger Related Costs Loans Business Combination, Acquired Receivable, Fair Value Business Combination, Acquired Receivables, Gross Contractual Amount Business Combination, Acquired Receivables, Gross Contractual Amount Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Installment Consumer Loan [Member] Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Allowance for loan and lease losses: Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract] Allowance for Loan and Lease Losses, Write-offs Allowance for Loan and Lease Losses, Write-offs Allowance for Loan and Lease Loss, Recovery of Bad Debts Allowance for Loan and Lease Loss, Recovery of Bad Debts Allowance for Loan and Lease Losses Write-offs, Net Allowance for Loan and Lease Losses Write-offs, Net Ending allowance on loans individually evaluated for impairment Ending allowance on loans collectively evaluated for impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Loans and Leases: Ending balance of loans individually evaluated for impairment Financing Receivable, Individually Evaluated for Impairment Ending balance of loans collectively evaluated for impairment Financing Receivable, Collectively Evaluated for Impairment Impaired Financing Receivable, Related Allowance Impaired Financing Receivable, Related Allowance Recently Adopted and Issued Accounting Standards [Abstract] Recently Adopted and Issued Accounting Standards [Abstract] Recently Adopted and Issued Accounting Standards Disclosure [Text Block] Recently Adopted and Issued Accounting Standards Disclosure [Text Block] Recently Adopted and Issued Accounting Standards Disclosure ALLOWANCE FOR LOAN AND LEASE LOSSES Allowance for Credit Losses [Text Block] Private Placement [Member] Private Placement [Member] Subordinated Debt [Member] Subordinated Debt [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Federal Funds Purchased Federal Funds Purchased Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Long-term Debt Subordinated debt Subordinated debt, original issue Subordinated debt amount of original issue, excluding issue costs Subordinated Borrowing, Interest Rate Subordinated Borrowing, Interest Rate Debt Instrument Maturity Period Debt Instrument Maturity Period Debt Instrument Maturity Period DebtInstrumentMinimumCallablePeriod DebtInstrumentMinimumCallablePeriod Represents the period at par after which the debt can be called. Advances from Federal Home Loan Banks Revenue Recognition [Abstract] Interchange income Interchange income Gross Interchange income received on credit and debit cards. Credit card expense Credit card expense Gross expense related to credit cards. Summary of Derivative Financial Instruments and Balances Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Disclosure by Type of Financial Instrument Disclosure by Type of Financial Instrument [Table Text Block] Disclosure by Type of Financial Instrument [Table Text Block] Derivative Financial Instruments, Average Remaining Maturity and the Weighted-Average Interest Rates being Paid and Received Schedule of Derivative Instruments [Table Text Block] BUSINESS COMBINATIONS Business Combination Disclosure [Text Block] INCOME TAXES Income Tax Disclosure [Text Block] Business Acquisition, Pro Forma Revenue Business Acquisition, Pro Forma Revenue Business Acquisition, Pro Forma Net Income (Loss) Business Acquisition, Pro Forma Net Income (Loss) Business Acquisition, Pro Forma Earnings Per Share, Basic Business Acquisition, Pro Forma Earnings Per Share, Basic Business Acquisition, Pro Forma Earnings Per Share, Diluted Business Acquisition, Pro Forma Earnings Per Share, Diluted Other Accumulated Comprehensive income reclassified from AOCI [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Other Accumulated Comprehensive income reclassified from AOCI [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Defined Benefit Plan, Amortization of Gain (Loss) Defined Benefit Plan, Amortization of Gain (Loss) Other Comprehensive Income, Reclassification, Amortization of Defined Benefit Plans items, Pre-tax Total Gross amounts of recognized liabilities Derivative Liability, Fair Value, Gross Liability Derivative Liability, Fair Value, Gross Asset Derivative Liability, Fair Value, Gross Asset Derivative Liability, Fair Value, Amount Not Offset Against Collateral Derivative Liability, Fair Value, Amount Not Offset Against Collateral Derivative Asset, Fair Value, Amount Not Offset Against Collateral Derivative Asset, Fair Value, Amount Not Offset Against Collateral FAIR VALUE DISCLOSURES Fair Value Disclosures [Text Block] Investments, Unrealized Loss Position [Table] Investments, Unrealized Loss Position [Table] Investments, Unrealized Loss Position [Table] Investments, Unrealized Loss Position [Line Items] Investments, Unrealized Loss Position [Line Items] Investments, Unrealized Loss Position [Line Items] Less than 12 Months Fair Value Securities Continuous Unrealized Loss Position Less than Twelve Months Fair Value Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Less than 12 Months Unrealized Loss Securities Continuous Unrealized Loss Position Less than 12 Months Aggregate Losses Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses 12 Months or More Fair Value Securities Continuous Unrealized Loss Position Twelve Months or Longer Fair Value Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 12 Months or More Unrealized Loss Securities Continuous Unrealized Loss Position 12 Months or Longer Aggregate Losses Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Losses Total Fair Value Securities Continuous Unrealized Loss Position Fair Value Securities, Continuous Unrealized Loss Position, Fair Value Total Unrealized Loss Securities Continuous Unrealized Loss Position Aggregate Losses Securities, Continuous Unrealized Loss Position, Aggregate Losses Computation of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Finite-lived Intangible Assets Acquired Finite-lived Intangible Assets Acquired Estimated weighted average life (in years) Finite-Lived Intangible Asset, Useful Life Other Depreciation and Amortization Other Depreciation and Amortization Class of Financing Receivable [Domain] Extended Maturities Extended Maturity Extended Maturity Adjusted Interest Rates Adjusted Interest Rate Adjusted Interest Rate Combined Rate And Maturity Combined Rate And Maturity Combined Rate And Maturity Forebearance Agreements Forebearance Agreements Forebearance Agreements Other Financing Receivable Modifications, Other Financing Receivable Modifications, Other Total Loans Modified As Troubled Debt Restructurings During Period Loans Modified As Troubled Debt Restructurings During Period Restructured loans, Number of Loans Financing Receivable Modifications, Contracts, Number Financing Receivable Modifications, Contracts, Number Restructured loans, Restructured loans, Pre-Modification Loan Balance Financing Receivable Modifications, Pre Modification Investment Recorded Financing Receivable Modifications, Pre Modification Investment Recorded Restructured loans, Period End Balance Financing Receivable Modifications, Post Modification Investment Recorded Financing Receivable Modifications, Post Modification Investment Recorded Number of Restructured Loans Number of Restructured Loans Number of Restructured Loans Total restructured loans Financing Receivable, Troubled Debt Restructuring Restructured loans on accrual status Financing Receivable, Troubled Debt Restructuring, Commitment to Lend Financing Receivable, Troubled Debt Restructuring, Commitment to Lend Allowance for loan and lease losses lncluded in reserves for restructured loans Restructured Loans, Allowance for Loan and Lease Losses Included in Reserves Restructured Loans, Allowance for Loan and Lease Losses Included in Reserves Accruing TDRs performing in accordance with restructured terms for more than one year Restructured Loans, Accruing TDRs Performing in Accordance with Restructured Terms for More Than One Year Restructured Loans, Accruing TDRs Performing in Accordance with Restructured Terms for More Than One Year Restructured loans performance threshold (days) Restructured Loan Performance Threshold Restructured Loan Performance Threshold Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Commercial real estate Commercial Real Estate [Member] Total commercial loans Residential real estate Residential Real Estate [Member] Total consumer loans Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Pass Pass [Member] Special Mention Special Mention [Member] Substandard Substandard [Member] Doubtful Doubtful [Member] Performing Performing Financial Instruments [Member] Nonperforming Nonperforming Financial Instruments [Member] Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Cash consideration Payments to Acquire Businesses, Gross Stock consideration Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Warrant consideration Business Combination, Consideration Transferred, Other Options consideration Business Combination Consideration Transferred Stock Options Acquired By Acquirer Business Combination Consideration Transferred Stock Options Acquired By Acquirer Total purchase consideration Cash Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Investment securities available-for-sale Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Available for Sale Securities Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Available for Sale Securities Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Held to Maturity Securities Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Held to Maturity Securities Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Held to Maturity Securities Other investments Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Premises and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets Assets held for sale Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other Total assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Deposits Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Assumed Deposits Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Assumed Deposits Subordinated notes Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Subordinated Notes Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Subordinated Notes FHLB advances Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt Other borrowings BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumed, Short-term Debt BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumed, Short-term Debt Other liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Liabilities held for sale Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other Total liabilities assumed Net identifiable assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Operating cash flows from operating leases Operating cash flows from finance leases Finance Lease, Interest Payment on Liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Employee Benefit Plan Amounts Recognized in the Consolidated Balance Sheets and Consolidated Statements of Income Schedule of Net Benefit Costs [Table Text Block] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Balance at beginning of period Additions Real Estate Owned, Transfer to Real Estate Owned Disposals Balance at end of period Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Amortization of prior service cost Defined Benefit Plan, Amortization of Gain (Loss) Net periodic benefit cost (income) REVENUE RECOGNITION Revenue from Contract with Customer [Text Block] LOANS AND LEASES Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Effective tax rate Effective Income Tax Rate Reconciliation, Percent Unrecognized Tax Benefits that Would Impact Effective Tax Rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Common Stock, No Par Value Common Stock, No Par Value Common Stock, Shares Authorized Common Stock, Shares Authorized Common Stock, Shares, Issued Common Stock, Shares, Issued Treasury Stock, Shares Treasury Stock, Shares Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year Payment for Pension Benefits Payment for Pension Benefits Pension Cost (Reversal of Cost) EARNINGS PER COMMON SHARE Earnings Per Share [Text Block] Beginning balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Accretion (amortization) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Increase (decrease) in fair value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Period Increase (Decrease) Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) Ending balance Schedule Of Remaining Contractual Maturity Of Secured Borrowings And Class Of Collateral Pledged Under Repurchase Agreements Table [Table Text Block] Schedule Of Remaining Contractual Maturity Of Secured Borrowings And Class Of Collateral Pledged Under Repurchase Agreements Table [Table Text Block] Schedule Of Remaining Contractual Maturity Of Secured Borrowings And Class Of Collateral Pledged Under Repurchase Agreements Table [Table Text Block] Summary of Long-term Debt Schedule of Long-term Debt Instruments [Table Text Block] Allowance for Loan and Lease Losses by Classification Impaired Financing Receivable Recorded Investment and Allowance for Credit Losses [Text Block] Impaired Financing Receivable Recorded Investment and Allowance for Credit Losses