Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative [Table] Derivative [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Interest rate swaps Interest Rate Swap [Member] Reverse interest rate swaps Reverse Interest Rate Swaps [Member] Represents information pertaining to the reverse interest rate swaps which can be used to synthetically convert fixed rate debt to floating. Risk participation agreements with dealer banks Risk Participation Agreements [Member] Represents the information pertaining to risk participation agreements with dealer banks. Forward sale commitments Forward Commitments [Member] Represents the forward commitments that are free-standing derivatives which are carried at fair value with changes recorded in the mortgage banking component of noninterest income in the entity's consolidated statements of income. Commitments to lend Commitments to Extend Credit [Member] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Economic hedges Economic Hedging [Member] Represents information pertaining to derivatives that are not designated as accounting hedges but are being used as economic hedges. Non-hedging derivatives Nonhedging [Member] Represents information pertaining to derivatives that are not used for hedging purposes and thus are not designated as accounting hedges. Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Industrial revenue bond Industrial Revenue Bond [Member] Represents information pertaining to the industrial revenue bond, a financing instrument issued by designated local industrial development boards (IDB's) or other issuers authorized by state law. Loans with commercial loan customers Commercial Paper [Member] Derivative [Line Items] Derivative [Line Items] Unrealized (loss)/gain recognized in other non-interest income Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments (Unfavorable)/Favorable change in credit valuation adjustment recognized in other non-interest income Derivative Instruments Favorable Changes in Credit Valuation Adjustment Recognized in Other Non Interest Income The favorable changes in credit valuation adjustments on derivative instruments that were recognized in other non-interest income during the current period. Realized gain in discontinued operations Gain (Loss) on Sale of Derivatives Business Combinations [Abstract] PENDING ACQUISITION Mergers, Acquisitions and Dispositions Disclosures [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Stock options Employee Stock Option [Member] Non-Vested Stock Awards Outstanding Restricted Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Exercise of stock options Proceeds from Stock Options Exercised Stock awards vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Total compensation cost Allocated Share-based Compensation Expense Fair Value Disclosures [Abstract] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Non-recurring Fair Value, Measurements, Nonrecurring [Member] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Capitalized servicing rights Capitalized Mortgage Servicing Rights [Member] Represents the details pertaining to capitalized mortgage servicing rights. Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Weighted Average Weighted Average [Member] Measurement Input Type [Axis] Measurement Input Type [Axis] Measurement Input Type [Domain] Measurement Input Type [Domain] Loss severity Measurement Input, Loss Severity [Member] Appraised value Measurement Input, Appraised Value [Member] Constant prepayment rate (CPR) Measurement Input, Constant Prepayment Rate [Member] Discount rate Measurement Input, Discount Rate [Member] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Fair Value of Collateral Fair Value Of Collateral Valuation Technique [Member] Fair value of collateral approach valuation technique used to measure fair value. Discounted Cash Flow Valuation Technique, Discounted Cash Flow [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Level 3 Fair Value, Inputs, Level 3 [Member] Quantitative information about the significant unobservable inputs within Level 3 Fair Value Measurement Inputs and Valuation Techniques [Line Items] Impaired loans Impaired Loans, Fair Value Disclosure Represents the amount of impaired loans assets reported on the balance sheet at period end measured at fair value by the entity. Capitalized servicing rights Servicing Asset at Fair Value, Amount Total Assets, Fair Value Disclosure Impaired loans, significant unobservable input value Impaired Financing Receivables, Measurement Input Impaired Financing Receivables, Measurement Input Servicing asset, significant unobservable input value Servicing Asset, Measurement Input Discontinued Operations and Disposal Groups [Abstract] Summary of Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] Earnings Per Share [Abstract] Schedule of Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Recurring Fair Value, Measurements, Recurring [Member] Commitments to lend Forward commitments Forward Contracts [Member] Historical Trend Historical Trend Valuation Technique [Member] Historical trend approach valuation technique used to measure fair value. Pricing Model Pricing Model Valuation Technique [Member] Pricing model approach valuation technique used to measure fair value. Closing Ratio Measurement Input, Closing Ratio [Member] Measurement Input, Closing Ratio [Member] Origination Costs, per loan Measurement Input, Origination Costs [Member] Measurement Input, Origination Costs [Member] Trading security Debt Securities, Trading Derivative asset Derivative Asset Servicing asset Servicing Asset Total Fair Value, Net Asset (Liability) Trading security, significant unobservable input value Debt Securities, Trading, Measurement Input Derivative asset, significant unobservable input value Derivative Asset, Measurement Input Stockholders' Equity Note [Abstract] Schedule of Actual and Required Capital Ratios Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Schedule of Components of Accumulated Other Comprehensive Income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Components of Other Comprehensive Income Comprehensive Income (Loss) [Table Text Block] Schedule of Gross Changes in Each Component of Accumulated Other Comprehensive Income Schedule of Changes in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Tabular disclosure of the changes in components of accumulated other comprehensive income (loss). Schedule of Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Statement of Comprehensive Income [Abstract] Net income from continuing operations Net Income (Loss) Attributable to Parent Other comprehensive income, before tax: Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Changes in unrealized loss on debt securities available-for-sale Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax Income taxes related to other comprehensive income: Other Comprehensive Income (Loss), Tax, Parenthetical Disclosures [Abstract] Changes in unrealized loss on debt securities available-for-sale Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax Total other comprehensive income/(loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Total comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Receivables [Abstract] Trouble Debt Restructuring on Financing Receivables [Roll Forward] Trouble Debt Restructuring on Financing Receivables [Roll Forward] Trouble Debt Restructuring on Financing Receivables [Roll Forward] Balance at beginning of the period Financing Receivable, Modifications, Recorded Investment Principal payments Financing Receivable Troubled Debt Restructuring Principal Payments Represents the amount of principal payment of financing receivables modified by troubled debt restructurings. TDR status change Financing Receivable Troubled Debt Restructuring Status Change Represents the amount of troubled debt restructurings status change in which troubled debt restructuring loans with a specified interest rate equal to or greater than the rate that the entity was willing to accept at the time of the restructuring for a new loan with comparable risk and the loan was on current payment status and not impaired based on the terms specified by the restructuring agreement. Other reductions Financing Receivable Troubled Debt Restructuring Other Increase (Decrease) Financing Receivable Troubled Debt Restructuring Other Increase (Decrease) Newly identified TDRs Financing Receivable Troubled Debt Restructuring Additions Represents the amount of additions of financing receivables which were newly identified as troubled debt restructurings. Balance at end of the period Statement of Stockholders' Equity [Abstract] Common stock, cash dividends declared (in dollars per share) Common Stock, Dividends, Per Share, Declared Preferred stock, cash dividends declared (in dollars per share) Preferred Stock, Dividends Per Share, Declared Income Statement [Abstract] Statement [Table] Statement [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Mortgage banking originations Mortgage Banking [Member] Loan related income Bank Servicing [Member] Deposit related fees Deposit Account [Member] Insurance commissions and fees Insurance Revenue [Member] Insurance Revenue [Member] Wealth management fees Asset Management Fees [Member] Asset Management Fees [Member] Total fee income Banking [Member] Statement [Line Items] Statement [Line Items] Interest and dividend income from continuing operations Interest and Dividend Income, Operating [Abstract] Loans Interest and Fee Income, Loans and Leases Securities and other Interest and Dividend Income, Securities, Operating Total interest and dividend income Interest and Dividend Income, Operating Interest expense from continuing operations Interest Expense [Abstract] Deposits Interest Expense, Deposits Borrowings Interest Expense, Borrowings Total interest expense Interest Expense Net interest income from continuing operations Interest Income (Expense), Net Non-interest income from continuing operations Noninterest Income [Abstract] Other, net Noninterest Income, Other Gain/(loss) on securities, net Debt and Equity Securities, Gain (Loss) Gain on sale of business operations and other assets, net Gain (Loss) on Disposition of Business Total non-interest income Noninterest Income Total net revenue from continuing operations Revenues Provision for loan losses Provision for Loan and Lease Losses Non-interest expense from continuing operations Noninterest Expense [Abstract] Compensation and benefits Labor and Related Expense Occupancy and equipment Occupancy and Equipment This element represent as Occupancy And Equipment. Technology and communications Communications and Information Technology Marketing and promotion Marketing Expense Professional services Professional Fees FDIC premiums and assessments Federal Deposit Insurance Corporation Premium Expense Other real estate owned and foreclosures Other Real Estate Owned This element represent as Other Real Estate Owned. Amortization of intangible assets Amortization of Intangible Assets Acquisition, restructuring, and other expenses Other Nonrecurring Expense Other Other Noninterest Expense Total non-interest expense Noninterest Expense Income from continuing operations 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 from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest (Loss) from discontinued operations before income taxes Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax Income tax (benefit) Discontinued Operation, Tax Effect of Discontinued Operation Net (loss) from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Net income Preferred stock dividend Preferred Stock Dividends, Income Statement Impact Income available to common shareholders Net Income (Loss) Available to Common Stockholders, Basic Basic earnings per common share: Earnings Per Share, Basic [Abstract] Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Discontinued operations (in dollars per share) Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share Total (in dollars per share) Earnings Per Share, Basic Diluted earnings per common share: Earnings Per Share, Diluted [Abstract] Continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Discontinued operations (in dollars per share) Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share Total (in dollars per share) Earnings Per Share, Diluted Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Receivable Type [Axis] Receivable Type [Axis] Receivable [Domain] Receivable [Domain] Business Activities Loans Loans From Business Activities [Member] Represents information pertaining to the loans from business activities. Acquired Loans Loans Acquired From Business Combinations [Member] Represents information pertaining to the loans acquired from business combinations. 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] Commercial and industrial loans Commercial and Industrial Loans Portfolio Segment [Member] Commercial and Industrial Loans Portfolio Segment [Member] Residential mortgages Residential Portfolio Segment [Member] Consumer Consumer Portfolio Segment [Member] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Axis] Class of Financing Receivable, Type [Domain] Class of Financing Receivable, Type [Domain] Construction Construction Loans [Member] Real Estate Real Estate Loan [Member] 1-4 family 1 to 4 Family [Member] Class of financing receivables related to 1 to 4 Family financing receivables. Home equity Home Equity Loan [Member] Auto and other Auto And Other Receivable [Member] Class of financing receivables related to auto and other financing receivables. 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] Non-Accrual Non Accrual [Member] Represents the category of financing receivables considered to be non-accrual. Classified Classified [Member] Represents the category of financing receivables considered to be classified. Criticized Criticized [Member] Credit quality information Financing Receivable, Recorded Investment [Line Items] Total Loans Loans and Leases Receivable, Net of Deferred Income Leases [Abstract] Schedule of ROU Assets and Lease Liabilities Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Summary of Supplemental Cash Flow Information Related to Leases Lease, Cost [Table Text Block] Schedule of Maturity Analysis of Operating Lease Liability Lessee, Operating Lease, Liability, Maturity [Table Text Block] Schedule of Maturity Analysis of Finance Lease Liability Finance Lease, Liability, Maturity [Table Text Block] DISCONTINUED OPERATIONS Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Total economic hedges Tax advantaged economic development bonds Nontaxable Municipal Bonds [Member] Interest rate swap agreements and non-hedging derivative assets and liabilities Derivative Instrument Detail [Abstract] Notional amount Derivative, Notional Amount Weighted average maturity Derivative, Average Remaining Maturity Weighted average rate, received Derivative, Weighted Average Rate, Received Represents information pertaining to the derivative weighted average rate which is received. Weighted average rate, contract pay rate Derivative, Weighted Average Rate, Paid Represents information pertaining to the derivative weighted average rate which is paid. Estimated fair value asset (liability) Derivative Assets (Liabilities), at Fair Value, Net Lease Right-of-Use Assets Assets, Lessee [Abstract] Assets, Lessee [Abstract] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Finance lease right-of-use assets Finance Lease, Right-of-Use Asset Total Lease Right-of-Use Assets Lease, Right-of-Use Asset Lease, Right-of-Use Asset Lease Liabilities Liabilities, Lessee [Abstract] Liabilities, Lessee [Abstract] Operating lease liabilities Operating Lease, Liability Finance lease liabilities Finance Lease, Liability Total Lease Liabilities Lease, Liability Lease, Liability Schedule of Financing Receivables Past Due [Table] Schedule of Financing Receivables Past Due [Table] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Axis] Financing Receivables, Period Past Due [Domain] Financing Receivables, Period Past Due [Domain] 30-59 Days Past Due Financing Receivables, 30 to 59 Days Past Due [Member] 60-89 Days Past Due Financing Receivables, 60 to 89 Days Past Due [Member] 90 Days or Greater Past Due Financing Receivables, Equal to Greater than 90 Days Past Due [Member] Other commercial real estate Other Receivable [Member] Class of financing receivables related to other financing receivables. Financing Receivable, Recorded Investment, Past Due [Line Items] Financing Receivable, Recorded Investment, Past Due [Line Items] Total Past Due Financing Receivable, Recorded Investment, Past Due Current Financing Receivable, Recorded Investment, Current Acquired Credit Impaired Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net Total loans Past Due 90 days and Accruing Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Commercial loans Commercial Portfolio Segment [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] First Choice Loan Services, Inc. [Member] First Choice Loan Services, Inc. [Member] First Choice Loan Services, Inc. [Member] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Discontinued Operations, Held-for-sale [Member] Discontinued Operations, Held-for-sale [Member] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Assets Disposal Group, Including Discontinued Operation, Assets [Abstract] Loans held for sale, at fair value Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net Premises and equipment, net Disposal Group, Including Discontinued Operation, Property, Plant and Equipment Other assets Disposal Group, Including Discontinued Operation, Other Assets Total assets Disposal Group, Including Discontinued Operation, Assets Liabilities Disposal Group, Including Discontinued Operation, Liabilities [Abstract] Other liabilities Disposal Group, Including Discontinued Operation, Other Liabilities Total liabilities Disposal Group, Including Discontinued Operation, Liabilities Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Advances from the FHLB Federal Home Loan Bank Certificates and Obligations (FHLB) [Member] Federal Reserve Bank Advances Federal Reserve Bank Advances [Member] Federal Home Loan Bank Certificates And Obligations F H L B Amortizing Advances Federal Home Loan Bank Certificates And Obligations F H L B Amortizing Advances [Member] Represents information pertaining to federal home loan bank (FHLB) amortizing advances. Subordinated borrowings Private Placement Subordinated Notes [Member] Represents information pertaining to the private placement fixed and floating rate junior subordinated notes. Junior subordinated borrowings Junior Subordinated Debt [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Three-month LIBOR rate Debt Instrument Variable Rate Three Month L I B O R [Member] Represents the three-month London Interbank Offered Rate used to calculate the variable interest rate of the debt instrument. LIBOR London Interbank Offered Rate (LIBOR) [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Trust I Berkshire Hills Capital Trust I [Member] Represents information pertaining to Berkshire Hills Capital Trust I. Debt Instrument [Line Items] Debt Instrument [Line Items] Line of credit, current Line of Credit, Current Long-term line of credit Long-term Line of Credit Short-term debt Short-term Debt Long-term borrowings Long-term Debt Maturity period Debt Instrument, Term Principal amount of debt issued Debt Instrument, Face Amount Discount rate Debt Instrument, Issuance Discount Rate Represents the discount rate at the issuance of the debt instrument. Fixed interest rate Debt Instrument, Interest Rate, Stated Percentage Maturity period with fixed interest rate Debt Instrument Fixed Interest Term Represents the period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, bearing fixed interest rate. Interest rate margin Debt Instrument, Basis Spread on Variable Rate Unamortized debt issuance expense Unamortized Debt Issuance Expense Common stock of trust Common Stock of Trust Held, Percentage Represents the percentage of common stock of a trust held by the entity. Common stock of trust included in other asset Common Stock of Trust Held Value Represents the amount of common stock of a trust held by the entity. Sole asset of trust in form of debt Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust Variable interest rate Debt Instrument, Interest Rate, Effective Percentage Period up to which interest payments can be deferred Interest Payment Deferment Period Represents the period up to which the interest payments may be deferred. Organization, Consolidation and Presentation of Financial Statements [Abstract] BASIS OF PRESENTATION Business Description and Basis of Presentation [Text Block] Investments, Debt and Equity Securities [Abstract] Summary of Securities Available for Sale, Held to Maturity, and Marketable Equity Securities Marketable Securities [Table Text Block] Schedule of Estimated Fair Value of Available for Sale (“AFS”) and Held to Maturity (“HTM”) Securities Segregated by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Schedule of Securities Available for Sale and Held to Maturity with Unrealized Losses, Segregated by Duration Schedule of Unrealized Loss on Investments [Table Text Block] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Realized gains on AFS securities Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Domain] Amount Reclassified From Accumulated Other Comprehensive Income (loss) Reclassification out of Accumulated Other Comprehensive Income [Member] Amounts reclassified out of each component of accumulated other comprehensive income Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Non-interest income Tax (expense) benefit Amortized cost Debt Securities, Trading, Amortized Cost Trading security, at fair value Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Commercial counterparties Commercial Counterparties [Member] Represents information pertaining to the commercial counterparties. Institutional counterparties Institutional Counterparties [Member] Represents information pertaining to the institutional counterparties. Cash collateral pledged Derivative, Collateral, Right to Reclaim Cash Amortized cost of securities pledged as collateral to derivative counterparties Derivative Securities Pledged as Collateral Amortized Cost Represents the amortized cost of securities that are pledged as collateral to the derivative counterparties. Fair value of securities as pledged collateral to derivative counterparties Financial Instruments, Owned and Pledged as Collateral, at Fair Value Interest expense Fixed rate of interest Derivative, Fixed Interest Rate Credit valuation adjustments Derivative, Credit Risk Valuation Adjustment Derivative Assets (Liabilities) Net Amount of credit risk valuation adjustments to the net of derivative assets (derivative liabilities) to properly reflect the credit quality of the counterparties. Net asset position Derivative Asset, Fair Value, Amount Offset Against Collateral Derivative liability Derivative Liability Amount of collateral posted for the net liability positions Collateral Already Posted, Aggregate Fair Value Fair Value Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Table] Fair Value Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Table] Schedule of information required and determined to be provided for purposes of reconciling beginning and ending balances of fair value measurements of assets and liabilities using significant unobservable inputs (level 3). Such reconciliation, separately presenting changes during the period, at a minimum, may include, but is not limited to: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset and liabilities. Operating Activities [Axis] Operating Activities [Axis] Operating Activities [Domain] Operating Activities [Domain] Discontinued Operations Discontinued Operations [Member] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Trading Security Securities (Assets) [Member] Changes in Level 3 assets and liabilities that were measured at fair value on a recurring basis Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Changes in Level 3 assets that were measured at fair value on a recurring basis Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Balance at the beginning of the period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Unrealized gain/(loss), net recognized in other non-interest income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Paydown of trading security Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Additions to servicing rights Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) Balance at the end of the period Unrealized gains (losses) relating to instruments still held at the end of the period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Related to Assets Still Held This element represents the total unrealized net gains included in net income related to assets still held as of the balance sheet date. Derivative Asset (Liability) Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] Beginning balance Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs Unrealized gain/(loss), net recognized in other non-interest income Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings Transfers to held for sale loans Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers to Loans and Leases Held for Sale Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Transfers to Loans and Leases Held for Sale Ending balance LOANS Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Basis of Presentation Consolidation, Policy [Policy Text Block] Reclassifications Reclassification, Policy [Policy Text Block] Recently Adopted Accounting Principles and Future Application of Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Statement of Financial Position [Abstract] Assets Assets [Abstract] Cash and due from banks Cash and Due from Banks Short-term investments Cash Equivalents, at Carrying Value Total cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Marketable equity securities, at fair value Marketable Securities Securities available for sale, at fair value Available-for-sale Securities Securities held to maturity (fair values of $375,980 and $371,224) Debt Securities, Held-to-maturity Federal Home Loan Bank stock and other restricted securities Federal Home Loan Bank Stock and Other Restricted Securities at Cost This element represent as Federal Home Loan Bank Stock And Other Restricted Securities. Total securities Investments Loans held for sale, at fair value Loans Receivable Held-for-sale, Net, Not Part of Disposal Group or Discontinued Operation Amount of loans held for sale, including but not limited to, commercial and consumer loans. Excludes loans not part of a disposal group or discontinued operation. Commercial real estate loans Loans Receivable, Gross, Commercial, Real Estate Commercial and industrial loans Loans Receivable, Gross, Commercial and Industrial Residential mortgages Loans and Leases Receivable, Gross, Consumer, Mortgage Consumer loans Loans and Leases Receivable, Gross, Consumer, Real Estate Less: Allowance for loan losses Loans and Leases Receivable, Allowance Net loans Loans and Leases Receivable, Net Amount Premises and equipment, net Property, Plant and Equipment, Net Goodwill Goodwill Other intangible assets Intangible Assets, Net (Excluding Goodwill) Cash surrender value of bank-owned life insurance policies Bank Owned Life Insurance Deferred tax assets, net Deferred Tax Assets, Net Other assets Other Assets Assets from discontinued operations Total assets Assets Liabilities Liabilities [Abstract] Demand deposits Demand Deposit Accounts NOW and other deposits Deposits, Negotiable Order of Withdrawal (NOW) Money market deposits Deposits, Money Market Deposits Savings deposits Deposits, Savings Deposits Time deposits Time Deposits Total deposits Deposits Long-term Federal Home Loan Bank advances Long-term Federal Home Loan Bank Advances Subordinated borrowings Junior Subordinated Notes Total borrowings Debt and Capital Lease Obligations Other liabilities Other Liabilities Liabilities from discontinued operations Total liabilities Liabilities Shareholders’ equity Stockholders' Equity Attributable to Parent [Abstract] Preferred Stock (Series B non-voting convertible preferred stock - $0.01 par value; 2,000,000 shares authorized, 521,607 shares issued and outstanding in 2019; 2,000,000 shares authorized, 521,607 shares issued and outstanding in 2018 Preferred Stock, Value, Issued Common stock ($.01 par value; 100,000,000 shares authorized and 46,211,894 shares issued and 45,521,962 shares outstanding in 2019; 100,000,000 shares authorized, 46,211,894 shares issued and 45,416,855 shares outstanding in 2018) Common Stock, Value, Issued Additional paid-in capital - common stock Additional Paid in Capital, Common Stock Unearned compensation Deferred Compensation Equity Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Treasury stock, at cost (689,932 shares in 2019 and 795,039 shares in 2018) Treasury Stock, Value Total shareholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and shareholders’ equity Liabilities and Equity Stock Options Outstanding Stock-based compensation plans Non-vested Stock Awards Outstanding, Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Balance at the beginning of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Stock awards vested (in shares) Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Balance at the end of the period (in shares) Non-vested Stock Awards Outstanding, Weighted-Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Balance at the beginning of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Stock awards vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Balance at the end of the period (in dollars per share) Stock Options Outstanding, Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Balance at the beginning of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Stock options exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Balance at the end of the period (in shares) Exercisable options at the end of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Stock Options Outstanding, Weighted-Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Balance at the beginning of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Stock options exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Expired (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Balance at the end of the period (in dollars per share) Exercisable options at the end of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price TRADING SECURITY Disclosure of Trading Securities and Certain Trading Assets [Text Block] The entire disclosure for trading securities. Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Series B Convertible Preferred Stock Convertible Preferred Stock [Member] Fair Value Debt Securities, Held-to-maturity, Fair Value Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Treasury stock (in shares) Treasury Stock, Shares New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] ASU 2016-02 Accounting Standards Update 2016-02 [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Lease, right-of-use asset Lease, liability Statement of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Net (loss) from discontinued operations 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] Net amortization of securities Accretion (Amortization) of Discounts and Premiums, Investments Change in unamortized net loan costs and premiums Change in Unamortized Net Loan Costs and Premiums This element represent as Change In Unamortized Net Loan Costs And Premiums. Premises and equipment depreciation and amortization expense Depreciation, Depletion and Amortization, Nonproduction Stock-based compensation expense Share-based Compensation Accretion of purchase accounting entries, net Amortization Amortization of other intangibles Income from cash surrender value of bank-owned life insurance policies Bank Owned Life Insurance Income Securities (gains) losses, net Marketable Securities, Realized Gain (Loss) Net (decrease) in loans held-for-sale Increase (Decrease) in Loans Held-for-sale Change in right-of-use lease assets Increase (Decrease) In Lease, Right-Of-Use Assets Increase (Decrease) In Lease, Right-Of-Use Assets Change in lease liabilities Increase (Decrease) In Lease, Liabilities Increase (Decrease) In Lease, Liabilities Loss on disposition of assets Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Amortization of interest in tax-advantaged projects Amortization of Tax Credits Represent the information pertaining to amortization of tax credits Net change in other Other Noncash Income (Expense) Net cash provided by operating activities of continuing operations Net Cash Provided by (Used in) Operating Activities, Continuing Operations Net cash (used) provided by operating activities of discontinued operations Cash Provided by (Used in) Operating Activities, Discontinued Operations Net cash (used) provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Net decrease in trading security Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI Purchases of marketable equity securities Payments to Acquire Marketable Securities Proceeds from sales of marketable equity securities Proceeds from Sale and Maturity of Marketable Securities Purchases of securities available for sale Payments to Acquire Debt Securities, Available-for-sale Proceeds from sales of securities available for sale Proceeds from Sale of Debt Securities, Available-for-sale Proceeds from maturities, calls, and prepayments of securities available for sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Purchases of securities held to maturity Payments to Acquire Held-to-maturity Securities Proceeds from maturities, calls, and prepayments of securities held to maturity Proceeds from Maturities, Prepayments and Calls of Held-to-maturity Securities Net change in loans Payments for (Proceeds from) Loans and Leases Purchase of Federal Home Loan Bank stock Payments to Acquire Federal Reserve Bank Stock Proceeds from sale of Federal Home Loan Bank stock Proceeds from Sale of Federal Reserve Bank Stock Net investment in limited partnership tax credits Payments for (Proceeds from) Other Investing Activities Purchase of premises and equipment, net Payments to Acquire Property, Plant, and Equipment Net cash provided (used) by investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Net increase in deposits Increase (Decrease) in Deposits Proceeds from Federal Home Loan Bank advances and other borrowings Proceeds from Issuance of Long-term Debt Repayments of Federal Home Loan Bank advances and other borrowings Repayments of Long-term Debt Common and preferred stock cash dividends paid Payments of Ordinary Dividends, Common Stock Net cash (provided) used by financing activities Net Cash Provided by (Used in) Financing Activities Net change in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Cash and cash equivalents at beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Cash and cash equivalents at end of period Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Interest paid on deposits Interest Paid on Deposits This element represent as Interest Paid On Deposits. Interest paid on borrowed funds Interest Paid, Excluding Capitalized Interest, Operating Activities Income taxes paid, net Income Taxes Paid, Net Other non-cash changes: Other Noncash Investing and Financing Items [Abstract] Other net comprehensive income Real estate owned acquired in settlement of loans Real Estate Owned Acquired in Settlement of Loans Represents the value of real estate acquired in settlement of loans through non cash transactions. Operating Lease Liabilities, Payments Due [Abstract] Operating Lease Liabilities, Payments Due [Abstract] 2019 Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 2020 Lessee, Operating Lease, Liability, Payments, Due Year Two 2021 Lessee, Operating Lease, Liability, Payments, Due Year Three 2022 Lessee, Operating Lease, Liability, Payments, Due Year Four 2023 Lessee, Operating Lease, Liability, Payments, Due Year Five Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Total undiscounted lease payments Lessee, Operating Lease, Liability, Payments, Due Less amounts representing interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Lease liability Finance Lease Liabilities, Payments, Due [Abstract] Finance Lease Liabilities, Payments, Due [Abstract] 2019 Finance Lease, Liability, Payments, Remainder of Fiscal Year 2020 Finance Lease, Liability, Payments, Due Year Two 2021 Finance Lease, Liability, Payments, Due Year Three 2022 Finance Lease, Liability, Payments, Due Year Four 2023 Finance Lease, Liability, Payments, Due Year Five Thereafter Finance Lease, Liability, Payments, Due after Year Five Total undiscounted lease payments (1) Finance Lease, Liability, Payments, Due Less amounts representing interest (1) Finance Lease, Liability, Undiscounted Excess Amount Lease liability (1) CAPITAL RATIOS AND SHAREHOLDERS' EQUITY Stockholders' Equity Note Disclosure [Text Block] Schedule of Loans Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Schedule of Activity in the Accretable Yield for the Acquired Loan Portfolio that Falls Under the Review of ASC 310-30, Accounting for Certain Loans or Debt Securities Acquired in a Transfer Schedule of Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Accretable Yield Movement [Table Text Block] Tabular disclosure of changes in accretable yield for purchased credit impaired finance receivables by way of additions, accretion, reclassifications and disposals during the period. Summary of Past Due Loans Past Due Financing Receivables [Table Text Block] Summary of Information Pertaining to Non-Accrual Loans Schedule of Financing Receivables, Non Accrual Status [Table Text Block] Schedule of Loans Evaluated for Impairment Schedule of Loans Evaluated for Impairment [Table Text Block] Tabular disclosure related to loans evaluated for impairment. Summary of Impaired Loans Impaired Financing Receivables [Table Text Block] Summary of the Average Recorded Investment and Interest Income Recognized on Impaired Loans Impaired Financing Receivables Average Balances and Related Interest Income Recognized [Table Text Block] Tabular disclosure of average recorded investment in impaired loans and related interest income recognized for the periods indicated. Schedule of Recorded Investment and Number of Modifications for TDRs Identified During the Period Troubled Debt Restructurings on Financing Receivables [Table Text Block] Schedule of TDR Activity Financing Receivable Troubled Debt Restructuring Activity [Table Text Block] Tabular disclosure of activity of troubled debt restructuring financial receivables. Investment Holdings [Table] Investment Holdings [Table] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Municipal bonds and obligations US States and Political Subdivisions Debt Securities [Member] Agency collateralized mortgage obligations Collateralized Debt Obligations [Member] Agency mortgage-backed securities Residential Mortgage Backed Securities [Member] Agency commercial mortgage-backed securities Commercial Mortgage Backed Securities [Member] Corporate bonds Corporate Bond Securities [Member] Trust preferred securities Trust Preferred Securities Subject to Mandatory Redemption [Member] Other bonds and obligations Other Debt Obligations [Member] Tax advantaged economic development bonds Tax Advantaged Economic Development Bonds [Member] Represents the information pertaining to the tax advantaged economic development bonds. Investment Holdings [Line Items] Investment Holdings [Line Items] Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] Available for sale securities, less than twelve months, gross unrealized losses Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Available for sale securities, over twelve months, gross unrealized losses Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Available for sale securities, continuous unrealized loss position, accumulated loss Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] Available for sale securities, continuous unrealized loss position, less than twelve months, fair value Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Available for sale securities, continuous unrealized loss position, over twelve months, fair value Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Available for sale securities, continuous unrealized loss position, fair value Debt Securities, Available-for-sale, Unrealized Loss Position Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position [Abstract] Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract] Debt Securities, Held-to-maturity, Unrealized Loss Position, Accumulated Loss [Abstract] Held-to-maturity securities, continuous unrealized loss position, less than twelve months, accumulated loss Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Held-to-maturity securities, continuous unrealized loss position, over twelve months, gross unrealized losses Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Held to maturity securities, accumulated unrecognized holding loss Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract] Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract] Held to maturity securities, accumulated unrecognized holding loss, less than twelve months, fair value Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value Held to maturity securities, accumulated unrecognized holding loss, over twelve months, fair value Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value Held to maturity securities, accumulated unrecognized holding loss, fair value Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value Securities available for sale and held to maturity Debt Securitives, Held To Maturity Securities and Available For Sale Securities, Continuous Unrealized Loss Position [Abstract] Held to maturity and available for sale securities continuous unrealized loss position, less than twelve months, aggregate losses Debt Securities, Available-for-sale and Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Represents the excess of amortized cost basis over the fair value of securities that have been in a loss position for less than twelve months for those securities that are categorized as held-to-maturity and available-for-sale. Held to maturity and available for sale securities continuous unrealized loss position, less than twelve months, fair value Debt Securities, Available-for-sale and Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months Represents the aggregate fair value of investments in debt and equity securities categorized as held-to-maturity and available-for-sale that have been in a continuous unrealized loss position for less than twelve months. Held to maturity and available for sale securities continuous unrealized loss position, over twelve months, aggregate losses Debt Securities, Available-for-sale and Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Represents the excess of amortized cost basis over the fair value of securities that have been in a loss position for twelve months or longer for those securities that are categorized as held-to-maturity and available-for-sale. Held to maturity and available for sale securities continuous unrealized loss position, over twelve months, fair value Debt Securities, Available-for-sale and Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer Represents the aggregate fair value of investments in debt and equity securities categorized as held-to-maturity and available-for-sale that have been in a continuous unrealized loss position for twelve months or longer. Held to maturity and available for sale securities continuous unrealized loss position, aggregate losses Debt Securities, Available-for-sale and Held-to-maturity, Unrealized Loss Position, Accumulated Loss Represents the excess of amortized cost basis over the fair value of securities that have been in a loss position, which are categorized as held-to-maturity and available-for-sale. Held to maturity and available for sale securities continuous unrealized loss position, fair value Debt Securities, Available-for-sale and Held-to-maturity, Unrealized Loss Position Represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized as held-to-maturity and available-for-sale securities. BORROWED FUNDS Debt Disclosure [Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Carrying Amount Reported Value Measurement [Member] Fair Value Estimate of Fair Value Measurement [Member] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Estimated fair values of financial instruments Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Financial Assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Trading security Debt Securities, Trading, and Equity Securities, FV-NI Marketable equity securities Equity Securities, FV-NI Securities available for sale Debt Securities, Available-for-sale Securities held to maturity FHLB bank stock and restricted securities Net loans Loans Receivable, Fair Value Disclosure Loans held for sale Loans Held-for-sale, Fair Value Disclosure Accrued interest receivable Interest Receivable Cash surrender value of bank-owned life insurance policies Cash Surrender Value, Fair Value Disclosure Derivative assets Derivative Asset, Fair Value, Gross Asset Financial Liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Total deposits Deposits, Fair Value Disclosure Short-term debt Short-term Debt, Fair Value Long-term Federal Home Loan Bank advances Federal Home Loan Bank Borrowings, Fair Value Disclosure Subordinated borrowings Subordinated Debt Obligations, Fair Value Disclosure Derivative liabilities Derivative Liability, Fair Value, Gross Liability 1-4 Family Number of Modifications Financing Receivable, Modifications, Number of Contracts Pre-Modification Outstanding Recorded Investment Financing Receivable, Modifications, Pre-Modification Recorded Investment Post-Modification Outstanding Recorded Investment Financing Receivable, Modifications, Post-Modification Recorded Investment Offsetting Liabilities [Table] Offsetting Liabilities [Table] Offsetting Liabilities [Line Items] Offsetting Liabilities [Line Items] Offsetting of Financial Liabilities and Derivative Liabilities Offsetting Derivative Liabilities [Abstract] Gross amounts of recognized liabilities Gross amounts offset in the Statements of Condition Derivative Liability, Fair Value, Gross Asset Net amounts of liabilities presented in the Statements of Condition Gross amounts not offset in the Statements of Condition, financial instruments Derivative Liability, Not Offset, Policy Election Deduction Gross amounts not offset in the Statements of Condition, cash collateral pledged Net amount Derivative Liability, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election Offsetting Assets [Table] Offsetting Assets [Table] Offsetting Assets [Line Items] Offsetting Assets [Line Items] Offsetting of Financial Assets and Derivative Assets Offsetting Derivative Assets [Abstract] Gross amounts of recognized assets Gross amounts offset in the Statements of Condition Derivative Asset, Fair Value, Gross Liability Net amounts of assets presented in the Statements of Condition Gross amounts not offset in the Statements of Condition, financial instruments Derivative Asset, Not Offset, Policy Election Deduction Gross amounts not offset in the Statements of Condition, cash collateral received Derivative, Collateral, Obligation to Return Cash Net amount Derivative Asset, Fair Value, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election Timing of disposal, term Disposal Group, Including Discontinued Operation, Timing Of Disposal, Term Disposal Group, Including Discontinued Operation, Timing Of Disposal, Term Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Allowance for loan losses Financing Receivable, Allowance for Credit Losses [Line Items] Loans receivable: balance at end of period Loans and Leases Receivable, Other Information [Abstract] Individually evaluated for impairment Financing Receivable, Individually Evaluated for Impairment Purchased credit-impaired loans Financing Receivable, Purchased Credit-Impaired Loans Financing Receivable, Purchased Credit-Impaired Loans Collectively evaluated for impairment Financing Receivable, Collectively Evaluated for Impairment Fair Value Option, Disclosures [Table] Fair Value Option, Disclosures [Table] Continuing Operations Continuing Operations [Member] Loans Held for Sale Loans Held For Sale [Member] Represents the details pertaining to loans held for sale. Loans Held for Sale Fair Value, Option, Quantitative Disclosures [Line Items] Aggregate Fair Value Aggregate Fair Value Less Aggregate Unpaid Principal Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND MARKETABLE EQUITY SECURITIES Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Accumulated other comprehensive (loss) AOCI Attributable to Parent [Member] Net unrealized holding gain (loss) on AFS securities Net unrealized holding (loss) on pension plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Other accumulated comprehensive income (loss), before tax AOCI before Tax, Attributable to Parent Income taxes related to items of accumulated other comprehensive income AOCI Tax, Attributable to Parent Securities available for sale Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] Amortized Cost Debt Securities, Available-for-sale, Amortized Cost Gross Unrealized Gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Fair Value Securities held to maturity Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] Amortized Cost Gross Unrealized Gains Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain Gross Unrealized Losses Marketable equity securities, amortized cost Equity Securities, FV-NI, Cost Marketable equity securities, gross unrealized gains Equity Securities, FV-NI, Unrealized Gain Marketable equity securities, gross unrealized losses Equity Securities, FV-NI, Unrealized Loss Marketable equity securities, fair value Total, amortized cost basis Debt Securities, Available-for-sale and Held-to-maturity, and Equity Securities, FV-NI, Amortized Cost Represents the cost of debt and equity securities, which are categorized as held-to-maturity and available-for-sale, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. Total, gross unrealized gain Debt Securities, Available-for-sale and Held-to-maturity, and Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax Represents the gross unrealized gains for securities, at a point in time, which are categorized as held-to-maturity and available-for-sale securities. Total, gross unrealized loss Debt Securities, Available-for-sale and Held-to-maturity, and Equity Securities, FV-NI, Accumulated Gross Unrealized Loss, before Tax Represents the gross unrealized losses for securities, at a point in time, which are categorized as held-to-maturity and available-for-sale securities. Total, fair value Debt Securities, Available-for-sale and Held-to-maturity, and Equity Securities, FV-NI Debt Securities, Available-for-sale and Held-to-maturity, and Equity Securities, FV-NI Schedule of Interest Rate Swap Agreements and Non-Hedging Derivative Assets and Liabilities Schedule of Derivative Instruments [Table Text Block] Schedule of Amounts Included in the Consolidated Statements of Income Related to Economic Hedges and Non-Hedging Derivatives Derivative Instruments, Gain (Loss) [Table Text Block] Schedule of Assets Subject to an Enforceable Master Netting Arrangement Offsetting Assets [Table Text Block] Schedule of Liabilities Subject to an Enforceable Master Netting Arrangement Offsetting Liabilities [Table Text Block] STOCK-BASED COMPENSATION PLANS Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Preferred stock Preferred Stock [Member] Common stock Common Stock [Member] Additional paid-in capital Additional Paid-in Capital [Member] Unearned compensation Deferred Compensation, Share-based Payments [Member] Retained earnings Retained Earnings [Member] Accumulated other comprehensive income/(loss) Treasury stock Treasury Stock [Member] ASU 2016-01 Accounting Standards Update 2016-01 [Member] ASU 2018-01 Accounting Standards Update 2018-01 [Member] Accounting Standards Update 2018-01 [Member] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance (in shares) Shares, Outstanding Balance at beginning of period Comprehensive income: Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Other comprehensive income (loss) Adoption of ASU Cumulative Effect of New Accounting Principle in Period of Adoption Cash dividends declared on common shares Dividends, Common Stock, Cash Cash dividends declared on preferred shares Dividends, Preferred Stock, Cash Forfeited shares (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Forfeited Forfeited shares Stock Issued During Period, Value, Restricted Stock Award, Forfeitures Exercise of stock options (in shares) Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Restricted stock grants (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Restricted stock grants Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Other, net (in shares) Stockholders' Equity, Other Shares Other, net Stockholders' Equity, Other Balance (in shares) Balance at end of period Schedule of Borrowed Funds Schedule of Debt [Table Text Block] Summary of Maturities of FHLBB Advances Schedule of Maturities and Weighted Average Interest Rates of Federal Home Loan Bank Advances [Table Text Block] Tabular disclosure of the contractual maturities and weighted average interest rates on borrowings or advances from Federal Home Loan Bank. Summary of Activity in the Stock Award and Stock Option Plans Share-based Compensation, Activity [Table Text Block] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Interest income Disposal Group, Including Discontinued Operation, Interest Income Interest expense Disposal Group, Including Discontinued Operation, Interest Expense Net interest income Disposal Group, Including Discontinued Operation, Interest Income, Net Disposal Group, Including Discontinued Operation, Interest Income, Net Non-interest income Disposal Group, Including Discontinued Operation, Other Income Total net revenue Disposal Group, Including Discontinued Operation, Revenue Non-interest expense Disposal Group, Including Discontinued Operation, Other Expense Loss from discontinued operations before income taxes Income tax (benefit) Number of grades in internal loan rating system (grade) Internal Loan Rating System Number of Grades The number of grades in the reporting entity's internal loan rating system. Delinquency period of loans based on which risk rating is assigned to loans (in days) Financing Receivable Risk Rating Delinquency Period Represents the delinquency period of loans based on which risk rating is assigned to loans. Period within which loans are current, based on which risk rating is assigned (in days) Financing Receivable Risk Rating Current Period Represents the current period of loans based on which risk rating is assigned to loans. Allowance for losses on acquired loans under Subtopic ASC 310-30 Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Total Fair Value Debt securities Debt Securities [Member] Marketable equity securities Equity Securities [Member] Agency collateralized mortgage obligations Collateralized Mortgage Obligations [Member] Agency residential mortgage-backed securities 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] Trading security Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Accounting Standards Updates 2016-01 and 2018-02 Accounting Standards Updates 2016-01 And 2018-02 [Member] Accounting Standards Updates 2016-01 And 2018-02 [Member] Gross changes in each component of accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Other comprehensive (loss) before reclassifications OCI, before Reclassifications, Net of Tax, Attributable to Parent Less: amounts reclassified from accumulated other comprehensive income (loss) Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Less: amounts reclassified from accumulated other comprehensive income (loss) related to adoption of ASU 2016-01 and ASU 2018-02 Reclassification From AOCI, Accounting Standards Update, Current Period, Net Of Tax, Attributable To Parent Reclassification From AOCI, Accounting Standards Update, Current Period, Net Of Tax, Attributable To Parent Summary of Financial Assets and Financial Liabilities Measured at Fair Value on a Recurring Basis Segregated by the Level of the Valuation Inputs Within the Fair Value Hierarchy Utilized to Measure Fair Value Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Loans Held for Sale Fair Value Option, Disclosures [Table Text Block] Schedule of Changes in Level 3 Assets and Liabilities That Were Measured at Fair Value on a Recurring Basis Fair Value Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Table Text Block] Tabular disclosure of the fair value measurement of assets and liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset and liabilities. Schedule of Quantitative Information About the Significant Unobservable Inputs Within Level 3 Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Summary of Applicable Non-Recurring Fair Value Measurements Fair Value Measurements, Nonrecurring [Table Text Block] Summary of Estimated Fair Values, and Related Carrying Amounts, of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Deposits [Abstract] DEPOSITS Deposit Liabilities Disclosures [Text Block] LOAN LOSS ALLOWANCE Allowance for Credit Losses [Text Block] EARNINGS PER SHARE Earnings Per Share [Text Block] DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES Derivative Instruments and Hedging Activities Disclosure [Text Block] Time less than $100,000 Time Deposits, Less than $100,000 Time $100,000 through $250,000 Time Deposits, $100,000 Through $250,00 Time Deposits, $100,000 Through $250,00 Time more than $250,000 Time Deposits, $100,000 or More Total time deposits Brokered time deposits Brokered Time Deposits Represents the amount of time deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities. Reciprocal deposits Reciprocal Money Market Deposits Represents the reciprocal deposits. Banking and Thrift, Interest [Abstract] NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES Interest Income and Interest Expense Disclosure [Text Block] Non-accrual loans Non-accrual loans Financing Receivable, Recorded Investment, Nonaccrual Status Advances from the FHLB Short-term borrowings Weighted average rate on short-term borrowings Short-term Debt, Weighted Average Interest Rate, at Point in Time Weighted average rate on long-term borrowings Long-term Debt, Weighted Average Interest Rate, at Point in Time Weighted average rate Debt, Weighted Average Interest Rate FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Document and Entity Information Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Current Fiscal Year End Date Current Fiscal Year End Date Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Mortgage-backed securities Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Purchases of securities available for sale Proceeds from sale of available-for-sale securities Debt securities, available-for-sale, realized gain Debt Securities, Available-for-sale, Realized Gain Debt securities, available-for-sale, realized loss Debt Securities, Available-for-sale, Realized Loss Available-for-sale, securities in unrealized loss positions Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions Available for sale securities portfolio, number of securities Debt Securities. Available-for-sale, Number of Positions Represents the number of securities in the entity's portfolio of available-for-sale securities. Available for sale securities, continuous unrealized loss position, aggregate losses Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Qualitative Disclosure, Aggregate Losses Percentage Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Qualitative Disclosure, Aggregate Losses Percentage Held-to-maturity, securities in unrealized loss positions Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Held-to-maturity securities portfolio, number of securities Held-to-maturity, Securities Portfolio Number of Securities Held-to-maturity, Securities Portfolio Number of Securities Held to maturity securities, continuous unrealized loss position, aggregate losses Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Qualitative Disclosure, Aggregate Losses Percentage Represents the aggregate unrealized losses, expressed as a percentage of the amortized cost of the securities in a continuous unrealized loss position categorized as held-to-maturity and available-for-sales securities. Schedule of Net Interest Income After Provision for Loan Losses Interest Income and Interest Expense Disclosure [Table Text Block] Average recorded investment, with no related allowance Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment