Statistical Measurement [Domain] Statistical Measurement [Domain] Award Timing Predetermined Award Timing Predetermined [Flag] Advance from Federal Home Loan Bank, Fiscal Year Maturity [Abstract] Advance from Federal Home Loan Bank, Fiscal Year Maturity [Abstract] Asset Class [Axis] Asset Class [Axis] Entity File Number Entity File Number Paid-in Capital [Member] Additional Paid-in Capital [Member] Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Interest rate swaps Interest Rate Swap [Member] Investment in bank-owned life insurance Investment in BOLI Bank Owned Life Insurance Tabular List, Table Tabular List [Table Text Block] Term loans amortized cost, prior year Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year Loans charged off Total gross charge-offs Charge-offs Financing Receivable, Allowance for Credit Loss, Writeoff Card Interchange Fees Card Interchange Fees [Member] Card Interchange Fees Carrying Amounts and Estimated Fair Values of Financial Instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Pledged Status [Axis] Pledged Status [Axis] Available for sale debt securities, unrealized losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Other Expenses Other Expenses Weighted average rate for scheduled maturity through the end of the current year Federal Home Loan Bank, Advance, Maturity, Average Interest Rate, Year One Measurement Basis [Axis] Measurement Basis [Axis] Basic earnings per common share Basic earnings per common share Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Weighted average other-than-insignificant payment delay (in months) Weighted Average Other-than-Insignificant Payment Delay (in months) Period of increase in weighted average other-than-insignificant payment delay modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) [Member] Discount for costs to sell Discount For Costs To Sell This represents the discount applied to appraisals of collateral for costs to sell. Unrealized losses on securities below investment grade Unrealized losses on securities below investment grade The unrealized losses of debt securities that are below investment grade as of the balance sheet date. Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] 2026 Stock Repurchase Program 2026 Stock Repurchase Program [Member] 2026 Stock Repurchase Program Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Domain] Wholesale brokered time deposits Wholesale brokered time deposits Amount of interest-bearing time deposits placed by or through the assistance of a deposit broker, also known as wholesale brokered time deposits. Change in fair value under fair value option election Fair Value, Option, Changes in Fair Value, Gain (Loss) Statement of Operations and Total Assets by Reportable Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Time Deposit Maturities, Year Five Time Deposit Maturities, Year Five Common Equity Tier 1 Capital for Capital Adequacy Purposes to Risk-Weighted Assets Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum Purchases of mortgage-backed securities available for sale Purchases of mortgage-backed securities available for sale The cash outflow for the purchase of securities issued by a governmental agency or corporation (for example, GNMA or FHLMC) or by private issuers (for example, banks and mortgage banking enterprises) secured and repaid from underlying mortgages, which were designated as available for sale when acquired. Adjustment to Compensation, Amount Adjustment to Compensation Amount Items Recorded at Fair Value on a Nonrecurring Basis Fair Value Measurements, Nonrecurring [Table Text Block] (Increase) decrease in other assets Increase (Decrease) in Other Operating Assets Nature of Operations Consolidation, Policy [Policy Text Block] Share-based compensation Share-Based Payment Arrangement, Noncash Expense Employee Stock Option Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Net loans Loans, net of allowance for credit losses on loans Financing Receivable, after Allowance for Credit Loss Disaggregation of Revenue [Abstract] Disaggregation of Revenue [Abstract] Total weighted average rate Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, Total Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, Total Loss on cash flow hedge included in AOCI(L) upon termination Loss on cash flow hedge included in AOCI(L) upon termination The amount of the loss on a cash flow hedge that is included in AOCI(L), upon termination of the cash flow hedge, and that will be amortized into earnings over the remaining life of the original cash flow hedge term. Taxable interest on debt securities Interest Income, Securities, Operating, Taxable Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Change in fair value of cash flow hedges, income tax benefit (expense) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax NOW accounts Deposits, Negotiable Order of Withdrawal (NOW) Cash dividends declared Dividends, Common Stock, Cash Total shareholders' equity Shareholders' equity Shareholders' equity Equity, Attributable to Parent Fair Value by Measurement Frequency [Axis] Measurement Frequency [Axis] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Debt Securities, Available-for-Sale [Table] Debt Securities, Available-for-Sale [Table] Other Comprehensive Income (Loss), Net of Tax [Abstract] Other Comprehensive Income (Loss), Net of Tax [Abstract] Insider Trading Policies and Procedures [Line Items] Common stock, shares authorized Common Stock, Shares Authorized Hedging Designation [Domain] Hedging Designation [Domain] Schedule of Federal Home Loan Bank Advances, by Branch of FHLBB Bank [Table] Federal Home Loan Bank, Advance, Branch of FHLBank [Table] Total liabilities and shareholders’ equity Liabilities and Equity Recurring Fair Value, Recurring [Member] Derivative liabilities not designated as hedging instruments Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value Net Unrealized Losses on Defined Benefit Plan Obligations Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Tier 1 Leverage Capital Required To Be Well Capitalized Banking Regulation, Tier 1 Leverage Capital, Well Capitalized, Minimum Common Equity Tier 1 Capital To Be Well Capitalized Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Well Capitalized, Minimum Cover [Abstract] Cover [Abstract] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Maximum Maximum Maximum [Member] Defined benefit plan obligation remeasurement, income tax benefit (expense) Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax Expenditures for long-lived assets Segment, Expenditure, Addition to Long-Lived Assets Available for sale debt securities, securities in continuous unrealized loss position, fair value Debt Securities, Available-for-Sale, Unrealized Loss Position Available for sale debt securities maturities after 10 years amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Gain on sale of bank-owned properties, net Sale and Leaseback Transaction, Gain (Loss), Net Forward sale commitments Forward Contracts [Member] Tier 1 Capital Required To Be Well Capitalized Banking Regulation, Tier 1 Risk-Based Capital, Well Capitalized, Minimum Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Purchases of other equity investments, net Payments to Acquire Other Investments Treasury Stock [Member] Treasury Stock, Common [Member] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Tier 1 Leverage Capital Required To Be Well Capitalized to Average Assets Banking Regulation, Tier 1 Leverage Capital Ratio, Well Capitalized, Minimum Operating lease liabilities Operating Lease, Liability Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Interest rate fair value hedge liability at fair value Interest Rate Fair Value Hedge Liability at Fair Value 90 or More Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Liabilities: Liabilities [Abstract] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Weighted average maturity extension (in months) Financing Receivable, Modified, Weighted Average Term Increase from Modification Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Tier 1 Leverage Capital to Average Assets Banking Regulation, Tier 1 Leverage Capital Ratio, Actual Federal Home Loan Bank of Boston Federal Home Loan Bank of Boston [Member] Interest rate contracts with customers Interest Rate Swap with customers [Member] Interest Rate Swap with customers [Member] Net proceeds from the sale of bank-owned property Proceeds from Sale of Property, Plant, and Equipment Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Shareholders' Equity Regulatory Capital Requirements under Banking Regulations [Text Block] Change in fair value of cash flow hedges , net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Gross charge-offs, five years ago or more Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Writeoff Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Total interest expense Total interest expense Interest Expense, Operating Tier 1 Capital Required To Be Well Capitalized to Risk Weighted-Assets Banking Regulation, Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum Total comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Name Measure Name Service charges on deposit accounts Service charges on deposits The amount of fee revenue associated with service charges on deposits recognized in accordance with Topic 606, Revenue from Contracts with Customers. Available for sale debt securities maturities within 1 year fair value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Total other comprehensive income (loss), pre-tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Net increase (decrease) in deposits Increase (Decrease) in Deposits Maturities, calls and principal payments of mortgage-backed securities available for sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Document Fiscal Period Focus Document Fiscal Period Focus Exercise of stock options and issuance of other compensation-related equity awards, net of awards surrendered, value Exercise of Stock Options and Issuance of Other Compensation Related Equity Instruments, Value Value of stock issued during the period as a result of the exercise of stock options and value of stock related to restricted stock awards issued during the period, net of the stock value of such awards forfeited. Weighted Average Rate of Time Deposits [Abstract] Weighted Average Rate of Time Deposits [Abstract] Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Fair Value of Mortgage Loans Held for Sale Fair Value Option, Disclosures [Table Text Block] Award Timing Method Award Timing Method [Text Block] Summary of Investments Unrealized Gain (Loss) on Investments [Table Text Block] Award Type Award Type [Axis] Less: derivative asset amounts offset Derivative Liability, Subject to Master Netting Arrangement, Gross Asset and Collateral, Right to Reclaim Cash, Offset Hedging Relationship [Domain] Hedging Relationship [Domain] Call features of callable debt securities Callable Debt Securities, Call Feature, Period Callable Debt Securities, Call Feature, Period Corporation Parent Company [Member] Activity in Other Comprehensive Income (Loss) Comprehensive Income (Loss) [Table Text Block] Total assets Total assets at period end Assets Trading Symbol Trading Symbol Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Nontaxable interest on debt securities Interest Income, Securities, Operating, Tax Exempt Commercial & industrial Commercial Other [Member] Class of financing receivables related to commercial and industrial financing receivables Net Interest Income Net Interest Income [Member] Net Interest Income Financing Receivable, Allowance for Credit Loss [Roll Forward] Financing Receivable, Allowance for Credit Loss [Roll Forward] Entity Address, City or Town Entity Address, City or Town Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Class of Financing Receivable [Axis] Financing Receivable Information by Portfolio Segment [Axis] Class of Financing Receivable [Axis] Weighted average rate for scheduled maturity in year five Federal Home Loan Bank, Advance, Maturity, Average Interest Rate, Year Five Net proceeds from sale of portfolio loans Proceeds from Sale, Loan and Lease, Held-for-Investment Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Time Deposit Maturities, Year Two Time Deposit Maturities, Year Two Maturities of Time Deposits [Abstract] Maturities of Time Deposits [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Total Capital for Capital Adequacy Purposes to Risk-Weighted Assets Banking Regulation, Total Risk-Based Capital Ratio, Capital Adequacy, Minimum Common Equity Tier 1 Capital to Risk-Weighted Assets Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Actual Purchase of intangible asset in asset acquisition Payments to Acquire Intangible Assets Cash dividends declared per share Common Stock, Dividends, Per Share, Declared Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Contract cost assets Capitalized Contract Cost, Net Less: collateral pledged, derivative liabilities Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Other Income Other Noninterest Income [Member] Other Noninterest Income Level 2 Fair Value, Inputs, Level 2 [Member] Equity investments in real estate limited partnership Payments for (Proceeds from) Real Estate Partnership Investment, Net Amount of Gain (Loss) Recognized in Statements of Income (Loss) Derivative, Gain (Loss) on Derivative, Net Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] Carrying value of TLMs Financing Receivable, Excluding Accrued Interest, Modified, Accumulated Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Total noninterest income Total noninterest income Noninterest income Noninterest Income Common stock, shares outstanding Common stock, shares outstanding Common stock, shares outstanding Common Stock, Shares, Outstanding Asset Pledged as Collateral Asset Pledged as Collateral [Member] Net unamortized loan origination costs Loans Receivable Net Deferred Cost Originated Reflects cumulative amount of net costs paid by borrowers which have not been taken into expense. Net gains on loan sales, including changes in fair value Gain (Loss) on Sales of Loans, Net Standby letter of credit with FHLB Standby letter of credit with FHLB The amount remaining to be drawn on at the balance sheet date associated with a standby letter of credit with the FHLB. PEO PEO [Member] Loans Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Noninterest expense: Noninterest Expense [Abstract] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Cash and due from banks Cash and Due from Banks Tier 1 Leverage Capital Banking Regulation, Tier 1 Leverage Capital, Actual Securities by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Class of Financing Receivable [Domain] Financing Receivable Allowance [Domain] Class of Financing Receivable [Domain] Noncash Activities: Noncash Investing and Financing Items [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Common Equity Tier 1 Capital Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Actual Common Equity Tier 1 Capital [Abstract] Banking Regulation, Common Equity Tier 1 Risk-Based Capital [Abstract] Interest-bearing demand deposits Interest-Bearing Domestic Deposit, Demand Interest rate fair value hedge asset at fair value Interest Rate Fair Value Hedge Asset at Fair Value Gross charge-offs, current year Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Time deposits Time Deposits Net proceeds from stock option exercises and issuance of other equity awards, net of awards surrendered Proceeds from Issuance or Sale of Equity Retained Earnings [Member] Retained Earnings [Member] Weighted average interest rate reduction Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification Pledged Status [Domain] Pledged Status [Domain] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Derivative assets Derivative Asset Income tax expense Income Tax Expense (Benefit) Available for sale debt securities, securities in continuous unrealized loss position, greater than 12 months, fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Purchases of loans Payments to Acquire Loans Receivable Net change in fair value of cash flow hedges, tax benefit (expense) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Other assets Other Assets Nonrecurring Fair Value, Nonrecurring [Member] Time Deposit Maturities, after Year Five Time Deposit Maturities, after Year Five Identifiable intangible assets, net Intangible Assets, Net (Excluding Goodwill) Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Common Equity Tier 1 Capital Required for Capital Adequacy Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Capital Adequacy, Minimum Derivatives Designated as Hedging Instruments Designated as Hedging Instrument [Member] Financing Receivable, Modified [Table] Financing Receivable, Modified [Table] Other income Noninterest Income, Other Provision Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) Product and Service [Domain] Product and Service [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Derivative Instruments, Gain (Loss) by Hedging Relationship [Axis] Hedging Relationship [Axis] Net change in fair value of cash flow hedges Net change in fair value of cash flow hedges, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Total liabilities at fair value on a recurring basis Liabilities, Fair Value Disclosure Notional amount Derivative, Notional Amount Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Defined benefit plan obligation remeasurement, net of tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Federal Home Loan Bank Branch [Domain] Federal Home Loan Bank Branch [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Tier 1 Capital (to Risk-Weighted Assets): Banking Regulation, Tier 1 Risk-Based Capital [Abstract] Equity Additional Information [Table] [Line Items] Equity, Class of Treasury Stock [Line Items] Junior subordinated debentures Interest Expense, Junior Subordinated Debentures City Area Code City Area Code Allowance for Credit Losses on Loans Rollforward Financing Receivable, Allowance for Credit Loss [Table Text Block] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Loan related derivative income Loan Related Derivative Income [Member] Loan Related Derivative Income Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Interest rate cash flow hedge asset at fair value Interest Rate Cash Flow Hedge Asset at Fair Value (Increase) decrease in operating lease right-of-use assets (Increase) decrease in operating lease right-of-use assets (Increase) decrease in operating lease right-of-use assets Class of Treasury Stock [Table] Class of Treasury Stock [Table] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Junior subordinated debentures Junior subordinated debentures Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Accrued interest receivable on loans Accrued interest receivable Interest Receivable Fair Value Hedging Instruments Fair Value Hedging [Member] Income From Bank-owned Life Insurance Income From Bank-owned Life Insurance [Member] Income From Bank-owned Life Insurance Cash Flow Hedging Instruments Cash Flow Hedging [Member] Recoveries Financing Receivable, Allowance for Credit Loss, Recovery Net interest income Net interest income Net interest income Interest Income (Expense), Operating Other liabilities Other Liabilities Goodwill Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Pension plan settlement charge reclassified into earnings, pre-tax Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax Tier 1 Capital Banking Regulation, Tier 1 Risk-Based Capital, Actual Scheduled maturity in year four Federal Home Loan Bank, Advance, Maturity, Year Four Gross derivative liabilities Derivative Liability, Subject to Master Netting Arrangement, before Offset Statement, Equity Components [Axis] Equity Components [Axis] Standby letters of credit Standby Letters of Credit [Member] Loans and Leases Receivable Disclosure [Table] Loans and Leases Receivable Disclosure [Table] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of Reportable Segments Number of Reportable Segments Time Deposits, Weighted Average Interest Rate, Maturities Year Three Time Deposits, Weighted Average Interest Rate, Maturities Year Three Amortization of net actuarial losses into earnings, net of tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax Supplemental Disclosures: Supplemental Cash Flow Information [Abstract] Available for sale debt securities, amortized cost Available for sale debt securities maturities total amortized cost Debt Securities, Available-for-Sale, Amortized Cost Other Performance Measure, Amount Other Performance Measure, Amount Entity Address, State or Province Entity Address, State or Province Derivative Gain (Loss) Income Statement Location [Axis] Derivative Gain (Loss) Income Statement Location [Axis] Derivative Gain (Loss) Income Statement Location Total interest and dividend income Total interest income and dividend income Interest and Dividend Income, Operating Special Mention [Member] Special Mention [Member] Financial Asset, Period Past Due [Domain] Financial Asset, Aging [Domain] Derivative Instrument Risk [Axis] Derivative Instrument [Axis] Individual: Individual [Axis] Interest on mortgage loans held for sale Interest on mortgage loans held for sale Interest income recognized on mortgage loans held for sale Pension plan settlement charge reclassified into earnings, income tax benefit (expense) Other Comprehensive Income (Loss), Defined Benefit Plan, Adjustment for Settlement or Curtailment Gain (Loss), Tax Commercial real estate Commercial Real Estate Portfolio Segment [Member] Paid-in capital Additional Paid in Capital, Common Stock Aging of TLMs Financing Receivable, Modified, Past Due [Table Text Block] Net cash provided by (used in) investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Interest payments Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Tier 1 Capital Required For Capital Adequacy Purposes Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy, Minimum Term loans amortized cost, three years ago Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year Entity Interactive Data Current Entity Interactive Data Current Banking Commercial Banking [Member] The represents the banking reporting segment. Tax benefit (expense) from stock option exercises and other equity awards Tax Benefit from Stock Option Exercises and Issuance of Other Compensation-related Equity Instruments Reductions in the entity's income taxes that arise when compensation cost (from stock option and other equity instruments compensation) recognized on the entity's tax return exceeds compensation cost from share-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities. Carrying Value Reported Value Measurement [Member] Nonaccrual loans included in past due loans Loans Receivable, Past Due, Nonaccrual Reflects carrying value of loans which are past due and on nonaccrual status. Financing Receivable, Modified [Line Items] Financing Receivable, Modified [Line Items] Equity [Abstract] Equity [Abstract] Nonaccrual loans Financing Receivable, Nonaccrual Interest income: Interest and Dividend Income, Operating [Abstract] Other Comprehensive Income Location [Domain] Other Comprehensive Income Location [Domain] Total noninterest expense Total noninterest expenses Noninterest Expense Business Segments Segment Reporting Disclosure [Text Block] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] 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] Derivatives Not Designated as Hedging Instruments Not Designated as Hedging Instrument [Member] Other-than-Insignificant Payment Delay Payment Deferral [Member] Allowance for Credit Losses on Loans Allowance for Credit Losses [Text Block] Deposits Interest Expense, Deposits Term loans amortized cost, current year Financing Receivable, Year One, Originated, Current Fiscal Year Pension plan settlement charge Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment Noninterest income: Noninterest Income [Abstract] Net amounts Derivative, Fair Value, Amount Offset Against Collateral, Net Revolving loans amortized cost Financing Receivable, Revolving Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Share repurchase program, authorized amount, number of shares Share Repurchase Program, Authorized, Number of Shares Weighted Average Weighted Average [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Amortization of intangibles Amortization of intangibles Amortization of Intangible Assets Federal Home Loan Bank, Advances, Weighted Average Interest Rate [Abstract] Federal Home Loan Bank, Advances, Weighted Average Interest Rate [Abstract] Non-maturity deposits Non-maturity deposits The balance of non-maturity deposits, which is total deposits less time deposits. Common Domain Members [Abstract] Changes in Components of Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Depreciation expense Depreciation, Depletion and Amortization Entity Central Index Key Entity Central Index Key PEO Name PEO Name Noninterest-bearing deposits Noninterest-bearing demand deposits Noninterest-Bearing Domestic Deposit, Demand Total revenues Revenues Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Credit Quality Indicators Financing Receivable Credit Quality Indicators [Table Text Block] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Loans originated for sale Payment for Origination, Loan, Mortgage, Held-for-Sale Tier 1 Leverage Capital Required for Capital Adequacy Purposes Banking Regulation, Tier 1 Leverage Capital, Capital Adequacy, Minimum Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Less: derivative liability amounts offset Derivative Asset, Subject to Master Netting Arrangement, Gross Liability and Collateral, Obligation to Return Cash, Offset Segments [Axis] Segments [Axis] Summary of Derivative Instruments Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Mirror interest rate contracts with counterparties Interest Rate Mirror Swaps with Counterparties [Member] This category includes interest rate mirror swaps with counterparties. Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Tier 1 Capital Required for Capital Adequacy Purposes to Risk Weighted-Assets Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum Time Deposits, Weighted Average Interest Rate, Maturities Year Four Time Deposits, Weighted Average Interest Rate, Maturities Year Four Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Collateral Dependent Individually Analyzed Loans Collateral Dependent Individually Analyzed Loans [Table Text Block] Tabular disclosure of the carrying value of collateral dependent individually analyzed loans. Weighted average rate for scheduled maturity in year three Federal Home Loan Bank, Advance, Maturity, Average Interest Rate, Year Three Amortized cost of callable debt securities Callable Debt Securities Amortized Cost This represents the amortized cost for callable debt securities. Beginning balance Ending balance Off-Balance-Sheet, Credit Loss, Liability Fair Value of Loans Held for Sale [Table] Fair Value Option, Disclosures [Table] Assets: Assets [Abstract] Weighted average rate for scheduled maturity in year two Federal Home Loan Bank, Advance, Maturity, Average Interest Rate, Year Two Time deposits greater than FDIC limit Time deposits greater than FDIC limit Time deposits that meet or exceed the $250,000 FDIC limit Underlying Security Market Price Change Underlying Security Market Price Change, Percent Total loans Financing Receivable, before Allowance for Credit Loss Fair Value Measurements Fair Value Disclosures [Text Block] Amortization of terminated cash flow hedge loss Other Comprehensive Income (Loss), Cash Flow Hedge, Reclassification for Discontinuance, before Tax Shareholders' Equity: Equity, Attributable to Parent [Abstract] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Address Line One Entity Address, Address Line One Summary of TLMs Financing Receivable, Modified [Table Text Block] Treasury stock purchased under Stock Repurchase Program, amount acquired Cost of shares repurchased under share repurchase program Treasury Stock, Value, Acquired, Cost Method Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] 30-59 Financial Asset, 30 to 59 Days Past Due [Member] Weighted Average Rate, Time Deposits Weighted Average Rate Domestic Deposit, Time Deposits Scheduled maturity in year three Federal Home Loan Bank, Advance, Maturity, Year Three Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Off-Balance Sheet, Credit Loss, Liability [Roll Forward] Off-Balance-Sheet, Credit Loss, Liability [Roll Forward] Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Loans and Leases Receivable Disclosure [Line Items] Loans and Leases Receivable Disclosure [Line Items] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Gross derivative assets Derivative Asset, Subject to Master Netting Arrangement, before Offset Fair Value as of Grant Date Award Grant Date Fair Value Net cash flow hedge (gains) losses reclassified into earnings, income tax benefit (expense) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Entity Registrant Name Entity Registrant Name Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Total Capital To Be Well Capitalized to Risk Weighted-Assets Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum Salaries and employee benefits Labor and Related Expense Depreciation of premises and equipment Depreciation, Nonproduction Tier 1 Leverage Capital Required for Capital Adequacy Purposes to Average Assets Banking Regulation, Tier 1 Leverage Capital Ratio, Capital Adequacy, Minimum Document Quarterly Report Document Quarterly Report Available for sale debt securities, securities in continuous unrealized loss position, less than 12 months, fair value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Tier 1 Capital to Risk Weighted-Assets Banking Regulation, Tier 1 Risk-Based Capital Ratio, Actual Total assets at fair value on a recurring basis Total assets at fair value on a nonrecurring basis Assets, Fair Value Disclosure Provision for credit losses Provision for credit losses Provision for Loan, Lease, and Other Losses Other Other consumer [Domain] Portfolio segment of the company's total financing receivables related to other consumer loans that are not home equity lines or loans. Deposits Deposit Liabilities Disclosures [Text Block] Income from bank-owned life insurance Income from bank-owned life insurance Bank Owned Life Insurance Income Available for sale debt securities, securities in continuous unrealized loss position, number of securities Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Deposits: Deposits [Abstract] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Total Past Due Total Past Due Financial Asset, Past Due [Member] Nonaccrual Loans Financing Receivable, Nonaccrual [Table Text Block] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Obligations of U.S. government agencies and U.S. government-sponsored enterprises US Government-sponsored Enterprises Debt Securities [Member] Loans: Loans and Leases Receivable, Net Amount [Abstract] Net redemption (purchases) of Federal Home Loan Bank stock Payments for (Proceeds from) Federal Home Loan Bank Stock Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Accrued interest receivable Accrued Investment Income Receivable New Accounting Pronouncements and Changes in Accounting Principles [Abstract] Accounting Standards Update and Change in Accounting Principle [Abstract] Fair value of callable debt securities Callable Debt Securities Fair Value This represents the fair value for callable debt securities. Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Amortization of net actuarial losses into earnings, pre-tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Restatement Determination Date: Restatement Determination Date [Axis] Non-PEO NEO Non-PEO NEO [Member] Available for sale debt securities, allowance for credit losses Debt Securities, Available-for-Sale, Allowance for Credit Loss Other Comprehensive Income [Table] Accumulated Other Comprehensive Income (Loss) [Table] Gross charge-offs, revolving loans converted to term loans Financing Receivable, Revolving, Converted to Term Loan, Writeoff Federal Home Loan Bank advances FHLB advances Federal Home Loan Bank advances Advance from Federal Home Loan Bank Amounts reclassed from accumulated other comprehensive income (loss) Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Available for sale debt securities, unrealized gains Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Name Trading Arrangement, Individual Name Less: allowance for credit losses on loans Related Allowance Allowance, Beginning Balance Allowance, Ending Balance Financing Receivable, Allowance for Credit Loss All Award Types Award Type [Domain] Net change in fair value of cash flow hedges, pre-tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Change in fair value of cash flow hedges, pre-tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax TLMs with subsequent payment default Financing Receivable, Modified, Subsequent Default Equity Awards Adjustments Equity Awards Adjustments [Member] Mortgage loans held for sale, measured at fair value Loan, Held-for-Sale, Fair Value Disclosure Interest on FHLB advances Interest on FHLB advances [Member] Interest on FHLB advances FHLB Advances Maturity Summary Federal Home Loan Bank, Advance, Branch of FHLBank [Table Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Individual name issuer trust preferred debt securities Trust Preferred Securities Individual Name Issuers [Member] This category includes trust preferred securities individual name issuers. Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Total Capital To Be Well Capitalized Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum Trust preferred securities included in Tier 1 Capital Debt Instrument, Face Amount Derivative liabilities Derivative Financial Instruments, Liabilities [Member] Net change in defined benefit plan obligations, income tax benefit (expense) Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax Past Due [Member] Past Due [Member] Past Due [Member] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Fair Value Estimate of Fair Value Measurement [Member] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Wealth management revenues Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Available for sale debt securities maturities 1-5 years amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Name Awards Close in Time to MNPI Disclosures, Individual Name Individually analyzed loans Individually analyzed loans Carrying value of individually analyzed loans at the balance sheet date. Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Service Charges on Deposit Accounts Deposit Account [Member] Schedule of Available for Sale and Held to Maturity Securities [Line Items] Schedule of Available for Sale and Held to Maturty Securities [Line Items] Line items for schedule of Available for Sale and Held to Maturty Securities. Time Deposit Maturities, Year Four Time Deposit Maturities, Year Four Credit Loss [Abstract] Credit Loss [Abstract] Time Deposits, Weighted Average Interest Rate, Maturities Year Five Time Deposits, Weighted Average Interest Rate, Maturities Year Five Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Available for sale debt securities maturities 5-10 years amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Available for sale debt securities, securities in continuous unrealized loss position, greater than 12 months, number of securities Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions Share-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Treasury stock, at cost Treasury Stock, Value Change in fair value of available for sale debt securities, income tax benefit (expense) OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Accumulated other comprehensive income (loss) Accumulated other comprehensive income (loss), beginning balance Accumulated other comprehensive income (loss), ending balance Accumulated Other Comprehensive Income (Loss), Net of Tax Financial Instruments [Domain] Financial Instruments [Domain] Net change in fair value of available for sale debt securities OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Segment [Domain] Segments [Domain] Net unamortized premiums on purchased loans Loans Receivable Net Deferred Premium on Purchased Loans Reflects premiums over or discounts from face amounts of acquired loans that are being amortized into income as an adjustment to yield. Unused remaining available borrowing capacity with FHLB Line of Credit Facility, Remaining Borrowing Capacity Wealth Management Services Wealth Management Services [Member] This represents the wealth management services reporting segment. Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Home equity Home equity [Domain] Portfolio segment of the company's total financing receivables related to home equity lines and loans. Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Net cash flow hedge (gains) losses reclassified into earnings, net of tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Banking Regulation, Regulatory Capital Requirement, Compliance [Table] Banking Regulation, Regulatory Capital Requirement, Compliance [Table] Minimum Minimum [Member] Net interest income after provision for credit losses Net interest income (expense) after provision for credit losses Interest Income (Expense), after Provision for Loan Loss Net Unrealized Gains (Losses) on AFS Securities AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Mortgage loans held for sale, difference between fair value and amortized cost Mortgage Loans Held for Sale Difference between Fair Value and Principal Amount The difference between the fair value and principal amount of mortgage loans held for sale. Less: collateral pledged, derivative assets Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Interest expense: Interest Expense, Operating and Nonoperating [Abstract] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name Fair Value Measurement [Domain] Fair Value Measurement [Domain] Financial Instruments with Off Balance Sheet Risk Schedule of Fair Value, off-Balance-Sheet Risks [Table Text Block] Combination Combination of concessions [Member] Combination of concessions [Member] Purchases of other debt securities available for sale Payments to Acquire Debt Securities, Available-for-Sale Total Capital for Capital Adequacy Purposes Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum Borrowings Debt Disclosure [Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Obligations of states and political subdivisions US States and Political Subdivisions Debt Securities [Member] Securities in unrealized loss position, number of companies issuing securities Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Companies Issuing Securities Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Companies Issuing Securities Accrued interest payable Interest Payable Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Financial Asset, Period Past Due [Axis] Financial Asset, Aging [Axis] All Executive Categories All Executive Categories [Member] Collateral [Domain] Collateral Held [Domain] Outsourced services Outsourced services The total amount of third party vendor costs, which includes platform and product support costs. Common stock Common Stock, Value, Issued Accruing loans 90 days or more past due Financing Receivable, 90 Days or More Past Due, Still Accruing Interest and fees on loans Interest and Fee Income, Loans and Leases Pension plan settlement charge reclassified into earnings, net of tax Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Weighted average common shares outstanding - diluted Weighted average common shares outstanding for diluted EPS Weighted Average Number of Shares Outstanding, Diluted Commitments and contingencies (Note 15) Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Amortization of net actuarial losses into earnings, income tax benefit (expense) Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax Derivative [Table] Derivative [Table] Entity Small Business Entity Small Business Contract amount Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Asset Document Transition Report Document Transition Report Available for sale debt securities maturities 1-5 years fair value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Risk participation agreements Risk participation agreements [Member] Risk participation agreements Exercise of stock options and issuance of other compensation-related equity awards, net of awards surrendered, shares ExerciseOfStockOptionsAndIssuanceOfOtherCompensationRelatedEquityInstrumentsShares Shares of stock issued during the period as a result of the exercise of stock options and stock related to other compensation related equity instruments, net of the stock value of such awards forfeited. Residential properties in process of foreclosure Mortgage Loans in Process of Foreclosure, Amount Recently Issued Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Federal Home Loan Bank advances Interest Expense Federal Home Loan Bank advances Interest expense incurred during the reporting period on short-term and long-term borrowings associated with Federal Home Loan Bank and Federal Reserve Bank advances. Total Assets, Total [Member] Underlying Securities Award Underlying Securities Amount Gross charge-offs, revolving loans Financing Receivable, Revolving, Writeoff Commitment for equity investment in real estate limited partnerships Commitment for equity investment in real estate limited partnership Amount of the future commitment related to equity investment in real estate limited partnership, not yet paid in cash. Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Available for sale debt securities maturities after 10 years fair value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Derivative assets Derivative Financial Instruments, Assets [Member] Basis adjustment associated with fair value hedges Hedged Asset, Fair Value Hedge, Portfolio Layer Method, Hedged Layer, Fair Value, Cumulative Increase (Decrease) Appraisal adjustments Appraisal Adjustments This represents the adjustments to appraisal values to reflect market value declines or other discounts. Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] 60-89 Financial Asset, 60 to 89 Days Past Due [Member] Number of debt securities below investment grade Number of debt securities below investment grade Number of debt securities below investment grade Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Hedging Designation [Axis] Hedging Designation [Axis] Schedule of Available for Sale and Held to Maturity Securities [Table] Schedule of Available for Sale and Held to Maturity Securities [Table] Summary of information required and determined to be disclosed concerning available for sale and held to maturity securities which consist of all investments in certain debt and equity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. Other interest income Other Interest and Dividend Income Derivative asset balances, net of offset Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Scenario [Axis] Scenario [Axis] Scheduled maturity in year five Federal Home Loan Bank, Advance, Maturity, Year Five Net amortization of premiums and discounts on securities and loans Amortization of Debt Discount (Premium) Hedged item Hedged item [Member] Hedged item Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Earnings per Common Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Net change in defined benefit plan obligations Net change in defined benefit plan obligations, net of tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Advertising and promotion Marketing and Advertising Expense Derivative liability balances, net of offset Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Product and Service [Axis] Product and Service [Axis] Net cash flow hedge (gains) losses reclassified into earnings, pre-tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax Derivative Contract Type [Domain] Derivative Contract [Domain] Loss on cash flow hedge included in AOCI(L) upon termination, after tax Loss on cash flow hedged included in AOCI(L) upon termination, net of tax The amount of the loss on a cash flow hedge, net of tax, that is included in AOCI(L), upon termination of the cash flow hedge. Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Table] Revenue from contracts with customers Revenue from Contract with Customer, Excluding Assessed Tax Scheduled maturity after year five Federal Home Loan Bank, Advance, Maturity, after Year Five Federal Home Loan Bank Branch [Axis] Federal Home Loan Bank Branch [Axis] Scheduled maturity in year two Federal Home Loan Bank, Advance, Maturity, Year Two Carrying value of hedged item Derivative, Amount of Hedged Item All Individuals All Individuals [Member] Excise tax on share repurchases Sales and Excise Tax Payable Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Purchases of premises and equipment Payments to Acquire Property, Plant, and Equipment Transferred at Point in Time Transferred at Point in Time [Member] Name Forgone Recovery, Individual Name Proceeds from sales of loans, net Proceeds from Sale, Loan, Held-for-Sale Mortgage Banking Revenues Mortgage Banking [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Gross charge-offs, prior year Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff Nonaccrual loans with no ACL Financing Receivable, Nonaccrual, No Allowance Wealth Management Revenues Wealth Management Revenues Investment Advisory, Management and Administrative Service [Member] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Maturities, calls and principal payments of other debt securities available for sale Proceeds from Maturities, Prepayments and Calls of Other Investments Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Gross charge-offs, four years ago Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff Proceeds from Federal Home Loan Bank advances Proceeds from FHLBank Borrowings, Financing Activities Short-term investments Other Short-Term Investments Term loans amortized cost, five years ago or more Financing Receivable, Originated, More than Five Years before Current Fiscal Year Share repurchase program, authorized amount, percentage of total common stock Stock Repurchase Program, Authorized Amount, Percent of Total Common Stock Stock Repurchase Program, Authorized Amount, Percent of Total Common Stock Mortgage banking revenues Fees and Commissions, Mortgage Banking and Servicing Interest rate floors Interest Rate Floor [Member] Net gain on sale of bank-owned property Gain (Loss) on Sale of Properties Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Total other comprehensive income (loss), net of tax Total other comprehensive income (loss), net of tax Net other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Total commercial Commercial Portfolio Segment [Member] Derivative Instruments Effect in Statements of Income and Changes in Shareholders' Equity Derivative Instruments, Gain (Loss) [Table Text Block] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Level 1 Fair Value, Inputs, Level 1 [Member] Repayments of Federal Home Loan Bank advances Payments of FHLBank Borrowings, Financing Activities Nonaccrual loans current on payment Loans Receivable, Nonaccrual of Interest, Current Reflects carrying amount of loans on which no interest is being recognized, but are current as to the payment of principal and interest. Diluted earnings per common share Diluted earnings per common share Earnings Per Share, Diluted FDIC deposit insurance costs Federal Deposit Insurance Corporation Premium Expense Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Title of 12(g) Security Title of 12(b) Security Available for sale debt securities maturities 5-10 years fair value Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Carrying value of loan modified in a troubled loan modification (TLM) Carrying value of loan modified in a troubled loan modification (TLM) Financing Receivable, Excluding Accrued Interest, Modified in Period, Amount Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Mortgage loans held for sale, amortized cost Financing Receivable, Held-for-Sale Equipment Equipment Expense Quantitative Information About Level 3 Assets Measured at Fair Value on a Nonrecurring Basis Fair Value Inputs Nonrecurring Quantitative Information [Table Text Block] Tabular disclosure of qualitative information about the inputs used in the fair value measurement of nonrecurring assets. This disclosure may include, but is not limited to, the fair value of asset valuation techniques used to measure fair value, the inputs used to measure fair value, the ranges of the inputs and the weighted averages of the inputs. Treasury stock, shares Treasury Stock, Common, Shares Per share information: Earnings Per Share [Abstract] Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Current [Member] Current Payment Status [Member] Current Payment Status [Member] Weighted average rate for scheduled maturity after year five Federal Home Loan Bank, Advance, Maturity, Average Interest Rate, after Year Five Classified [Member] Classified [Member] A category of financing receivable which includes loans identified as "substandard", "doubtful" or "loss" based on criteria consistent with guidelines provided by banking regulators. Gross charge-offs, two years ago Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff Financing Receivable Portfolio Segment [Axis] Financing Receivable Portfolio Segment [Axis] Total Revenues Total revenues in scope of Topic 606 [Member] Total revenues in scope of Topic 606 Defined benefit plan obligation remeasurement, pre-tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax Time Deposit Maturities, Through the End of Current Year Time Deposit Maturities, Year One Financing Receivable, Allowance for Credit Loss [Line Items] Financing Receivable, Allowance for Credit Loss [Line Items] Income taxes paid Income Taxes Paid, Net Treasury stock repurchased Total number of treasury shares repurchased under share repurchase program Treasury Stock, Shares, Acquired Commitments to extend credit Commitments to Extend Credit [Member] Corporate bonds Corporate Bond Securities [Member] Award Timing Disclosures [Line Items] Measurement Frequency [Domain] Measurement Frequency [Domain] Change in fair value of available for sale debt securities, net of tax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Bank Subsidiaries [Member] Regulatory Capital Requirements Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] Schedule of Fair Value, Off-balance Sheet Risks [Table] Fair Value, off-Balance-Sheet Risk [Table] Loan Restructuring Modification [Domain] Loan Restructuring Modification [Domain] Net change in defined benefit plan obligations, pre-tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Term loans amortized cost, two years ago Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year Net income Net income Net income Net Income (Loss) Attributable to Parent Loan related derivative income Gain (Loss) on Derivative Instruments, Net, Pretax Time Deposits, Weighted Average Interest Rate, Maturities Through the End of Current Year Time Deposits, Weighted Average Interest Rate, Maturities Year One Securities in a Continuous Unrealized Loss Position Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Expiration Date Trading Arrangement Expiration Date Total Capital to Risk-Weighted Assets Banking Regulation, Total Risk-Based Capital Ratio, Actual Interest rate cash flow hedge liability at fair value Interest Rate Cash Flow Hedge Liability at Fair Value Time Deposits [Abstract] Allowance for Credit Losses on Unfunded Commitments Rollforward Allowance for Credit Losses on Unfunded Commitment [Table Text Block] Tabular disclosure of allowance for credit losses on unfunded commitments. Increase (decrease) in other liabilities Increase (Decrease) in Other Operating Liabilities Common Equity Tier 1 Capital To Be Well Capitalized to Risk-Weighted Assets Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum Mortgage Loans Held for Sale Mortgage Loans Held for Sale [Member] Mortgage Loans Held for Sale [Member] Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Premises and equipment, net Property, Plant and Equipment, Net Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Purchases of treasury stock Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Receivables from contracts with customers Contract with Customer, Asset, after Allowance for Credit Loss Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Entity Current Reporting Status Entity Current Reporting Status Receivables [Abstract] Receivables [Abstract] Derivative [Line Items] Derivative [Line Items] Derivative Gain (Loss) Income Statement Location [Domain] Derivative Gain (Loss) Income Statement Location [Domain] Derivative Gain (Loss) Income Statement Location [Domain] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Collateral [Axis] Collateral Held [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Available for sale debt securities maturities within 1 year amortized cost Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Time Deposits, Weighted Average Interest Rate, Maturities Year Two Time Deposits, Weighted Average Interest Rate, Maturities Year Two Retained earnings Retained Earnings (Accumulated Deficit) Money market accounts Deposits, Money Market Deposits Interest and Fees on Loans Interest and Fees on Loans [Member] Interest and Fees on Loans Residential real estate Residential Portfolio Segment [Member] Purchases of bank-owned life insurance Payment to Acquire Life Insurance Policy, Investing Activities Gain on sale of bank-owned properties, net Gain (Loss) on Disposition of Property Plant Equipment Time Deposits, Weighted Average Interest Rate, Maturities Greater than Five Years Time Deposits, Weighted Average Interest Rate, Maturities Greater than Five Years Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Executive Category: Executive Category [Axis] Transferred over Time Transferred over Time [Member] Available for sale debt securities, securities in continuous unrealized loss position, greater than 12 months, unrealized losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Available for sale debt securities, securities in continuous unrealized loss position, less than 12 months, number of securities Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions Current Fiscal Year End Date Current Fiscal Year End Date Net Unrealized Losses on Cash Flow Hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Available for sale debt securities, securities in continuous unrealized loss position, less than 12 months, unrealized losses Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Increase (decrease) in operating lease liabilities Increase (Decrease) in operating lease liabilities Increase (Decrease) in operating lease liabilities Total deposits Total deposits Deposits Federal Home Loan Bank, Advances, Branch of FHLBB Bank [Line Items] Federal Home Loan Bank, Advance, Branch of FHLBank [Line Items] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Summary of Loans Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Legal, audit and professional fees Professional Fees Federal Home Loan Bank stock, at cost FHLB stock Federal Home Loan Bank Stock Statement [Table] Statement [Table] Derivative assets not designated as hedging instruments Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value Derivative liabilities Derivative Liability Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Term loans amortized cost, four years ago Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Other expenses Other Noninterest Expense Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Pass [Member] Pass [Member] Loan Restructuring Modification [Axis] Loan Restructuring Modification [Axis] Dividends on Federal Home Loan Bank stock Dividends on corporate stock and Federal Home Loan Bank stock Dividend income on corporate stock and Federal Home Loan Bank stock. Available for sale debt securities, securities in continuous unrealized loss position, unrealized losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Items Recorded at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Weighted average antidilutive common stock equivalents Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Maturity period of callable debt securities Callable Debt Securities, Maturity Period Callable Debt Securities, Maturity Period All Adjustments to Compensation All Adjustments to Compensation [Member] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Amendment Flag Amendment Flag Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Axis] Scheduled maturity through the end of the current year Federal Home Loan Bank, Advance, Maturity, Year One Revolving loans converted to term loans Revolving loans converted to term loans Revolving loans that converted to terms loans for purposes of the tabular vintage disclosure by credit quality indicator. Past Due Loans Financing Receivable, Past Due [Table Text Block] Gain on sale of bank-owned properties, net Gain on sale of bank-owned properties, net [Member] Gain on sale of bank-owned properties, net Amortized cost of securities below investment grade Amortized cost of securities below investment grade The amortized cost of debt securities that are below investment grade as of the balance sheet date. Interest-bearing deposits Total interest-bearing deposits Interest-Bearing Deposit Liabilities Weighted average rate for scheduled maturity in year four Federal Home Loan Bank, Advance, Maturity, Average Interest Rate, Year Four Termination Date Trading Arrangement Termination Date Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Interest-earning deposits with correspondent banks Interest-Bearing Deposits in Banks and Other Financial Institutions Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Time Deposit Maturities, Year Three Time Deposit Maturities, Year Three Measure: Measure [Axis] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Tier 1 Capital (to Average Assets): Banking Regulation, Tier 1 Leverage Capital [Abstract] Weighted average common shares outstanding - basic Weighted average common shares outstanding for basic EPS Weighted Average Number of Shares Outstanding, Basic Calculation of Earnings per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Total consumer Consumer Portfolio Segment [Member] Summary of Deposits Deposit Liabilities, Type [Table Text Block] Segment Reporting [Abstract] Segment Reporting [Abstract] Other comprehensive income (loss), net of tax: OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Total Capital (to Risk-Weighted Assets): Banking Regulation, Total Capital [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Entity Tax Identification Number Entity Tax Identification Number Scenario [Domain] Scenario [Domain] Unused line of credit with FHLB Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds Gross charge-offs, three years ago Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff Change in fair value of available for sale debt securities, pre-tax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Average price per share for shares repurchased Average price per share for shares repurchased The average price per share for shares repurchased under a repurchase program. Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Consolidated Entities [Axis] Consolidated Entities [Axis] Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares issued Common Stock, Shares, Issued Nonaccrual loans with an ACL Nonaccrual loans with an ACL Amortized cost of financing receivable on nonaccrual status with an allowance for credit loss. Excludes net investment in lease. Financing Receivable Financing Receivable [Member] Use of Estimates Use of Estimates, Policy [Policy Text Block] Mortgage-backed securities issued by U.S. government-sponsored agencies and U.S. government-sponsored enterprises Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member] Total Capital Banking Regulation, Total Capital, Actual Cash dividends paid Payments of Dividends Total other comprehensive income (loss), income tax benefit (expense) Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Net occupancy Occupancy, Net Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Appraisals of collateral Appraisals Of Collateral [Member] This represent appraisals of collateral valuation techinque used in fair value disclosures. Current Financial Asset, Not Past Due [Member] Total liabilities Liabilities Interest rate collars Interest Rate Collar [Member] A derivative instrument that represents simultaneously buying an interest rate cap and selling an interest rate floor. Interest rate lock commitments Interest Rate Lock Commitments [Member] Amortized cost balance of closed-pool residential real estate loans used in fair value hedges Financial Asset, Closed Portfolio, Portfolio Layer Method, Amortized Cost Period end TLM balance as a percentage of period end total loan balance Financing Receivable, Excluding Accrued Interest, Modified in Period, to Total Financing Receivables, Percentage Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] 2025 Stock Repurchase Program 2025 Stock Repurchase Program [Member] 2025 Stock Repurchase Program Collateral Dependent Individually Analyzed Collateral Dependent Individually Analyzed [Member] Collateral Dependent Individually Analyzed [Member] Schedule of Time Certificates of Deposit Maturities Time Certificates of Deposit Scheduled Maturities and Weighted Average Interest Rates Paid [Table Text Block] The tabular disclosure of time certificates of deposit scheduled maturities and weighted average interest rates paid. Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Asset Class [Domain] Asset Class [Domain] Savings accounts Deposits, Savings Deposits Statement [Line Items] Comprehensive Income [Line Items] Statement [Line Items] Total Noninterest Income Total noninterest income in scope of Topic 606 [Member] Total noninterest income in scope of Topic 606 Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Common Stock [Member] Common Stock [Member] Available for sale debt securities, fair value Debt Securities, Available-for-Sale Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Net (increase) decrease in loans Payments for (Proceeds from) Other Loans and Leases Card interchange fees Card interchange fees Fees earned from debit card transactions. Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Dilutive effect of common stock equivalents Weighted Average Number of Shares Outstanding, Diluted, Adjustment