Equity Components [Axis] Securities [Member] Derivatives [Member] Defined Benefit Plan [Member] Geographical [Axis] Massachusetts and Granby and Enfield, Connecticut [Member] Business Acquisition [Axis] Chicopee Bancorp Inc [Member] Retirement Plan Type [Axis] 401 (k) [Member] Subsequent Event Type [Axis] Subsequent Event [Member] Property Plant And Equipment By Type [Axis] Building [Member] Leasehold Improvements [Member] Range [Axis] Minimum [Member] Maximum [Member] Furniture And Equipment [Member] Financial Instrument [Axis] Government-Sponsored Enterprise Obligations [Member] State And Municipal Bonds [Member] Corporate Bonds [Member] Debt Securities [Member] US Government Guaranteed Mortgage-Backed Securities [Member] Collateralized Mortgage Backed Securities [Member] Mutual Funds [Member] Debt Securities [Member] States and Municipal Bonds [Member] Government-Sponsored Mortgage-Backed Securities [Member] Class of Financing Receivable [Axis] Commercial Real Estate [Member] Residential Real Estate - Residential 1-4 Family [Member] Residential Real Estate - Home Equity [Member] Commercial And Industrial [Member] Consumer [Member] Residential Real Estate [Member] Unallocated [Member] Financing Receivables, Period Past Due [Axis] 30-59 Days Past Due [Member] 60 - 89 Days Past Due [Member] Greater than 90 Days Past Due [Member] Internal Credit Assessment [Axis] Loans rated 1-4 [Member] Loans rated 5 [Member] Loans rated 6 [Member] Pass (Rated 1 - 4) [Member] Special Mention (Rated 5) [Member] Substandard (Rated 6) [Member] Land [Member] Finite-Lived Intangible Assets by Major Class [Axis] Core Deposit Intangibles [Member] Short-term Debt, Type [Axis] Customer Repurchase Agreements [Member] Debt Instrument [Axis] FHLBB Advances [Member] Lender Name [Axis] FHLBB Ideal Way Line of Credit [Member] Correspondent Bank [Member] Correspondent Bank [Member] Longterm Debt Type [Axis] FHLBB Advances - Fixed Rate [Member] FHLBB Advances - Variable Rate [Member] Long Term Debt [Member] Award Type [Axis] Stock Options [Member] Plan Name [Axis] LTI Plan for 2016 [Member] Vesting [Axis] Original Threshold [Member] Original Target [Member] LTI Plan for 2017 [Member] Adjusted Threshold [Member] Adjusted Target [Member] Original Maximum [Member] Adjusted Maximum [Member] LTI Plan for 2018 [Member] Stretch [Member] Restricted Stock [Member] Loan To Employee Stock Ownership Plan Trust [Member] New Stock-Based Compensation Plan ("RSA Plan") [Member] Time Based Shares [Member] Performance Shares [Member] Award, Tranche One [Member] Award, Tranche Two [Member] Restricted Stock Award Plan [Member] Defined Benefit Plan By Plan Asset Categories [Axis] Fixed Income [Member] Large U.S. Equity [Member] International Equity [Member] Small/Mid U.S. Equity [Member] Balanced/Asset Allocation [Member] NAV - Fair Value [Member] Pension Plan [Member] Balance Sheet Location [Axis] Other Liabilities [Member] Derivative Instrument [Axis] Interest Rate Swap Agreement [Member] Hedging Designation [Axis] Designated as Hedging Instrument [Member] Interest Rate Swap [Member] Hedging Relationship [Axis] Derivatives Designated As Cash Flow Hedges [Member] Terminated Foward Starting Interest Rate Swap [Member] Consolidated Entities [Axis] Bank [Member] Income Tax Authority [Axis] Federal Income Tax [Member] Products and Services [Axis] Unused Lines of Credit [Member] Loan Commitments [Member] Existing Construction Loan Agreements [Member] Loss Contingency Nature [Axis] Standby Letters of Credit [Member] Type of Arrangement and Non-arrangement Transactions [Axis] Risk Participation Agreements [Member] Risk Participation Agreements Two [Member] Related Party [Axis] Small Business Investment Company [Member] Other Assets [Member] Measurement Frequency [Axis] Recurring [Member] Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Level 1 [Member] Fair Value Level 2 [Member] Nonrecurring [Member] Fair Value Inputs Level 3 [Member] Impaired Loans [Member] Measurement Basis [Axis] Carrying Value [Member] Fair Value Level 3 [Member] Parent Company [Member] Common Stock [Member] Additional Paid-In Capital [Member] Unearned Compensation-ESOP [Member] Unearned Compensation-Equity Incentive Plan [Member] Retained Earnings [Member] Accumulated Other Comprehensive Loss [Member] Securities or Other Assets Sold under Agreements to Repurchase [Axis] Collateralized Government-sponsored enterprise obligations [Member] Document And Entity Information Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Well Known Seasoned Issuer Entity Voluntary Filers Entity's Reporting Status Current Entity Emerging Growth Company Entity Small Business Entity Shell Company Entity Filer Category Entity Public Float Share price Entity Common Stock, Shares Outstanding Document Fiscal Period Focus Document Fiscal Year Focus Statement of Financial Position [Abstract] ASSETS Cash and due from banks Federal Funds Sold Interest-bearing deposits and other short-term investments Cash and cash equivalents Securities available-for-sale, at fair value Marketable equity securities, at fair value Federal Home Loan Bank stock and other restricted stock , at cost Loans, net of allowance for loan losses of $12,053 and $10,831 at December 31, 2018 and 2017, respectively Premises and equipment, net Accrued interest receivable Bank-owned life insurance Deferred tax asset, net Goodwill Core deposit intangible Other real estate owned Other assets Total Assets LIABILITIES AND SHAREHOLDERS' EQUITY LIABILITIES: Deposits: Non-interest-bearing Interest-bearing Total deposits Short-term borrowings Long-term debt Securities pending settlement Other liabilities Total liabilities SHAREHOLDERS' EQUITY: Preferred stock - $0.01 par value, 5,000,000 shares authorized, none outstanding at December 31, 2018 and December 31, 2017 Common stock - $0.01 par value, 75,000,000 shares authorized, 28,393,348 shares issued and outstanding at December 31, 2018; 30,487,309 shares issued and outstanding at December 31, 2017 Additional paid-in capital Unearned compensation - ESOP Unearned compensation - Equity Incentive Plan Retained earnings Accumulated other comprehensive loss TOTAL SHAREHOLDERS' EQUITY: TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY Allowance for loan losses Preferred stock, par value (in dollars per share) Preferred stock, authorized Common stock, par value (in dollars per share) Common stock, authorized Common stock, issued Common stock, outstanding Income Statement [Abstract] Interest and dividend income: Residential and commercial real estate loans Commercial and industrial loans Consumer loans Debt securities, taxable Debt securities, tax-exempt Equity securities Other investments Short-term investments Total interest and dividend income INTEREST EXPENSE: Deposits Long-term debt Short-term borrowings Total interest expense Net interest and dividend income Provision for loan losses Net interest and dividend income after provision for loan losses Non-interest income (loss): Service charges and fees Income from BOLI Loss on prepayment of borrowings Gain on bank-owned life insurance death benefit (Loss) gain on available-for-sale securities, net Gain on sale of OREO Unrealized losses on marketable equity securities Other income Total non-interest income Non-interest expense: Salaries and employees benefits Occupancy Furniture and equipment Data processing Professional fees FDIC insurance assessment Merger related expenses Advertising Other expenses Total non-interest expense Income before income taxes Income tax provision Net income Earnings per common share: Basic earnings per share (in dollars per share) Weighted average shares outstanding (in shares) Diluted earnings per share (in dollars per share) Weighted average diluted shares outstanding (in shares) Statement of Comprehensive Income [Abstract] Net income Other comprehensive income (loss): Unrealized (losses) gains on securities: Unrealized holding (losses) gains on available-for-sale securities Reclassification adjustment for net losses (gains) realized in income Amortization of net unrealized loss on held-to-maturity securities Net unrealized loss upon transfer of held-to-maturity to available for sale Unrealized (losses) gains on securities Tax effect Net-of-tax amount Cash flow hedges: Change in fair value of derivatives used for cash flow hedges Reclassification adjustment for loss realized in interest expense Reclassification adjustment for termination fee realized in interest expense Unrealized gains on cash flow hedges Tax effect Net-of-tax amount Defined benefit pension plan: Gains (losses) arising during the period Amortization of defined benefit plans actuarial loss Unrecognized actuarial gains (losses) defined benefit plan Tax effect Net-of-tax amount Other comprehensive (loss) income Comprehensive income Income tax benefits on realized losses on available-for-sale securities Income tax expense (benefits) on amortization of net unrealized (gain) loss on held-to-maturity securities Income tax expense (benefits) on net unrealized (loss) gain upon transfer of held-to-maturity to available-for-sale Income tax benefit on derivative instruments Income tax benefit on termination fee on derivative instruments Income tax benefit, defined benefit plans Statement [Table] Statement [Line Items] BALANCE AT BEGINNING BALANCE AT BEGINNING (shares) Cumulative-effect adjustment due to change in accounting principle Comprehensive income Common stock held by ESOP committed to be released Share-based compensation - equity incentive plan Excess tax benefit from equity incentive plan Acquisition of Chicopee Bancorp Acquisition of Chicopee Bancorp (in shares) Retirement of Chicopee Bancorp ESOP Retirement of Chicopee Bancorp ESOP (in shares) Premium to equity for rollover of Chicopee Bancorp options Retirement of WNEB stock previously owned by Chicopee Bancorp Retirement of WNEB stock previously owned by Chicopee Bancorp (in shares) Common stock repurchased Common stock repurchased (in shares) Issuance of common stock in connection with stock option exercises Issuance of common stock in connection with stock option exercises (shares) Issuance of common stock in connection with equity incentive plan Issuance of common stock in connection with equity incentive plan (shares) Excess tax benefits in connection with stock option exercises Cash dividends declared and paid BALANCE AT ENDING BALANCE AT ENDING (shares) Statement of Stockholders' Equity [Abstract] Common stock held by ESOP committed to be released (shares) Cash dividends declared (per share) Statement of Cash Flows [Abstract] OPERATING ACTIVITIES: Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization of premises and equipment Accretion of purchase accounting adjustments, net Amortization of core deposit intangible Net amortization of premiums and discounts on securities and mortgage loans Net amortization of premiums on modified debt Share-based compensation expense ESOP expense Excess tax benefits from equity incentive plan Excess tax benefits in connection with stock option exercises Change in unrealized loss on equity securities Net loss (gain) on sales of securities Net gain on sales of other real estate owned Loss on prepayment of borrowings Deferred income tax (benefit) expense Income from bank-owned life insurance Gain on bank-owned life insurance death benefit Net change in: Accrued interest receivable Other assets Other liabilities Net cash provided by operating activities INVESTING ACTIVITIES: Securities, held-to-maturity: Proceeds from calls, maturities, and principal collections Securities, available-for-sale: Purchases Proceeds from sales Proceeds from calls, maturities, and principal collections Purchase of residential mortgages Loan originations and principal payments, net Net cash acquired from acquisition of Chicopee Bancorp Redemption of Federal Home Loan Bank of Boston stock Proceeds from sale of other real estate owned Purchases of premises and equipment Proceeds from sale of premises and equipment Proceeds from payout on bank-owned life insurance Net cash (used in) provided by investing activities FINANCING ACTIVITIES: Net increase (decrease) in deposits Net change in short-term borrowings Repayment of long-term debt Proceeds from long-term debt Cash dividends paid Common stock repurchased Issuance of common stock in connection with stock option exercises Excess tax benefits from equity incentive plan Excess tax benefits in connection with stock option exercises Net cash provided by (used in) financing activities NET CHANGE IN CASH AND CASH EQUIVALENTS: Beginning of year End of year Supplemental cash flow information: Securities reclassified from held-to-maturity to available-for-sale Net change in due to broker for common stock repurchased Loans transferred to other real estate owned In connection with the purchase acquisition detailed in Note 1 to the audited consolidated financial statements: Fair value of non-cash assets acquired Goodwill and core deposit intangibles Fair value of liabilities assumed Value of common shares issued Accounting Policies [Abstract] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Investments, Debt and Equity Securities [Abstract] INVESTMENT SECURITIES Receivables [Abstract] LOANS Property, Plant and Equipment [Abstract] PREMISES AND EQUIPMENT Goodwill and Intangible Assets Disclosure [Abstract] GOODWILL AND OTHER INTANGIBLES Banking and Thrift [Abstract] DEPOSITS Debt Disclosure [Abstract] SHORT-TERM BORROWINGS LONG-TERM DEBT Disclosure of Compensation Related Costs, Share-based Payments [Abstract] STOCK PLANS AND EMPLOYEE STOCK OWNERSHIP PLAN Defined Benefit Plan [Abstract] RETIREMENT PLANS AND EMPLOYEE BENEFITS Derivative Instruments and Hedging Activities Disclosure [Abstract] DERIVATIVES AND HEDGING ACTIVITIES REGULATORY CAPITAL Income Tax Disclosure [Abstract] INCOME TAXES Related Party Transactions [Abstract] TRANSACTIONS WITH DIRECTORS AND EXECUTIVE OFFICERS Commitments and Contingencies Disclosure [Abstract] COMMITMENTS AND CONTINGENCIES Fair Value Disclosures [Abstract] FAIR VALUE OF ASSETS AND LIABILITIES Segment Reporting [Abstract] SEGMENT Condensed Financial Information Disclosure [Abstract] CONDENSED PARENT COMPANY FINANCIAL STATEMENTS Quarterly Financial Information Disclosure [Abstract] SUMMARY OF QUARTERLY FINANCIAL INFORMATION (UNAUDITED) Subsequent Events [Abstract] SUBSEQUENT EVENTS Nature of Operations and Basis of Presentation Wholly-owned Subsidiaries and Acquisition Principles of Consolidation Estimates Reclassifications Significant Group Concentrations of Credit Risk Cash and Cash Equivalents Securities and Mortgage-Backed Securities Derivatives Other-than-Temporary Impairment of Securities Fair Value Hierarchy Federal Home Loan Bank of Boston Stock Loans Held for Sale Loans Receivable Allowance for Loan Losses Loans Acquired with Deteriorated Credit Quality Bank-owned Life Insurance Transfers and Servicing of Financial Assets Premises and Equipment Other Real Estate Owned Servicing Impairment of Long-lived Assets Retirement Plans and Employee Benefits Share-based Compensation Plans Employee Stock Ownership Plan Advertising Costs Income Taxes Earnings per Share Comprehensive Income (Loss) Recent Accounting Pronouncements Schedule of estimated useful lives of the assets Schedule of earnings per common share Schedule of accumulated other comprehensive loss included sharesholders equity Schedule of changes in accumulated other loss by component Schedule of securities available for sale Schedule of amortized cost and fair value of securities available for sale by maturity Schedule of gross realized gains and losses on sales of securities available for sale Schedule of securities with gross unrealized losses in continuous loss position Schedule of loans Schedule of mortgage servicing rights Schedule of analysis of changes in allowance for loan losses by segment Schedule of information pertaining to the allowance for loan losses by segment Schedule of past due and nonaccrual loans by class Schedule of impaired loans by class Schedule of loans acquired with deteriorated credit quality Schedule of loans by risk rating Schedule of premises and equipment Schedule of of deposit accounts by type Scheduled maturities of time certificates of deposit Schedule of interest expense on deposits Schedule of information regarding repurchase agreements Schedule of advances collateralized by lien Schedule of stock option activity Schedule of original and adjusted threshold and target metrics Schedule of stock award plan activity Schedule of the remaining principal balance payable Schedule of shares held by ESOP Schedule of information for plan Schedule of actuarial assumptions used in determining the pension benefit obligation Schedule of net pension benefit costs Schedule of actuarial assumptions used in determining the service costs Schedule of investments of pension plan assets Schedule of investments for which fair value measured using NAV for pension plan assets Schedule of estimated benefits to be paid from the pension plan Schedule of fair values of derivative financial instruments Schedule of information about cash flow hedges Schedule of pre-tax net losses of cash flow hedges Schedule of actual capital ratios Schedule of reconciliation of capital to regulatory Tier 1, Common Equity Tier 1 and total capital Schedule of income taxes Schedule of differences between statutory federal income tax rate and effective rates Schedule of deferred taxes Schedule of activity for loans - directors and executive officers Schedule of financial instruments and other commitments and contingent liabilities Schedule of aggregate future minimum rental payments Schedule of assets and liabilities measured at fair value on recurring basis Schedule of assets measured at fair value on non-recurring basis Schedule of estimated fair values of financial instruments Schedule of condensed balance sheets Schedule of condensed statements of income Schedule of condensed statements of cash flows Summary of quarterly financial information Property, Plant and Equipment, Type [Axis] Estimated useful lives Net income applicable to common stock Average number of common shares issued Less: Average unallocated ESOP Shares Less: Average unvested equity incentive plan shares Average number of common shares outstanding used to calculate basic earnings per common share Effect of dilutive equity incentive plan Effect of dilutive stock options Average number of common shares outstanding used to calculate diluted earnings per common share Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Line Items] Fair value of derivatives used for cash flow hegdes Derivative Termination fee on cancelled cash flow hedges Accumulated other comprehensive income (loss) before tax Tax effect Accumulated other comprehensive income (loss), net of tax amount Beginning balance Cumulative-effect adjustment due to change in accounting principle Current-period other comprehensive (loss) income Ending balance Number of banking offices in which bank operates Number of shares issued (in shares) Maximum percentage of participant's annual earnings subject to match by employer for 401(K) plan Employer matching contribution for the first 6% of each participant's annual earnings Actuarial loss expected to be recognized in net periodic pension costs in 2019 Future lease payments outstanding Transaction cost Total assets Total deposits Total loans Increase in assets due to adoption of new accounting standard Increase in liabilities due to adoption of new accounting standard Debt securities of adoption new accounting standard Schedule of Investments [Table] Schedule of Investments [Line Items] Available-for-sale securities: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Available for Sale Securities, Amortized Cost, Due in one year or less Available for Sale Securities, Amortized Cost, Due after one year through five years Available for Sale Securities, Amortized Cost, Due after five years through ten years Available for Sale Securities, Amortized Cost, Due after ten years Available for Sale Securities, Amortized Cost, Total Available for Sale Securities, Fair Value, Due in one year or less Available for Sale Securities, Fair Value, Due after one year through five years Available for Sale Securities, Fair Value, Due after five years through ten years Available for Sale Securities, Fair Value, Due after ten years Available for Sale Securities, Fair Value, Total Gross gains realized Gross losses realized Net gain realized Available for sale, Less Than 12 Months Gross Unrealized Losses Available for sale, Less Than 12 Months Fair Value Available for sale, Over 12 Months Gross Unrealized Losses Available for sale, Over 12 Months Fair Value Number of Securities - less than 12 months Gross Loss - less than 12 months Depreciation from Amortized Cost Basis (%) - less than 12 months Number of Securities - Over 12 Months Gross Loss - Over 12 Months Depreciation from Amortized Cost Basis (%) - Over 12 months Fair value of collateralized public deposits Cumulative-effect adjustment due to change in accounting principle (ASU 2016-01) Proceeds from redemptions and sales Investments in restricted stock Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts, Notes, Loans and Financing Receivable [Line Items] Class of Financing Receivable, Type [Axis] Total gross loans Premiums and deferred loan fees and costs, net Allowance for loan losses Net loans Servicing Asset Balance at the beginning of period: Capitalized mortgage servicing rights Amortization Balance at the end of year Fair value at the end of year Beginning Balance Provision (credit) Charge-offs Recoveries Ending Balance Schedule of Financing Receivable, Allowance for Credit Losses [Table] Amount of allowance for impaired loans Amount of allowance for non-impaired loans Total allowance for loan losses Impaired loans Non-impaired loans Impaired loans acquired with deteriorated credit quality Total loans Schedule of Financing Receivables Past Due [Table] Total Past Due Total Current Loans Non-Accrual Loans Schedule of Impaired Financing Receivable [Table] Financing Receivable, Impaired [Line Items] Total Impaired loans: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized Loans receivable - Contractual Required Payments Receivable beginning Collections - Contractually Required Payments Receivable Dispositions - Contractually Required Payments Receivable Loans receivable - Contractual Required Payments Receivable ending Loans receivable - Cash Expected To Be Collected beginning Collections - Cash Expected to be Collected Dispositions - Cash Expected to be Collected Loans receivable - Cash Expected To Be Collected ending Loans receivable - Non-Accretable Discount beginning Collections - Non-Accretable DIscount Dispositions - Non-Accretable Discount Loans receivable - Non-Accretable Discount ending Loans receivable - Accretable Yield beginning Collections - Accretable Yield Dispositions - Accretable Yield Loans receivable - Accretable Yield ending Loans receivable - Outstanding beginning Collections Dispositions Loans receivable - Outstanding ending Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Financing Receivable, Recorded Investment [Line Items] Loans Purchase of residential mortgages Serviced commercial loans for participants Mortgage loans serviced for others Net service fee income Weighted average internal rate of return Weighted average servicing fee Net cost to service loans TDR Charge offs Loan modified to extend the maturity and re-amortize the payments Percentage of non-accrual loans Property, Plant and Equipment [Table] Property, Plant and Equipment [Line Items] Legal Entity [Axis] Premises and equipment, gross Less: accumulated depreciation and amortization Depreciation and amortization expense Acquired deposit liabilities Acquired core deposit liabilities Future amortization of core deposit intangible assets years 1-5 Future amortization of core deposit intangible assets thereafter Demand and interest-bearing checking: Interest-bearing checking accounts Demand deposits Savings: Regular accounts Money market accounts Time deposits Time certificates of deposit, rate Total deposits Maturities of time certificates of deposit 2018 2019 2020 2021 2022 2023 Total time deposits Interest expense on deposits: Regular Money market Time Interest-bearing checking accounts Total Time deposits over $250,000 or more Interest expense on time deposits $250,000 or more Cash paid for interest on deposits Brokered deposits Customer Repurchase Agreements Balance outstanding at year end Maximum amount outstanding during year Average amount outstanding during year Weighted average interest rate at end of year Amortized cost of collateral pledged at end of year Fair value of collateral pledged at end of year Line of credit available Required cash reserve amount Fair value collateral of repurchase agreements Customer repurchase agreements Weighted average rate Short-term borrowings Schedule Of Federal Home Loan Bank Advances And Other Borrowings [Table] Schedule Of Federal Home Loan Bank Advances And Other Borrowings [Line Items] Long-term Debt, Type [Axis] Fixed-rate advances maturing: Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Total fixed rate advances Variable-rate maturing Year 1 Weighted average rate Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Advances, weighted average rate Schedule of Long-term Debt Instruments [Table] Debt Instrument [Line Items] Cash paid for interest Options, Outstanding Outstanding at beginning of period Exercised Outstanding at end of period Exercisable at end of period Options, Outstanding, Weighted Average Exercise Price Outstanding at beginning of period Exercised Outstanding at end of period Exercisable at end of period Options, Outstanding, Weighted Average Remaining Contractual Term (in years) Outstanding at beginning of period Exercised Outstanding at end of period Exercisable at end of period Options, Outstanding, Aggregate Intrinsic Value Outstanding at beginning of period Exercised Outstanding at end of period Exercisable at end of period December 31, 2018 December 31, 2019 December 31, 2020 Original metrics Adjusted metrics Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Restricted Stock Awards Beginning balance Shares granted Shares vested Shares forfeited Ending balance Weighted Average Grant Date Fair Value Beginning balance Shares granted Shares vested Shares forfeited Ending balance Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] 2019 2020 2021 2022 2023 Thereafter ESOP Loan Allocated Committed to be allocated Unallocated Total Stock Options Cash received for options exercised Restricted Stock Awards Shares authorized Share-based compensation expense Share based compensation, shares available for grant Vesting term Percent of awards under plan Percent of awards participants may earn Fair value of restricted stock vested Employee Stock Owneship Plan Employee age required to qualify for ESOP benefit Minimum working hours needed for eligibility Purchase of common stock by ESOP Trust of IPO, percent Purchase of common stock by ESOP Trust of IPO Number of shares sold in IPO Debt, interest rate Total ESOP compensation expense Fair value of unallocated ESOP shares Change in benefit obligation: Benefit obligation at beginning of year Service cost Interest Actuarial (gain) loss Benefits paid Benefit obligation at end of year Change in plan assets: Balance at beginning of year Actual (loss) return on plan assets Employer contribution Benefits paid Balance at end of year Funded status and accrued benefit at end of year Accumulated benefit obligation at end of year Discount rate Rate of compensation increase Interest cost Expected return on assets Amortization of actuarial loss Net periodic pension cost Service Costs Assumptions Discount rate Expected return on plan assets Rate of compensation increase Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan, Plan Assets, Category [Axis] Define benefit plan fair value of plan asset Fair Value Unfunded Commitments Redemption Frequency (if Currently Eligible) Redemption Notice Period 2019 2020 2021 2022 2023 In aggregate for 2024 - 2028 Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Minimum working hours needed for eligibility Defined benefit plan target plan asset allocations Employer contribution to plan Fair value of derivative assets Fair value of derivative liability Notional Amount Weighted Average Maturity Weighted Average Rate Received Weighted Average Rate Paid Estimated Fair Value Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion) Derivative notional amount Estimated amount to be reclassified during the next 12 month period Reclassifications amount, effective portion Termination value of derivatives in a net liability position Fair value of mortgage backed securities collateralized Termination fees Termination fees amortized period Cash posted as collateral Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Total Capital (to Risk Weighted Assets): Total Capital Total Capital (to risk-weighted assets) ratio Minimum amount of capital for adequacy purposes Minimum amount of capital for adequacy purposes, ratio Minimum Capital required to be well-capitalized Minimum Capital required to be well-capitalized, ratio Tier 1 Capital (to Risk Weighted Assets): Tier 1 Capital Tier 1 Capital (to risk-weighted assets) ratio Minimum amount of Tier 1 Capital for adequacy purposes Minimum amount of Tier 1 Capital for adequacy purposes, ratio Minimum Tier 1 Capital required to be well-capitalized Minimum Tier 1 Capital required to be well-capitalized, ratio Common Equity Tier 1 Capital (to risk-weighted assets) Common Equity Tier 1 Capital Common Equity Tier 1 Capital (to risk-weighted assets) ratio Minimum amount of Common Equity Tier 1 Capital for adequacy purposes Minimum amount of Common Equity Tier 1 Capital for adequacy purposes, ratio Minimum Common Equity Tier 1 Capital required to be well-capitalized Minimum Common Equity Tier 1 Capital required to be well-capitalized, ratio Tier 1 Leverage Ratio (to Adjusted Average Assets): Tier 1 Leverage ratio Tier 1 Leverage (to adjusted average assets) ratio Minimum amount of Tier 1 Leverage for adequacy purposes Minimum amount of Tier 1 Leverage for adequacy purposes, ratio Minimum Tier 1 Capital required to be well-capitalized Minimum Tier 1 Leverage required to be well-capitalized, ratio Consolidated GAAP capital Net unrealized losses on available-for-sale securities, net of tax Unrealized loss on defined benefit pension plan, net of tax Accumulated net loss on cash flow hedges, net of tax Unrealized loss on certain available-for-sale equity securities Goodwill Intangible assets, net of associated deferred tax liabilities Tier 1 and Common Equity Tier 1 capital Allowance for loan losses Total regulatory capital Number of shares authorized to be repurchased Number of shares authorized to be repurchased as percentage of total outstanding shares of common stock Restricted equity in net assets Capital converservation buffer of Common Equity Tier 1 Capital ratio Percentage of initial phase-in amount Current tax provision: Federal State Total Deferred tax (benefit) provision: Federal State Change in valuation reserve Total Total Statutory federal income tax rate Increase (decrease) resulting from: State taxes, net of federal tax benefit Tax exempt income Bank-owned life insurance (BOLI) Nondeductible merger expenses Change in valuation reserve Option exercise tax benefit Effect of tax rate change Other, net Effective tax rate Deferred tax assets: Allowance for loan losses Net unrealized loss on derivative and hedging activity Employee benefit and share-based compensation plans Defined benefit plan Net unrealized loss on securities available for sale Other-than-temporary impairment write-down Purchased mortgage servicing rights Nonaccrual interest Other Gross deferred tax assets Deferred tax liabilities: Deferred loan fees Hedge termination payments Purchase accounting adjustments, net Other Gross deferred tax liabilities Net deferred tax asset Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Line Items] Cash paid for income taxes Income tax reserve for loan losses at Bank's base year Percentage of amount actually used net of reserve subject to taxation Deferred tax liability not recognized Operating loss carryforwards Additional income tax expense Additional income tax benefit Loans and Leases Receivable, Related Parties [Roll Forward] Balance at beginning of year Principal distributions Repayments of principal Balance at end of year Loss Contingencies [Table] Loss Contingencies [Line Items] Product and Service [Axis] Commitments to extend credit 2019 2020 2021 2022 2023 Thereafter Total Contract term Risk participation agreement term Risk Participation agreement - fair value Estimated risk participation agreement maximum exposure Commitments to extend credit Fixed rate commitments Fixed rate commitments - interest rates Variable rate commitments Rent expense under operating leases Partners committed capital contrbution Partners committed book value Unfunded commitment Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Hierarchy and NAV [Axis] Available for sale securities Marketable equity securities Mutual funds Interest rate swaps - Assets Total assets Interest rate swaps - Liabilities Total losses Impaired loans Fair Value, by Balance Sheet Grouping [Table] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Assets: Cash and cash equivalents Securities available-for-sale Federal Home Loan Bank of Boston and other restricted stock Loans - net Accrued interest receivable Mortgage servicing rights Liabilities: Deposits Short-term borrowings Long-term debt Accrued interest payable Derivative liabilities Condensed Financial Statements [Table] Condensed Financial Statements, Captions [Line Items] ASSETS: Cash equivalents Investment in subsidiaries ESOP loan receivable ESOP loan payable EQUITY TOTAL LIABILITIES AND EQUITY INCOME: Dividends from subsidiaries Interest income from securities ESOP loan interest income Gain on sales of securities, net Other income Total income OPERATING EXPENSE: Salaries and employee benefits ESOP interest Other expenses Total operating expense Income before equity in undistributed income of subsidiaries and income taxes Equity in undistributed (loss) income of subsidiaries Net income before taxes Income tax benefit Equity in undistributed loss (income) of subsidiaries Gain on sales of securities, net Change in other liabilities Change in other assets Other, net Purchase of securities Sales of securities Excess tax benefit from share-based compensation NET CHANGE IN CASH AND CASH EQUIVALENTS CASH AND CASH EQUIVALENTS Beginning of year End of year Supplemental cash flow information: Net change in cash due to broker for common stock repurchased Interest and dividend income Interest expense Provision for loan losses Gain (loss) on disposal of other real estate owned Gain (loss) on sales of securities, net Unrealized (losses) gains on marketable equity securities Swap fee income Bank-owned life insurance death benefit Other non-interest income Non-interest income Non-interest expense Income before income taxes Net income (loss) Shares repurchased under plan Average repurchase price Decrease in shareholders' equity Number of shares effect of dilutive equity incentive plan. Amount before tax of increase (decrease) in accumulated equity from fair value of derivatives used from cash flow hedges. Amount before tax of increase (decrease) in accumulated equity from fees for termination of swap agreement. Amount of the reclassification adjustment to AOCI, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. Information related to Massachusetts and Granb. Information related to Chicopee Bancorp, Inc. (“Chicopee”), the holding company for Chicopee Savings Bank. A defined benefit pension plan defines an amount of pension benefit to be provided to a retiree (or beneficiary), usually as a function of one or more factors such as age, years of service, or compensation. Any pension plan that is not a defined contribution pension plan is a defined benefit pension plan. Number of branches the bank operates by location. It represents the information related to maximum four zero OneK Plan contribution rates as percentage of employees earnings. The amount of increase in assets due to adoption of new accounting standard. The amount of Increase in liabilities due to adoption of new accounting standard. The amount represent debt securities of adoption new accounting standard. Tangible personal property used to produce goods and services. Represents the state and municipal bonds. Represents the government sponsored mortagage back securities. Regulated investment instrument that pools funds from multiple investors to invest principally in a portfolio of securities and money market instruments to match the investment objective. It represents the number of securities, continuous unrealized loss position less than twelve months. It represents the amount of securities, continuous unrealized loss position, less than twelve months, aggregate loss. It represents the amount of available for sale securities, continuous unrealized loss position, less than twelve months, depreciation from amortized cost percentage. It represents the number of securities, continuous unrealized loss position more than twelve months. Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Aggregate Loss Available for Sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Depreciation from Amortized Cost Percentage The fair value of available for sales securities pledged to secure public deposits. Sector of the economy consisting of companies engaged in commercial and industrial business activities. Information related to unallocaetd. It represents the amount of allowance for loans acquired with deteriorated credit quality. It represents the amount of loans acquired with deteriorated credity quality. The collections from loans (contractually required payments) acquired with deteriorated credit quality, The collections from loans (cash flows expected to be collected) acquired with deteriorated credit quality, The dispositions of loans (cash flows expected to be collected) acquired with deteriorated credit quality, Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans with evidence of deterioration of credit quality. The collections from loans (non-accreditable yeld) acquired with deteriorated credit quality, The dispositions of loans (non-accreditable yeld) acquired with deteriorated credit quality, The collections from loans (accreditable yeld) acquired with deteriorated credit quality, The dispositions of loans (accreditable yeld) acquired with deteriorated credit quality, The collections from loans acquired with deteriorated credit quality, The dispositions of loans acquired with deteriorated credit quality, Commercial loans serviced for participants at period end. Third party mortgage loans serviced at period end. It represents the percentage of weighted average interest rate of return. It represents the amount of percentage for weighted average servicing fee. Amount of net cost to service loans per loan. Amount of deposit liabilities assumed at the acquisition date. Amount of core deposit liabilities assumed at the acquisition date. Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized for each of the next five years. Information related to deposit liabilities. Information related to deposit liabilities. Interes tExpense Foreign Deposit Liabilities Interest Bearing. The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $250,000 or more. Interest expense on time deposits $250,000 or more The amount of cash paid for interest on deposits during the period. Repurchase Agreements, Maximum Outstanding at Any Month End Repurchase Agreements, Average Outstanding Balance Represents the bank member. Represents the bank. Schedule of Federal Home Loan Bank Advances and Other Borrowings [Table] Schedule of Federal Home Loan Bank Advances and Other Borrowings [Line Items] Borrowings from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and also in times of liquidity shortages. The member institution executes a promissory note, which is generally collateralized by government securities to the Federal Reserve or loans. Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the sixth fiscal year following the latest fiscal year. The weighted average interest rate applicable to the Federal Home Loan Bank advances which are due from five to six years of the Balance Sheet date. Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate Weighted average remaining contractual term for option awards exercise, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. It refers to weighted average remaining contractual term, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Name of the equity-based compensation arrangement plan. It represents threshold member. It represents target member. Name of the equity-based compensation arrangement plan. Information by vesting schedule for share-based compensation. Information by vesting schedule for share-based compensation. Information by range, including, but not limited to, upper and lower bounds. Name of the equity-based compensation arrangement plan. It represents stretch member. Percent of performance stock awards participants will be able to earn during the current performance year. Percent of performance stock awards participants will be able to earn during the next performance year. Percent of performance stock awards participants will be able to earn during the third performance year. Return on equity original performance metrics used in determining grant of shares under LTI plan before the Tax Cuts and Jobs Act of 2017. Return on equity adjusted performance metrics used in determining grant of shares under LTI plan as a result of the Tax Cuts and Jobs Act of 2017. Loan to Employee Stock Ownership Plan Trust [Member] The amount of the loan made by the Bank directly to the ESOP. Represents the time based. It represents the percentage of grants under incentive program. Percent of performance stock awards participants will be able to earn during the performance period. Employee Stock Ownership Plan Employee Eligibility Age The number of hours to meet minimum requirement for eligibility. Employee Stock Ownership Plan (ESOP) Shares Acquired Initial Public Offering Percentage Number of shares purchased by ESOP from IPO. Number of shares sold in IPO. Information related to fixed income. Information related to United States large cap equity. Information related to international equity. Information related to US small mid cap equity. Information related to actual asset allocation. Fair value of plan assets measured using NAV per share. Minimum Eligible Service Period Interest Rate Swap Agreement [Member] Represents the interest rate swap. Refers to amount of derivative instrument termination fees. Represents the termination fees amortized period. Common Equity Tier 1 Risk Based Capital as defined in the regulations. Common Equity Tier 1 capital divided by risk weighted assets as defined by regulations. The minimum amount of Common Equity Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. The minimum Common Equity Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. The Tier 1 capital amount (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. Adjustment amount for unrealized loss on investments in equity securities classified as available-for-sale, net of tax. Adjustment amount for unrealized loss on defined benefit pension plan, net of tax. Adjustment amount forAccumulated Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives. Represents the amount of unrealized loss on certain available-for-sale equity securities. Adjustment amount for intangible assets net of associated deferred tax liabilities. Percentage of Common Equity Percent of common equity Tier 1 capital in an amount greater than total risk weighted assets as capital conservation buffer. Represents the percentage of initial phase in amount. It represents the amount of deferred income tax expense benefit change in valuation reserve. Amount of deferred tax liability attributable to taxable hedge termination payments. Amount of deferred tax liability attributable to taxable net of purchase accounting adjustments. Percentage of reserve amount actually used other than to absord loan losses, limited to the amount of reserves, subject to taxation. Amount of additional income tax expense and deferred income tax expense benefit pertaining to continuing operations. Amount of additional income tax expense and deferred income tax benefit pertaining to continuing operations. Information by products and services or groups of similar products and services. Information by products and services or groups of similar products and services. Information by products and services or groups of similar products and services. Information by category of arrangement. Information by category of arrangement. Term of the risk participation agreement. Fair value portion of risk participation agreement. It represents the amount of commitment to extend credit. It represents the commitments to extend credit fixed interest rate. The amount of committed capital contribution to limited partnership. It represents the value of partners committed book value. The amount refers to unfunded commitment. Information related to impaired loans. Fair value portion of impaired loans receivable, It represents the amount of accrued investment income receivable fair value disclosure. Fair value of an mortgage servicing rights representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. Interest Payable, Fair Value Disclosure Loans Receivable Dividends paid to and received by the parent company from the bank subsidiary. Equity in undistributed income of subsidiaries for the parent during the period. Dividends in Excess of Earnings of Subsidiaries Amounts payable related to common stock repurchased The amount refers to bank owned life insurance death benefit. Interest income on federal funds sold. Federal funds sold represent the excess federal funds held by one commercial bank which it lends to another commercial bank, usually at an agreed-upon (federal funds) rate of interest. Such loans are made for legal reserve requirement purposes of the borrowing bank and generally are of short-duration (overnight). Also include interest income on other investments not otherwise specified in the taxonomy that will be realized in a short period of time, usually less than one year or the normal operating cycle, whichever is longer. The amount refers to service charges and fees. The amount refers to other comprehensive income loss amortization of net unrealized loss on held. Amount before tax of reclassification adjustment for Termination fee from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss). Income tax benefit on termination fee on derivative instruments It refers to amount of net accretion of purchase accounting adjustments during the period. Amount of excess tax benefits in connection with stock option exercises. The amount of bank owned life insurance death benefits. Cash inflow (outflow) related to a loan originations and principal payments, net. The amount of process from payout on bank owned life insurance. Amount of cash flow from excess tax benefits (expense) from equity incentive plan. The amount refers to securities reclassified from held to maturity to available for sale. The amount of net change in cash due to broker for common stock repurchased. Amount of goodwill and core deposit intangibles. Mortgage Backed Securities Policy. Other-Than-Temporary Impairment, Policy. Federal Home Loan Bank Stock. Bank-Owned Life Insurance. Tabulur disclosure related to estimated useful lives of the assets. Schedule of information related to the allowance for loan losses by segment. Schedule of Deposits. Schedule of Maturities of Time Deposits. Schedule of Interest Expense on Deposits. Advances from Federal Home Loan Bank and Other Borrowings Maturities. Schedule of original and adjusted threshold and target metrics under the LTI Plans. Summary of assumptions (including assumed discount rates, rates of compensation increase, and expected long-term rates of return on plan assets) used to calculate the benefit obligation. Summary of the amount of net periodic benefit cost for defined benefit plans for the period. Summary of assumptions used to calculate service cost. Tabular disclosure of fair value of plan assets. Schedule for fair value of plan investments for which fair value is measured using NAV per share as a practical expedient. Schedule of the amount of benefits from a defined benefit plan expected to be paid from latest balance sheet date. Reconciliation of Stockholders' Equity to Regulatory Capital. The entire disclosure for commitments. Represents the pass. Represents the special member. Represents the substandard. The member represent employee stock ownership plan esop plan member. It represent the acquisition of chicopee bancorp. Number of shares acquisition of chicopee bancorp in shares. It represent the retirement of chicopee bancorp escop. Number of shares retirement of chicopee bancorp escop. It represent the premium to equity for rollover of chicopee bancorp options. It rerpresent the retirment of wneb stock previously owen by chicopee bancorp. Number of shares retirement of wneb stock previously owen by chicopee bancorp in. The entity percentage of nonaccrual loans. Information by restricted stock award plan. Information by us government sponsored enterpreises debt securities. The average share price of the repurchased stock. The dispositions of loans (cash flows required payments) acquired with deteriorated credit quality, Debt Security, Corporate, US [Member] Bank1Member Cash, Cash Equivalents, and Federal Funds Sold Deposits [Default Label] Liabilities Unearned ESOP Shares Deferred Compensation Equity Interest and Dividend Income, Operating Interest Expense, Long-term Debt Interest Expense, Short-term Borrowings Interest Income (Expense), Net Interest Income (Expense), after Provision for Loan Loss ServiceChargesAndFees Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentForTerminantionFeeFromAOCIOnDerivativesBeforeTax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax Shares, Outstanding Cumulative Effect of New Accounting Principle in Period of Adoption Stock Repurchased During Period, Value Dividends, Common Stock, Cash NetAccretionOfPurchaseAccountingAdjustments ExcessTaxBenefitsInConnectionWithStockOptionExercises Gain (Loss) on Sale of Properties Commercial and Industrial [Member] Increase (Decrease) in Interest and Dividends Receivable Increase (Decrease) in Other Operating Assets Net Cash Provided by (Used in) Operating Activities Payments to Acquire Available-for-sale Securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale PaymentLoanOriginationsAndPrincipalPaymentsNet Payments for (Proceeds from) Federal Home Loan Bank Stock Payments to Acquire Property, Plant, and Equipment Net Cash Provided by (Used in) Investing Activities Repayments of Long-term Debt Payments of Dividends Payments for Repurchase of Common Stock Net Cash Provided by (Used in) Financing Activities Weighted Average Number of Shares, Employee Stock Ownership Plan Shares Not Committed to be Released Weighted Average Number of Shares, Contingently Issuable AOCI Tax, Attributable to Parent Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Available-for-sale Securities, Gross Realized Losses Number Of Securities Continuous Unrealized Loss Position Less Than Twelve Months Number Of Securities Continuous Unrealized Loss Position More Than Twelve Months Servicing Asset at Amortized Cost Servicing Asset at Amortized Cost, Amortization Servicing Asset at Fair Value, Amount Allowance for Loan and Lease Losses, Write-offs Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition CollectionsContractuallyRequiredPaymentsReceivable DispositionsContractuallyRequiredPaymentsReceivable Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition CollectionsCashFlowsExpectedToBeCollected LoansReceivableAtAcquisitionNonaccretableYield CollectionsNonaccretableYield Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield CollectionsAccretableYield Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance CollectionsOnLoansAcquiredWithDeterioratedCreditQuality Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Two Thousand And Fifteen [Member] Short-term Debt Federal Home Loan Bank, Advances, Maturities Summary, Fixed Rate Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate of Amounts Due within One Year of Balance Sheet Date Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, One to Two Years from Balance Sheet Date Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, Two to Three Years from Balance Sheet Date Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, Three to Four Years from Balance Sheet Date Federal Home Loan Bank, Advances, Maturities Summary, Average Interest Rate, Four to Five Years from Balance Sheet Date Schedule Of Federal Home Loan Bank Advances And Other Borrowings [Line Items] [Default Label] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageRemainingContractualTerm2 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months Long-term Debt, Maturities, Repayments of Principal in Year Two Long-term Debt, Maturities, Repayments of Principal in Year Three Long-term Debt, Maturities, Repayments of Principal in Year Four Long-term Debt, Maturities, Repayments of Principal in Year Five Deposit Liabilities [Line Items] Employee Stock Ownership Plan (ESOP), Shares in ESOP Allocated Share-based Compensation Expense Defined Benefit Plan, Benefit Obligation Defined Benefit Plan, Benefit Obligation, Benefits Paid Defined Benefit Plan, Plan Assets, Benefits Paid Defined Benefit Plan, Funded (Unfunded) Status of Plan Defined Benefit Plan, Accumulated Benefit Obligation Defined Benefit Plan, Expected Return (Loss) on Plan Assets Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months Defined Benefit Plan, Expected Future Benefit Payment, Year Two Defined Benefit Plan, Expected Future Benefit Payment, Year Three Defined Benefit Plan, Expected Future Benefit Payment, Year Four Defined Benefit Plan, Expected Future Benefit Payment, Year Five Minimum working hours needed for eligibility [Default Label] Tier One Leverage Capital Required to be Well Capitalized AvailableForSaleEquitySecuritiesGrossUnrealizedGains1 IntangibleAssetsNetOfAssociatedDeferredTaxLiabilities SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Current Income Tax Expense (Benefit) Deferred Federal Income Tax Expense (Benefit) Deferred State and Local Income Tax Expense (Benefit) Effective Income Tax Rate Reconciliation, Nondeductible Expense, Life Insurance, Percent Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Effective Income Tax Rate Reconciliation, Deduction, Percent Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective Income Tax Rate Reconciliation, Percent Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses Deferred Tax Assets, Gross Deferred Tax Liabilities, Deferred Expense, Debt Issuance Costs DeferredTaxLiabilitiesHedgeTerminationPayments DeferredTaxLiabilitiesPurchaseAccountingAdjustmentsNet Deferred Tax Liabilities, Other Deferred Tax Liabilities, Gross Loans and Leases Receivable, Related Parties Loans and Leases Receivable, Related Parties, Proceeds Operating Leases, Future Minimum Payments Due, Next Twelve Months Operating Leases, Future Minimum Payments, Due in Two Years Operating Leases, Future Minimum Payments, Due in Three Years Operating Leases, Future Minimum Payments, Due in Four Years Operating Leases, Future Minimum Payments, Due in Five Years Operating Leases, Future Minimum Payments, Due Thereafter Commitments to extend credit [Default Label] Assets, Fair Value Disclosure Fair Value, Option, Changes in Fair Value, Gain (Loss) Two Thousand And Fifteen [Member] [Default Label] Accrued interest receivable [Default Label] Deposits, Fair Value Disclosure Short-term Debt, Fair Value Long-term Debt, Fair Value Noninterest Income, Other Operating Income Revenues Other General Expense Operating Expenses Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest DividendsInExcessOfEarningsOfSubsidiaries Increase (Decrease) in Other Operating Assets and Liabilities, Net Payments to Acquire Marketable Securities Cash and Cash Equivalents, at Carrying Value Provision for Loan, Lease, and Other Losses