Equity Components [Axis] Common Stock [Member] Additional Paid-in Capital [Member] Unearned Compensation - ESOP [Member] Deferred Compensation, Share-Based Payments [Member] Retained Earnings [Member] AOCI Attributable to Parent [Member] Financial Instrument [Axis] Government-sponsored enterprise obligations [Member] Corporate Debt Securities [Member] Debt Securities [Member] Government-sponsored mortgage-backed securities [Member] U.S. government guaranteed mortgage-backed securities [Member] Collateralized Mortgage-Backed Securities [Member] US Treasury Securities [Member] U.S. Government Guaranteed Obligations [Member] Pledged Status [Axis] Asset Pledged as Collateral [Member] Pledging Purpose [Axis] Deposits [Member] Guaranteed by government agencies [Member] Not guaranteed by government agencies [Member] Corporate Bonds [Member] External Credit Rating by Grouping [Axis] External Credit Rating, Noninvestment Grade [Member] Class of Financing Receivable [Axis] Commercial Real Estate Non-owner Occupied [Member] Commercial Real Estate Owner Occupied [Member] Commercial Real Estate [Member] Residential Mortgage [Member] Home Equity Line of Credit [Member] Residential Portfolio Segment [Member] Commercial and Industrial Sector [Member] Consumer Loan [Member] Federal Home Loan Bank Advances [Member] Federal Reserve Bank Advances [Member] Debt Instrument [Axis] Participation Loan [Member] Counterparty Name [Axis] Chicopee Bancorp, Inc. [Member] Financial Asset, Aging [Axis] Financial Asset, Past Due [Member] Commercial Loan [Member] Real Estate Loan [Member] Internal Credit Assessment [Axis] Criticized [Member] Special Mention [Member] Substandard [Member] Residential Real Estate [Member] Unallocated [Member] Non-Owner Occupied [Member] Financial Asset, 30 to 59 Days Past Due [Member] Financial Asset, 60 to 89 Days Past Due [Member] Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Financial Asset, Not Past Due [Member] Owner Occupied [Member] Credit Loss Status [Axis] With no related allowance recorded [Member] With an allowance recorded [Member] Pass (Rated 1 - 4) [Member] Special Mention (Rated 5) [Member] Substandard (Rated 6) [Member] Financial Instrument Performance Status [Axis] Performing Financial Instruments [Member] Nonperforming Financial Instruments [Member] Intangible Asset, Finite-Lived, Class [Axis] Core Deposits [Member] Plan Name [Axis] Amended and Restated 2021 Omnibus Incentive Plan [Member] Award Type [Axis] Share-Based Payment Arrangement [Member] Grantee Status [Axis] Share-Based Payment Arrangement, Employee [Member] Share-Based Payment Arrangement, Nonemployee [Member] LTI Plan for 2023 [Member] Time Based Shares [Member] Performance Shares [Member] Vesting [Axis] Threshold [Member] Stretch [Member] 2021 Omnibus Plan [Member] LTI Plan for 2024 [Member] LTI Plan for 2025 [Member] LTI Plan for 2026 [Member] Target [Member] Actual [Member] Restricted Stock [Member] Federal Home Loan Bank Borrowings [Member] Lender Name [Axis] Line of Credit [Member] Other Borrowings [Member] FRB Discount Window [Member] Correspondent Banks [Member] Bank [Member] Long-Term Debt, Type [Axis] Subordinated Debt [Member] Hedging Designation [Axis] Not Designated as Hedging Instrument [Member] Derivative Instrument [Axis] Interest Rate Swap [Member] Hedging Relationship [Axis] Customer counterparties [Member] Dealer counterparties [Member] Measurement Frequency [Axis] Fair Value, Recurring [Member] Fair Value Hierarchy and NAV [Axis] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Nonrecurring [Member] Individually Evaluated Loans [Member] Measurement Basis [Axis] Reported Value Measurement [Member] Subsequent Event Type [Axis] Subsequent Event [Member] Cover [Abstract] Document Type Amendment Flag Amendment Description Document Registration Statement Document Annual Report Document Quarterly Report Document Transition Report Document Shell Company Report Document Shell Company Event Date Document Period Start Date Document Period End Date Document Fiscal Period Focus Document Fiscal Year Focus Current Fiscal Year End Date Entity File Number Entity Registrant Name Entity Central Index Key Entity Primary SIC Number Entity Tax Identification Number Entity Incorporation, State or Country Code Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Three Entity Address, City or Town Entity Address, State or Province Entity Address, Country Entity Address, Postal Zip Code Country Region City Area Code Local Phone Number Extension Written Communications Soliciting Material Pre-commencement Tender Offer Pre-commencement Issuer Tender Offer Title of 12(b) Security No Trading Symbol Flag Trading Symbol Security Exchange Name Title of 12(g) Security Security Reporting Obligation Annual Information Form Audited Annual Financial Statements Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Elected Not To Use the Extended Transition Period Document Accounting Standard Other Reporting Standard Item Number Entity Shell Company Entity Public Float Entity Bankruptcy Proceedings, Reporting Current Entity Common Stock, Shares Outstanding Documents Incorporated by Reference [Text Block] Statement of Financial Position [Abstract] Assets Cash and due from banks Federal funds sold Interest-bearing deposits and other short-term investments Total cash and cash equivalents Securities available-for-sale, at fair value (Amortized cost: $193,454 at June 30, 2026 and $198,194 at December 31, 2025) Securities held-to-maturity, at amortized cost (Fair value: $151,189 at June 30, 2026 and $158,504 at December 31, 2025) Marketable equity securities, at fair value Total investment securities Federal Home Loan Bank stock and other restricted stock, at amortized cost Total Loans Allowance for credit losses Net loans Premises and equipment, net Accrued interest receivable Bank-owned life insurance Deferred tax asset, net Goodwill Core deposit intangible Other assets Total Assets Liabilities and Shareholders’ Equity Deposits: Non-interest-bearing deposits Interest-bearing deposits Total deposits Borrowings: Short-term borrowings Long-term debt Subordinated debt  Total borrowings Securities pending settlement Other liabilities  Total Liabilities Shareholders’ Equity: Preferred stock - $0.01 par value, 5,000,000 shares authorized, none outstanding at June 30, 2026 and December 31, 2025 Common stock - $0.01 par value, 75,000,000 shares authorized, 20,045,872 and 20,372,786 shares issued and outstanding at June 30, 2026 and December 31, 2025, respectively Additional paid-in capital Unearned compensation – Employee Stock Ownership Plan (“ESOP”) Unearned compensation - Equity Incentive Plan Retained earnings Accumulated other comprehensive loss, net of tax Total Shareholders’ Equity Total Liabilities and Shareholders’ Equity Available for sale securities, amortized cost Held-to-maturity securities, fair value Preferred stock, par value (in dollars per share) Preferred stock, authorized Preferred stock, outstanding Common stock, par value (in dollars per share) Common stock, authorized Common stock, issued Common stock, outstanding Income Statement [Abstract] Interest and dividend income:  Commercial real estate loans Residential real estate loans Commercial and industrial loans Consumer loans Total interest income from loans Investment securities, taxable Marketable equity securities Total interest and dividend income from investment securities Other investments Short-term investments  Total interest income from cash and cash equivalents  Total interest and dividend income Interest expense: Deposits Short-term borrowings Long-term debt Subordinated debt Total interest expense Net interest and dividend income Provision for (reversal of) credit losses Net interest and dividend income after provision for (reversal of) credit losses Non-interest income: Service charges and fees Wealth management income Income from bank-owned life insurance Net unrealized gain on marketable equity securities Gain on bank-owned life insurance death benefits Gain on mortgage banking activities Gain on non-marketable equity investments Other income Total non-interest income Non-interest expense: Salaries and employee benefits Occupancy Furniture and equipment Data processing Software Debit card and ATM processing expense Professional fees FDIC insurance assessment Advertising Other non-interest expenses Total non-interest expense Income before income taxes Income tax provision  Net income Earnings per common share: Basic earnings per share Weighted average basic shares outstanding Diluted earnings per share Weighted average diluted shares outstanding Dividends per share Net income Other comprehensive income (loss):  Change in fair value of securities available-for-sale  Tax effect Net-of-tax amount Other comprehensive income (loss) Total comprehensive income Statement [Table] Statement [Line Items] Beginning balance, value Beginning balance, shares Comprehensive income (loss) Common stock held by ESOP committed to be released Share-based compensation - equity incentive plan Forfeited equity incentive plan shares Forfeited equity incentive plan shares reissued Common stock repurchased Common stock repurchased, shares Issuance of common stock in connection with equity incentive plan Issuance of common stock in connection with equity incentive plan, shares Cash dividends declared and paid on common stock ($0.07 per share) Ending balance, value Ending balance, shares Statement of Stockholders' Equity [Abstract] Common stock held by ESOP committed to be released (shares) Forfeited equity incentive plan shares (in shares) Forfeited equity incentive plan shares reissued (in shares) Cash dividends declared and paid on common stock (per share) Statement of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization of premises and equipment Net amortization of purchase accounting adjustments Amortization of core deposit intangible Net amortization of premiums and discounts on securities and mortgage loans Net amortization of deferred costs on loans Net amortization of premiums on subordinated debt Share-based compensation expense ESOP expense Net change in unrealized gains on marketable equity securities Gain on mortgage banking activities 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 CASH FLOWS FROM INVESTING ACTIVITIES: Proceeds from calls, maturities, and principal collections of securities held-to-maturity Purchases of securities available-for-sale Proceeds from calls, maturities, and principal collections of securities available-for-sale Proceeds from redemption and sales of marketable equity securities Purchase of marketable equity securities Net loan originations and principal payments Redemption of Federal Home Loan Bank of Boston stock Purchases of premises and equipment Proceeds from sales of premises and equipment Proceeds from payout on bank-owned life insurance Net cash provided by (used in) investing activities CASH FLOWS FROM FINANCING ACTIVITIES: Net increase in deposits Increase (decrease) in short-term borrowings Repayment of long-term debt Cash dividends paid on common stock Repurchase of common stock Net cash (used in) provided by financing activities NET CHANGE IN CASH AND CASH EQUIVALENTS: Beginning of period End of period Supplemental cash flow information: Net change in cash due to broker for common stock repurchased Available-for-sale securities purchases pending settlement Interest paid Taxes paid Pay vs Performance Disclosure [Table] Executive Category [Axis] Individual [Axis] Adjustment to Compensation [Axis] Measure [Axis] Pay vs Performance Disclosure, Table Company Selected Measure Name Named Executive Officers, Footnote Peer Group Issuers, Footnote Changed Peer Group, Footnote PEO Total Compensation Amount PEO Actually Paid Compensation Amount Adjustment To PEO Compensation, Footnote Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Compensation Actually Paid Amount Adjustment to Non-PEO NEO Compensation Footnote Equity Valuation Assumption Difference, Footnote Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Company Selected Measure Total Shareholder Return Vs Peer Group Compensation Actually Paid vs. Other Measure Tabular List, Table Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Net Income (Loss) Company Selected Measure Amount Other Performance Measure, Amount Adjustment to Compensation, Amount PEO Name Name Non-GAAP Measure Description Additional 402(v) Disclosure Pension Benefits Adjustments, Footnote Equity Awards Adjustments, Footnote Erroneously Awarded Compensation Recovery [Table] Restatement Determination Date [Axis] Restatement Determination Date Aggregate Erroneous Compensation Amount Erroneous Compensation Analysis Stock Price or TSR Estimation Method Outstanding Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Not Yet Determined Name Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery, Explanation of Impracticability Name Compensation Amount Restatement does not require Recovery Awards Close in Time to MNPI Disclosures [Table] Award Timing MNPI Disclosure Award Timing Method Award Timing Predetermined Award Timing MNPI Considered Award Timing, How MNPI Considered MNPI Disclosure Timed for Compensation Value Awards Close in Time to MNPI Disclosures, Table Name Underlying Securities Exercise Price Fair Value as of Grant Date Underlying Security Market Price Change Trading Arrangements, by Individual [Table] Trading Arrangement [Axis] Material Terms of Trading Arrangement Name Title Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted Adoption Date Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated Termination Date Expiration Date Arrangement Duration Aggregate Available Insider Trading Policies and Procedures [Line Items] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Not Adopted Accounting Policies [Abstract] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Earnings Per Share [Abstract] EARNINGS PER SHARE Equity [Abstract] COMPREHENSIVE INCOME (LOSS) Investments, Debt and Equity Securities [Abstract] INVESTMENT SECURITIES Receivables [Abstract] LOANS AND ALLOWANCE FOR CREDIT LOSSES Intangible Asset, Goodwill and Other [Abstract] GOODWILL AND OTHER INTANGIBLES Share-Based Payment Arrangement [Abstract] SHARE-BASED COMPENSATION Debt Disclosure [Abstract] SHORT-TERM BORROWINGS AND LONG-TERM DEBT SUBORDINATED DEBT Derivative Instruments and Hedging Activities Disclosure [Abstract] DERIVATIVES AND HEDGING ACTIVITIES Fair Value Disclosures [Abstract] FAIR VALUE OF ASSETS AND LIABILITIES Accounting Changes and Error Corrections [Abstract] RECENT ACCOUNTING PRONOUNCEMENTS Segment Reporting [Abstract] SEGMENT Subsequent Events [Abstract] SUBSEQUENT EVENTS Nature of Operations and Basis of Presentation Wholly-owned Subsidiaries Principles of Consolidation Estimates Basis of Presentation Reclassifications Earnings per common share for the three and six months ended June 30, 2026 and the three and six months ended June 30, 2025 have been computed based on the following: The components of accumulated other comprehensive loss included in shareholders’ equity are as follows: The following tables summarize the amortized cost and fair value of securities available-for-sale and held-to-maturity at June 30, 2026 and December 31, 2025 The following table summarizes the unrealized gains recognized on marketable equity securities for the periods indicated: The amortized cost and fair value of securities available-for-sale and held-to-maturity at June 30, 2026, by final maturity, are shown below. The following tables summarize the gross unrealized losses and fair value of the Company’s securities portfolio, aggregated by investment category and length of time that individual securities have been in a continuous loss position at June 30, 2026 and December 31, 2025: The following table presents the summary of the loan portfolio by the major classification of the loan at the periods indicated: A summary of the activity in the balances of mortgage servicing rights follows: An analysis of changes in the allowance for credit losses by segment for the three and six months ended June 30, 2026 and the three and six months ended June 30, 2025 is as follows: The following tables present an age analysis of past due loans as of the dates indicated: The following table is a summary of the Company’s nonaccrual loans by major categories at June 30, 2026 and December 31, 2025: The following table summarizes the Company’s individually evaluated collateral dependent loans by class as of the dates indicated: The following tables summarize the amortized cost balances of the Company’s loan portfolios presented by credit quality and origination year as of June 30, 2026 and December 31, 2025. The following table summarizes information about total loans rated Special Mention, Substandard, Doubtful or Loss for the periods noted. The Threshold, Target and Stretch metrics under the 2023 LTI Plan are as follows The Threshold, Target and Stretch metrics under the 2024 LTI Plan are as follows The Threshold, Target and Stretch metrics under the 2025 LTI Plan are as follows The Threshold, Target and Stretch metrics under the 2026 LTI Plan are as follows A summary of the status of unvested restricted stock awards at June 30, 2026 and June 30, 2025 is presented below The tables below present the fair value of our derivative financial instruments designated as hedging and non-hedging instruments as well as our classification on the consolidated balance sheet as of June 30, 2026 and December 31, 2025 Assets and liabilities measured at fair value on a recurring basis are summarized below The following tables summarize the fair value hierarchy used to determine the carrying values of the related assets as of June 30, 2026 and December 31, 2025 The estimated fair values of our financial instruments are as follows Number of banking offices in which bank operates Net income applicable to common stock Average number of common shares issued Less: Average unallocated ESOP Shares Less: Average unvested performance-based equity incentive plan shares Average number of common shares outstanding used to calculate basic earnings per common share Effect of dilutive performance-based equity incentive plan shares Average number of common shares outstanding used to calculate diluted earnings per share Accumulated other comprehensive income (loss) before tax Tax effect Accumulated other comprehensive loss Marketable Securities [Table] Marketable Securities [Line Items] Available-for-sale securities, amortized cost Available-for-sale securities, gross unrealized gains Available-for-sale securities, gross unrealized losses Available-for-sale securities, at fair value Held-to-maturity securities, amortized cost Held-to-maturity securities, gross unrealized gains Held-to-maturity securities, gross unrealized losses Total, amortized cost Total, gross unrealized gains Total, gross unrealized losses Total, fair value Net gains recognized during the period on marketable equity securities Net gains (losses) recognized during the period on equity securities sold during the period Net unrealized gains recognized during the period on marketable equity securities held at end of period Available-for-sale securities, due in one year or less, amortized cost Available-for-sale securities, due in one year or less, fair value Held-to-maturity securities, due in one year or less, amortized cost Held-to-maturity securities, due in one year or less, fair value Available-for-sale securities, due after one year through five years, amortized cost Available-for-sale securities, due after one year through five years, fair value Held-to-maturity securities, due after one year through five years, amortized cost Held-to-maturity securities, due after one year through five years, fair value Available-for-sale securities, due after five years through ten years, amortized cost Available-for-sale securities, due after five years through ten years, fair value Held-to-maturity securities, due after five years through ten years, amortized cost Held-to-maturity securities, due after five years through ten years, fair value Available-for-sale securities, due after ten years, amortized cost Available-for-sale securities, due after ten years, fair value Held-to-maturity securities, due after ten years, amortized cost Held-to-maturity securities, due after ten years, fair value Amortized cost, available for sale Fair value, available for sale Amortized cost, held to maturity Fair value, held to maturity Available-for-sale, less than 12 months, number of securities Available-for-sale, less than 12 months, fair value Available-for-sale, less than 12 months, gross unrealized loss Available-for-sale, less than 12 months, depreciation from amortized cost basis (%) Available-for-sale, over 12 months, number of securities Available-for-sale, over 12 months, fair value Available-for-sale, over 12 months, gross unrealized loss Available-for-sale, over 12 months, depreciation from amortized cost basis (%) Held-to-maturity, less than 12 months, number of securities Held-to-maturity, less than 12 months, fair value Held-to-maturity, less than 12 months, gross unrealized loss Held-to-maturity, less than 12 months, depreciation from amortized cost basis (%) Held-to-maturity, over 12 months, number of securities Held-to-maturity, over 12 months, fair value Held-to-maturity, over 12 months, gross unrealized loss Held-to-maturity, over 12 months, depreciation from amortized cost basis (%) Total, less than 12 months, number of securities Total, less than 12 months, fair value Total, less than 12 months, gross unrealized loss Total, over 12 months, number of securities Total, over 12 months, fair value Total, over 12 months, gross unrealized loss Securities fair value Accrued interest receivable on available for sale securities Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Accrued interest receivable on held-to-maturity securities Available-for-sale, number of securities, fair value less than amortized cost Available-for-sale, gross unrealized loss Available-for-sale, depreciation from amortized cost basis (%) Held-to-maturity, gross unrealized loss Held-to-maturity, depreciation from amortized cost basis (%) Held-to-maturity, number of securities, fair value less than amortized cost Accounts and Financing Receivables [Table] Accounts, Notes, Loans and Financing Receivable [Line Items] Total loans Plus: Unearned premiums and deferred loan fees and costs, net Less: Allowance for credit losses Balance at the beginning of period: Amortization Balance at the end of period Fair value at the end of period Financing Receivable, Allowance for Credit Loss [Table] Financing Receivable, Allowance for Credit Loss [Line Items] Allowance for credit losses for loans Beginning balance, allowance for credit losses Provision for (reversal of) credit losses Charge-offs Recoveries Ending balance, allowance for credit losses Allowance for credit losses for off-balance sheet exposures Beginning balance Provision for (reversal of) credit losses Ending balance Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Line Items] Non-Accrual Loans Financing Receivable, Nonaccrual, With Allowance Financing Receivable, Nonaccrual, No Allowance Financing Receivable, Nonaccrual Accrued Interest Receivable Reversed from Income Individually evaluated loans, recorded investment Loans with an allowance recorded, related allowance Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Excluding Accrued Interest, Year One, Originated, Current Fiscal Year Financing Receivable, Excluding Accrued Interest, Year Two, Originated, Fiscal Year before Current Fiscal Year Financing Receivable, Excluding Accrued Interest, Year Three, Originated, Two Years before Current Fiscal Year Financing Receivable, Excluding Accrued Interest, Year Four, Originated, Three Years before Current Fiscal Year Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year Financing Receivable, Excluding Accrued Interest, Revolving Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Fee, and Loan in Process Current period gross charge-offs, Year-to-Date Current period gross charge-offs, Year Four, Originated, Three Years before Current Fiscal Year Current period gross charge-offs, Prior Current period gross charge-offs, Revolving Current period gross charge-offs, Revolving Loans Converted to Term Loans Current period gross charge-offs Loans as a percentage of total loans Loans as a percentage of Risk-Based Capital FHLB advances Serviced commercial loans for participants Weighted average prepayment speed, PSA Weighted average internal rate of return Weighted average servicing fee percentage Net cost to service loans Mortgage loans serviced for others Servicing fee income Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Accrued interest receivable on loans held for investment First mortgages maximum loan-to-value percentage, owner-occupied homes First mortgages maximum loan-to-value percentage, second homes First mortgages maximum loan-to-value percentage, investment properties Loan-to-value ratio requiring private mortgage insurance Residential equity loans and lines maximum percentage of appraised value underwritten Weighted average remaining maturity period Charge-offs Percentage of participation in loan Net charge-offs (recoveries) Net charge-offs (recoveries), percentage of average loans Recovery Total past due, percentage of total loans Nonaccrual loans Nonaccrual loans, percentage of total loans Nonperforming assets Nonperforming assets, percentage of total assets Minimum loan-to-value percentage considered for individual evaluation Individually evaluated loans Minimum loan balance ratings reviewed annually Percentage of total loans Increase (decrease) in loans Percentage decrease in loans Loans as a percentage of rating category Total criticized loans percentage current and paying as agreed Percentage of risk-based capital Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Line Items] Acquired core deposit intangible Future amortization of core deposit intangible assets year 1 Future amortization of core deposit intangible assets year 2 Future amortization of core deposit intangible assets thereafter Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] December 31, 2023 December 31, 2024 December 31, 2025 Three-Year Cumulative Diluted EPS December 31, 2024 December 31, 2025 December 31, 2026 Three-Year Cumulative Diluted EPS December 31, 2025 December 31, 2026 December 31, 2027 Three-Year Cumulative Diluted EPS December 31, 2028 Beginning balance Beginning balance Shares granted Shares granted Forfeited shares reissued Forfeited shares reissued Shares forfeited Shares forfeited Shares vested Shares vested Ending balance Ending balance Increase in total number of shares of common stock reserved for issuance Vesting period Vesting percentage Performance measure weighting percentage Percentage paid Period following end of performance period to determine vesting date Shares forfeited Shares granted per director Shares granted and fully vested Percentage of shares granted Shares eligible for vesting Shares available for grant Restricted stock expense Schedule of Long-Term Debt Instruments [Table] Debt Instrument [Line Items] Pledged collateral Short term borrowings Weighted average rate Line of credit available Borrowing capacity Other Borrowings Weighted average rate Long-term debt Principal amount Interest rate Maturity Date Percentage of annual reduction in Tier 2 capital Principal amount outstanding Benchmark rate Interest rate basis spread Issuance costs Amortization of subordinated debt issuance costs Redemption price percentage of principal Earliest redemption date Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Line Items] Fair value of derivative assets Fair value of derivative liability Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Assets: Securities available-for-sale Marketable equity securities Interest rate swaps Total assets Liabilities: Interest rate swaps Collateral dependent loans Total losses Fair Value, by Balance Sheet Grouping [Table] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Assets: Cash and cash equivalents Securities held-to-maturity FHLB and other restricted stock Loans - net Accrued interest receivable Mortgage servicing rights Derivative asset Liabilities: Deposits Short-term borrowings Long-term debt Subordinated debt Accrued interest payable Derivative liabilities Number of reportable segments Subsequent Event [Table] Subsequent Event [Line Items] Proceeds from sale of buildings Gain on sale of buildings Amount of operating interest income on other investments. 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. Amount of operating interest income on cash and cash equivalents. The amount refers to service charges and fees. Amount of software expense during the period. Debit card and ATM processing expense during the period. Cash inflow (outflow) related to a loan originations and principal payments, net. Available-for-sale securities purchases pending settlement. Amount of net change in cash due to broker. Represents the information pertaining to employee stock ownership plan ESOP plan. Value of forfeited equity incentive plan shares reissued during the period. Number of forfeited equity incentive plan shares reissued during the period. Number of branches the bank operates by location. Average number of shares outstanding that are used in calculating diluted EPS determined based on the timing of issuance of shares or units in the period. Government Sponsored Enterprise Obligations Government-sponsored mortgage-backed securities. U.S. government guaranteed mortgage-backed securities. U.S. Government Guaranteed Obligations. Guaranteed by government agencies. Not guaranteed by government agencies. Corporate Bonds Number of investments in debt securities measured at amortized cost (held-to-maturity), in continuous unrealized loss position for less than 12 months. Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and debt securities measured at amortized cost (held-to-maturity), in continuous unrealized loss position for less than 12 months. Amount of investment in available-for-sale and held-to-maturity debt securities in continuous unrealized loss position for less than 12 months. Amount of accumulated unrealized loss on investment in avilable-for-sale and held-to-maturity debt securities in continuous unrealized loss position for less than 12 months. Available for sale securities continuous unrealized loss position less than twelve months depreciation from amortized cost percentage. Held to maturity securities continuous unrealized loss position less than twelve months depreciation from amortized cost percentage. Number of investments in debt securities measured at amortized cost (held-to-maturity), in continuous unrealized loss position for 12 months or longer. Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and debt securities measured at amortized cost (held-to-maturity), in continuous unrealized loss position 12 months or longer. Amount of investment in available-for-sale and held-to-maturity debt securities in continuous unrealized loss position 12 months or longer. Amount of accumulated unrealized loss on investment in avilable-for-sale and held-to-maturity debt securities in continuous unrealized loss position for 12 months or longer. Available for sale securities continuous unrealized loss position twelve months or longer depreciation from amortized cost percentage. Held to maturity securities continuous unrealized loss position twelve months or longer depreciation from amortized cost percentage. Available for sale securities continuous unrealized loss position depreciation from amortized cost percentage. Held to maturity securities continuous unrealized loss position depreciation from amortized cost percentage. Number of investments in debt securities measured at amortized cost (held-to-maturity), in continuous unrealized loss position. Wealth management income. Commercial loans serviced for participants at period end. It represents the percentage of weighted average servicing fee. Weighted average prepayment speed, Public Securities Association Standard Prepayment Model. It represents cost to service loans. It represents the percentage of weighted average internal rate of return. Third party mortgage loans serviced at period end. Servicing fee income. Maximum loan-to-value percentage for first mortgages on owner-occupied homes. Maximum loan-to-value percentage for first mortgages on second homes. Maximum loan-to-value percentage for first mortgages on investment properties. The minimum loan-to-value ratio at loan origination requiring private mortgage insurance. Maximum percentage of appraised value of property underwritten by residential equity loans and lines. Information related to unallocaetd. Percentage of increase (decrease) in loans during the period. The element represents non owner occupied member. The element represents owner occupied member. Amortized cost of financing receivable on nonaccrual status with allowance for credit loss. Excludes net investment in lease. Loans with loan-to-value above specified percentage or have demonstrated a specific weakness (e.g., slow payment history, industry weakness, or other clear credit deterioration) may be considered for individual evaluation if they are determined not to share similar risk characteristics within the segment. The element represents financing receivable individually evaluated for impairment table text block. With no related allowance recorded. With an allowance recorded. On an annual basis, or more often if needed, the Company formally reviews the ratings on all loans over specified balance. Represents the pass. Represents the special member. Represents the substandard. Amount, excluding accrued interest, of writeoff of revolving financing receivable converted to term loan. The element represents schedule of criticized loans table text block. Amount, excluding accrued interest, of writeoff of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease. Amount, excluding accrued interest, of writeoff of financing receivable that can be withdrawn, repaid, and redrawn. The element represents financing receivable excluding accrued interest allowance for credit loss writeoff originated in current fiscal year. Average number of basic shares determined by relating the portion of time within a reporting period that common shares have been outstanding to the total time in that period. Amount of increase (decrease) in loans during the period. Percentage of financing receivable to total credit assessment category. Percentage of financing receivable current and paying as agreed. Accretion of purchase accounting adjustments net. Amount of gain (loss) on death benefit of bank-owned life insurance policy. Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized after second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Represents the time based. Name of the equity-based compensation arrangement plan. Percentage of performance measure weighting percentage under share-based payment arrangement. Percentage of target value percentage paid under share-based payment arrangement. Threshold. It represents stretch member. Schedule of original and adjusted threshold and target metrics under the LTI Plans. Target. The element represents actual member. 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. Percent of performance stock awards participants will be able to earn during the current performance year. The element represents three year cumulative diluted e p s. 2021 Omnibus Plan. The element represents share based compensation arrangement by share based payment award equity instruments other than options grants per director in period. Name of the equity-based compensation arrangement plan. Percentage of shares granted under share-based payment arrangement. Schedule of original and adjusted threshold and target metrics under the LTI Plans. Percent of performance stock awards participants will be able to earn during the seventh performance year. Percent of performance stock awards participants will be able to earn during the eighth performance year. Percent of performance stock awards participants will be able to earn during the ninth performance year. Three-year cumulative earnings per share diluted. Name of the equity-based compensation arrangement plan. Schedule of original and adjusted threshold and target metrics under the LTI Plans. Percent of performance stock awards participants will be able to earn during the tenth performance year. Percent of performance stock awards participants will be able to earn during the eleventh performance year. Percent of performance stock awards participants will be able to earn during the twelfth performance year. Three-year cumulative earnings per share diluted. Schedule of original and adjusted threshold and target metrics under the LTI Plans. Name of the equity-based compensation arrangement plan. Percent of performance stock awards participants will be able to earn during the Thirteen performance year. The number of forfeited equity-based payment instruments, excluding stock (or unit) options, that were reissued during the reporting period. Weighted average fair value as of the grant date of forfeited equity-based award plans other than stock (unit) option plans that were reissued during the period. Other Borrowings. FRB Discount Window Correspondent Banks. Bank Customer counterparties. Dealer counterparties. The element represents collateral dependent loans. 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. The fair value amount of subordinated debt. Interest Payable, Fair Value Disclosure Period following end of performance period to determine vesting date for share-based payment award. Commercial Real Estate Owner Occupied. Commercial Real Estate Non-owner Occupied. Weighted average remaining maturity used to estimate alowance for credit losses for loan segment. Individually Evaluated Loans. Gain (loss) on non-marketable equity investments. Nonaccrual loans. Amount, excluding accrued interest, of writeoff of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease. Participation Loan. Percentage of participation in loan receivable. Percentage of average loans of decrease (increase) in allowance for credit loss on financing receivable from writeoff (recovery). Chicopee Bancorp, Inc. Percentage, before allowance for credit loss, of financing receivable to total risk-based capital. Amended and Restated 2021 Omnibus Incentive Plan. Percentage of original amount eligible for Tier 2 capital that must be reduced annually (net of redemptions) during the last five years the notes are outstanding. The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that are eligible for vesting at a future date. Amount of accrued interest reversed on financing receivable on nonaccrual status. Nonperforming assets are defined as financing receivable on nonaccrual status and other real estate owned. Nonperforming assets, defined as financing receivable on nonaccrual status and other real estate owned, as a percentage of total assets. Cash, Cash Equivalents, and Federal Funds Sold Investments Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Assets [Default Label] Deposits [Default Label] Liabilities Unearned ESOP Shares Deferred Compensation Equity Equity, Attributable to Parent Liabilities and Equity Interest and Fee Income, Financing Receivable, Held-in-Portfolio Interest and Dividend Income, Securities, Operating Interest Income Cash and Cash Equivalents Interest and Dividend Income, Operating Interest Expense, Short-Term Borrowings Interest Expense, Other Long-Term Debt Interest Expense, Subordinated Notes and Debentures Interest Expense, Operating Interest Income (Expense), Operating Interest Income (Expense), after Provision for Loan Loss Noninterest Income Noninterest Expense Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Comprehensive Income (Loss), Net of Tax, Attributable to Parent Shares, Outstanding Stock Repurchased and Retired During Period, Value Stock Repurchased During Period, Value Stock Repurchased During Period, Shares Dividends, Common Stock, Cash Accretion (Amortization) of Discounts and Premiums, Investments Gain (Loss) on Sales of Loans, Net Increase (Decrease) in Interest and Dividends Receivable Increase (Decrease) in Other Operating Assets Increase (Decrease) in Other Operating Liabilities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Payments to Acquire Debt Securities, Available-for-Sale Payments to Acquire Marketable Securities Payment Loan Originations And Principal Payments Net Payments for (Proceeds from) Federal Home Loan Bank Stock Payments to Acquire Property, Plant, and Equipment Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Repayments of Long-Term Debt Payments of Dividends Payments for Repurchase of Common Stock Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Available-for-sale securities purchases pending settlement Forgone Recovery, Individual Name Outstanding Recovery, Individual Name Awards Close in Time to MNPI Disclosures, Individual Name Trading Arrangement, Individual Name Weighted Average Number of Shares, Employee Stock Ownership Plan Shares Not Committed to be Released Weighted Average Number of Shares, Contingently Issuable Average number of common shares outstanding used to calculate basic earnings per common share Average number of common shares outstanding used to calculate diluted earnings per common share AOCI Tax, Attributable to Parent Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss Debt Securities, Available-for-Sale and Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Gain Debt Securities, Available-for-Sale and Held-to-Maturity, Cumulative Unrecognized Loss Equity Securities, FV-NI, Gain (Loss) Debt Securities, Available-for-Sale and Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number of Positions Debt Securities, Available-for-sale and Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months Debt Securities, Available-for-sale and Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Debt Securities, Available-for-Sale and Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions Debt Securities, Available-for-sale and Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer Debt Securities, Available-for-sale and Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Servicing Asset at Amortized Cost Servicing Asset at Amortized Cost, Amortization Servicing Asset at Fair Value, Amount Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) Off-Balance-Sheet, Credit Loss, Liability Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) December 31, 2022 Year 7 December 31, 2023 [Default Label] Three-year Cumulative Diluted Earnings Per Share Three Percentage of preformance earned during year ten Percentage of preformance earned during year eleven Three-year Cumulative Diluted Earnings Per Share Four 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, 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 Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value Reissued 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, Vested in Period Debt, Weighted Average Interest Rate Long-Term Debt Assets, Fair Value Disclosure Fair Value, Option, Changes in Fair Value, Gain (Loss) Accrued interest receivable [Default Label] Deposits, Fair Value Disclosure Short-Term Debt, Fair Value Long-Term Debt, Fair Value Subordinated Debt Fair Value