Document and Entity Information Document Type Document Quarterly Report Document Transition Report Document Period End Date Entity File Number Entity Registrant Name Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address State Or Province Entity Address, Address Line One Entity Address, City or Town Entity Address, Postal Zip Code City Area Code Local Phone Number Title of 12(b) Security Trading Symbol Security Exchange Name Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Ex Transition Period Entity Shell Company Entity Common Stock, Shares Outstanding Entity Central Index Key Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag Consolidated Balance Sheets Assets [Abstract] Assets Cash and Due from Banks Cash and due from banks Federal Funds Sold Federal funds sold Cash, Cash Equivalents, and Federal Funds Sold Total cash and cash equivalents Debt Securities, Available-for-Sale, Excluding Accrued Interest Fair Value Available-for-sale securities, at fair value Loan, Held-for-Sale, Fair Value Disclosure Loans held for sale, at fair value Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss Loans receivable, net of deferred fees Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest Allowance for credit losses Ending balance Beginning balance Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Net loans Interest Receivable Accrued interest receivable Property, Plant and Equipment, Net Banking premises and equipment, net The carrying amount of the non-public investments as of the balance sheet date. Non-public investments Non-public investments Bank Owned Life Insurance Bank-owned life insurance ("BOLI") Prepaid Expense and Other Assets Prepaid expenses and other assets Goodwill Ending balance Beginning balance Goodwill Finite-Lived Intangible Assets, Net Core deposit intangible, net Intangible assets, net Deferred Income Tax Assets, Net Deferred income tax asset, net Assets Total assets Liabilities and Equity [Abstract] Liabilities and shareholders' equity Deposits Deposits Amount of core deposit liabilities. Core Deposit Core deposits Interest-Bearing Domestic Deposit, Brokered Brokered deposits Deposits. Total deposits Advance Payments by Borrowers for Taxes and Insurance Mortgagors' escrow accounts Advance from Federal Home Loan Bank Federal Home Loan Bank ("FHLB") borrowings Carrying value of loans pledged to secure advances Accrued Liabilities and Other Liabilities Accrued expenses and other liabilities Carrying amount as of the balance sheet date of the accrued retirement liabilities. Accrued Retirement Liabilities Accrued retirement liabilities Liabilities Total liabilities Equity, Attributable to Parent [Abstract] Shareholders' equity: Preferred Stock, Value, Issued Preferred stock, $0.01 par value, 5,000,000 shares authorized; no shares issued and outstanding Common Stock, Value, Issued Common stock, $0.01 par value, 120,000,000 shares authorized; 44,765,178 and 45,770,128 shares issued and outstanding at March 31, 2026 and December 31, 2025, respectively Additional Paid in Capital Additional paid-in capital Unearned ESOP Shares Unallocated common shares held by the Employee Stock Ownership Plan ("ESOP") Retained Earnings (Accumulated Deficit) Retained earnings Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Total accumulated other comprehensive loss Equity, Attributable to Parent Balance at the end Balance at the beginning Total shareholders' equity Liabilities and Equity Total liabilities and shareholders' equity Preferred Stock, Par or Stated Value Per Share Preferred Stock, Par or Stated Value Per Share (in dollars per share) Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Preferred Stock, Shares Issued Preferred Stock, Shares Issued Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share (in dollars per share) Common Stock, Shares Authorized Common Stock, Shares Authorized Common Stock, Shares, Issued Common Stock, Shares, Issued Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Consolidated Statements of Income Interest and Dividend Income, Operating [Abstract] INTEREST AND DIVIDEND INCOME Interest and Fee Income, Loans and Leases Interest and fees on loans Interest Income, Debt Securities, Operating Interest on securities Amount of dividend and interest income on cash equivalents and other. Interest and Dividend Income on Cash Equivalents and Other Interest and dividends on cash equivalents and other Interest and Dividend Income, Operating Total interest and dividend income Interest Expense [Abstract] INTEREST EXPENSE Interest Expense, Deposits Interest on deposits Interest Expense, Borrowings Interest on borrowings Interest Expense Total interest expense Interest Income (Expense), Net NET INTEREST INCOME Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Abstract] PROVISION FOR CREDIT LOSSES Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) Provision for (release of) credit losses Provision for credit losses - loans Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) (Release of) provision for credit losses - unfunded commitments Financing Receivable, Credit Loss, Expense (Reversal) Total provision for credit losses Interest Income (Expense), after Provision for Loan Loss NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES Noninterest Income [Abstract] NONINTEREST INCOME Investment Banking Revenue Customer service fees Bank Owned Life Insurance Income Increase in cash surrender value of BOLI Fees and Commissions, Mortgage Banking and Servicing Mortgage banking income Gain (Loss) on Sale of Derivatives Swap contract income Gain (Loss) on Sales of Loans, Net (Loss) gain on sale of loans, net Noninterest Income, Other Operating Income Other income Noninterest Income Total noninterest income Noninterest Expense [Abstract] NONINTEREST EXPENSE Labor and Related Expense Salaries and employee benefits Noninterest expense related to directors' fees which are fees paid by an Entity to its directors. Directors' fees may be paid in addition to salary and other benefits and fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer. Noninterest Expense Directors and Professional Fees Director and professional service fees Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense and equipment expense including depreciation, repairs, rentals, and service contract costs. This item also includes equipment purchases which do not qualify for capitalization in accordance with the entity's accounting policy. This item may also include furniture expenses. Occupancy and Equipment Expenses Occupancy and equipment expenses Information Technology and Data Processing Data processing expenses Marketing and Advertising Expense Marketing and charitable contribution expenses Federal Deposit Insurance Corporation Premium Expense FDIC and state insurance assessments Business Combination, Integration Related Costs Merger and acquisition expenses General and Administrative Expense General and administrative expenses Noninterest Expense Total noninterest expense Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest INCOME BEFORE TAXES Income Tax Expense (Benefit) INCOME TAX EXPENSE NET INCOME Net income Weighted Average Number of Shares Outstanding, Basic Weighted average common shares outstanding, basic Average number of common shares outstanding used to calculate basic EPS Weighted Average Number of Shares Outstanding, Diluted Weighted average common shares outstanding, diluted Average number of common shares outstanding used to calculate diluted EPS Earnings Per Share, Basic Earnings per share, basic Basic (in dollars per share) Earnings Per Share, Diluted Earnings per share, diluted Diluted (in dollars per share) Consolidated Statements of Comprehensive Income Other Comprehensive Income OTHER COMPREHENSIVE INCOME, NET OF TAX: Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Net change in fair value of available-for-sale securities Net change in fair value of available-for-sale securities, After-Tax Amount Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent Net change in fair value of cash flow hedge Net change in fair value of cash flow hedge, net of tax, After-Tax Amount Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent TOTAL OTHER COMPREHENSIVE INCOME, NET OF TAX: Comprehensive Income (Loss), Net of Tax, Attributable to Parent TOTAL COMPREHENSIVE INCOME, NET OF TAX Consolidated Statements of Changes in Shareholders' Equity Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock Additional Paid-in Capital [Member] Additional Paid-In Capital Represents unallocated common shares, held by ESOP. Unallocated Common shares, Held By ESOP [Member] Unallocated Common Stock Held by ESOP Retained Earnings Retained Earnings AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Consolidated Statement of Changes in Shareholders' Equity Shares, Outstanding Balance at the end (in shares) Balance at the beginning (in shares) Other Comprehensive Income (Loss), Net of Tax Other comprehensive income (loss), After-Tax Amount Other comprehensive income (loss), net of tax Stock Issued During Period, Value, New Issues Proceeds of stock offering and issuance of common shares (net of costs of $9,600) Stock Issued During Period, Shares, New Issues Proceeds of stock offering and issuance of common shares (net of costs of $9,600) (in shares) Number of shares sold pursuant to the plan Stock Repurchased During Period, Value Repurchase of common shares under share repurchase plan Stock Repurchased During Period, Shares Repurchase of common shares under share repurchase plan (in shares) Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Restricted stock award issued Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Restricted stock award issued (in shares) APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Stock-based compensation Amortization of ESOP Award ESOP shares committed to be released Dividends, Common Stock Dividends paid Employee Stock Ownership Plan (ESOP), Shares Contributed to ESOP ESOP shares committed to be released Consolidated Statements of Cash Flows Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Domain] Domestic Tax Jurisdiction [Member] State and Local Jurisdiction [Member] State MASSACHUSETTS Massachusetts State and Local Tax Jurisdiction, Other [Member] Jurisdictions below 5 percent of total income taxes paid, net of refunds Net Cash Provided by (Used in) Operating Activities [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash from operating activities: Accretion (Amortization) of Discounts and Premiums, Investments Net (accretion) amortization of available-for-sale securities Amortization of Intangible Assets Amortization expense Amortization of core deposit intangible Provision for Loan, Lease, and Other Losses Provision for credit losses Amount of expense (income) related to loan hedge fair value adjustments, net. Fair Value Adjustments of Loan Hedge, Net Loan hedge fair value adjustments, net Amortization of Deferred Loan Origination Fees, Net Change in net deferred loan origination fees Payment for Origination and Purchase, Loan, Held-for-Sale Loans originated for sale Proceeds from Sale, Loan, Held-for-Sale Proceeds from sale of loans held for sale The net gain (loss) resulting from a sale of loans, including Mortgage Servicing Rights. Gain (Loss) on Sales of Loans, Including Mortgage Servicing Rights Gain on sale of loans Other Depreciation and Amortization Depreciation and amortization expense The gain (loss) during the period recognized during the period, including, but not limited to death benefit on bank owned life insurance contracts. Life Insurance, Corporate or Bank Owned, Gain (Loss) Gain from BOLI death benefit Life Insurance, Corporate or Bank Owned, Change in Value Increase in cash surrender values of BOLI Deferred Income Tax Expense (Benefit) Deferred income tax benefit Employee Stock Ownership Plan (ESOP), Compensation Expense ESOP expense Share-Based Payment Arrangement, Noncash Expense Stock-based compensation Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Loan, Held-for-Sale Net change in loans held for sale Increase (Decrease) in Accrued Interest Receivable, Net Accrued interest receivable Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other assets Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Accrued expenses and other liabilities The increase (decrease) during the reporting period in the amount of expenses incurred for retirement liability but not yet paid. Increase (Decrease) in Accrued Retirement Liabilities Accrued retirement liabilities Net Cash Provided by (Used in) Operating Activities NET CASH PROVIDED BY OPERATING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] CASH FLOWS FROM INVESTING ACTIVITIES The net cash outflow or inflow for the increase (decrease) in the beginning and end of period of loan originated. Proceeds from Loan Originations, Net of Repayments Loan originations and purchases, net of repayments Payments to Acquire Debt Securities, Available-for-Sale Purchases of available-for-sale securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Proceeds from maturities, calls and paydowns of available-for-sale securities Proceeds, Financing Receivable, Previously Written off, Recovery Recoveries of loans previously charged off Amount of cash outflow (inflow) from acquisition or sale of non-public investments. Payments for (Proceeds from) Non Public Investments Net change in non-public investments Proceeds from Life Insurance Policy Proceeds from BOLI death benefit Payment to Acquire Life Insurance Policy, Investing Activities Purchases of BOLI policies Proceeds from surrender of bank owned life insurance policies Proceeds from surrender of bank owned life insurance policies Proceeds from surrender of BOLI policies Payments to Acquire Property, Plant, and Equipment Purchases of banking premises and equipment Net Cash Provided by (Used in) Investing Activities NET CASH USED IN INVESTING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] CASH FLOWS FROM FINANCING ACTIVITIES Increase (Decrease) in Deposits Net change in deposits Increase (Decrease) in Advance Payments by Borrowers for Taxes and Insurance Net change in mortgagors' escrow accounts Payments for Repurchase of Common Stock Repurchase of common shares under share repurchase plans Payments of Ordinary Dividends, Common Stock Dividends paid Decrease in FHLB borrowings, net Advances of FHLB borrowings Payments of FHLBank Borrowings, Financing Activities Paydowns of FHLB borrowings Net Cash Provided by (Used in) Financing Activities NET CASH PROVIDED BY FINANCING ACTIVITIES