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Average number of common shares outstanding Financing Receivable, Allowance for Credit Loss, Writeoff Loans charged-off Current-period gross write-offs , Total Current-period gross write-offs , Total Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year Term loan by origination two years before current fiscal year Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Financing Receivable Portfolio Segment [Axis] Unearned Compensation ESOP Employee Stock Ownership Plan, Common, Shares [Member] Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Available-for-sale, over twelve months, fair value Entity Current Reporting Status Entity Current Reporting Status Class of Financing Receivable [Axis] Municipal Bonds [Member] Municipal Bonds Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 Common Stock, Shares Authorized Sale of shares of common stock in stock offering Common stock, shares authorized Document Fiscal Period Focus Document Fiscal Period Focus Entity Shell Company Entity Shell Company Federal Reserve Bank Stock Federal reserve bank stock Performing Performing [Member] Performing. Cash and Cash Equivalent Total cash and cash equivalents Cash and cash equivalents Common Stock, Shares, Issued Number of common stock company sold Common stock, shares issued Statement [Table] Interest Receivable Accrued interest receivable Non-interest-bearing deposits Noninterest-Bearing Deposit Liabilities Noninterest-Bearing Deposit Liabilities, Total Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value Held-to-maturity, over twelve months, fair value Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year Term loan by origination four years before current fiscal year Statement [Line Items] Derivative Instruments in Hedges, Liabilities, at Fair Value Liability Derivatives Fair Value Entity Filer Category Entity Filer Category Financial Asset, 60 to 89 Days Past Due [Member] Financial receivables 60 to 89 days past due Liabilities and Equity Total liabilities and stockholders' equity Financing Receivable, Allowance for Credit Loss, Recovery Recoveries Noninterest Income Total non-interest income Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Accrued Interest Receivable [Policy Text Block] Disclosure of accounting policy for accrued interest receivable. Accrued Interest Receivable Financial Asset, 30 to 59 Days Past Due [Member] Financial receivables 30 to 59 days past due Total loans Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process Amortization of Deferred Loan Origination Fees, Net Amortization (accretion) of net deferred loan origination costs/fees Financial liabilities: Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Amortized Cost Available-for-sale securities, over 1 year through 5 years, amortized cost Deposits Deposits, Fair Value Disclosure Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted Change in Accounting Principle, Indirect Effect [Axis] Equity Securities [Member] Marketable Equity Securities Investments Classified by Contractual Maturity Date [Table Text Block] Summary of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity Earnings Per Share, Basic Earnings Per Share, Basic, Total Net loss per share, basic Net income per share, basic Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain Securities held to maturity, gross unrealized gains Payments for (Proceeds from) Loans and Leases Payments for (Proceeds from) Loans and Leases, Total Loan originations, net of principal payments Restrictions on Cash and Cash Equivalents [Text Block] Restrictions on cash and cash equivalents. Restrictions on Cash and Amounts Due From Banks Multi - family Multifamily [Member] Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Mortgage loans Mortgage Portfolio Segment [Member] Portfolio segment of the company's total financing receivables related to mortgage. Held-to-maturity securities, over 10 years, amortized cost Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years Derivative Assets [Member] Derivative assets. Derivative Assets Payments for (Proceeds from) Productive Assets Payments for (Proceeds from) Productive Assets, Total Purchase of premises and equipment, net Entity Small Business Entity Small Business Interest and Dividend Income, Operating [Abstract] Interest and dividend income: Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit), Total Retained earnings Debt Securities, Held-to-Maturity, Allowance for Credit Loss Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Ending Balance Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Beginning Balance Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Total Held-to-maturity, allowance for credit loss Sale of Stock, Price Per Share Price per share Cummulative effect of change in accounting principle Change in Accounting Principle, Indirect Effect [Member] Organization, Consolidation and Presentation of Financial Statements [Abstract] Amendment Flag Amendment Flag OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Unrealized holding gains (losses) Entity Address, Postal Zip Code Entity Address, Postal Zip Code Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Net cash provided by operating activities Substandard [Member] 8 (Substandard) Common Stock [Member] Common Stock Loans, net Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss, Total Amortization of Debt Discount (Premium) Net amortization of securities Business Description and Accounting Policies [Text Block] Business Portion at Fair Value Measurement [Member] [Default] Portion at Fair Value Measurement [Member] Entity Address, Address Line One Entity Address, Address Line One Marketable Securities [Table] Fair Value Hierarchy and NAV [Axis] Earnings Per Share [Abstract] Supplemental Cash Flow Information [Abstract] Supplemental cash flow information: Residential real estate Residential Real Estate [Member] Derivative Asset Derivative Asset, Total Derivative assets General Discussion of Derivative Instruments and Hedging Activities [Abstract] Derivatives and Hedging Activities Investment Type [Axis] Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff Current-period gross write-offs , Prior Payments to Acquire Debt Securities, Available-for-Sale Purchases Document Type Document Type Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Financing Receivable, Individually Evaluated for Credit Loss Financing Receivable, Individually Evaluated for Credit Loss, Total Individually evaluated loans Income Taxes Paid, Net Income Taxes Paid, Net, Total Income taxes paid, net of (refunds) Entity Central Index Key Entity Central Index Key Investments, Debt and Equity Securities [Abstract] Interest-Bearing Deposits in Banks and Other Financial Institutions Interest-bearing deposits Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Net change in cash and cash equivalents Subsequent Event Type [Domain] Accrued interest receivable on investments Accrued Investment Income Receivable Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Anti-dilutive shares Common Stock, Par or Stated Value Per Share Common stock, par value Debt Securities, Available-for-Sale, Amortized Cost Securities available for sale, amortized cost Securities available for sale, amortized cost Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Held-to-maturity, less than twelve months, gross unrealized loss Debt Securities, Available-for-Sale Securities available for sale, at fair value Debt securities available for sale Securities available for sale, at fair value Noninterest Income [Abstract] Non-interest income: Doubtful [Member] 9 (Doubtful) Derivative [Table] Home equity loans and lines-of-credit Home equity loans and lines-of credit [Member] Home equity loans and lines-of credit. Fair Value Estimate of Fair Value Measurement [Member] Financial assets: Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Derivative, Notional Amount Notional Amount Interest on federal funds sold and other interest-bearing deposits Interest Income, Federal Funds Sold Current Fiscal Year End Date Current Fiscal Year End Date U S Government Agency and U S Government Sponsored Enterprise Residential Mortgage Backed Securities [Member] U S government agency and U S government sponsored enterprise residential mortgage backed securities. U.S. Government Agency and U.S. Government-Sponsored Enterprise Residential Mortgage-Backed Securities Document Quarterly Report Document Quarterly Report Receivables [Abstract] Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale [Abstract] Activity in securities available for sale: Unallocated Financing Receivables [Member] Unallocated Fair Value, by Balance Sheet Grouping [Table] Entity Address, State or Province Entity Address, State or Province Net change in short-term Federal Home Loan Bank advances Proceeds from (Repayments of) Short-Term Debt Proceeds from (Repayments of) Short-Term Debt, Total Data processing Information Technology and Data Processing Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding, Ending Balance Preferred Stock, Shares Outstanding, Beginning Balance Preferred stock, shares outstanding Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income Comprehensive income (loss) Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Securities available for sale, gross unrealized gains Interest Expense, Federal Home Loan Bank and Federal Reserve Bank Advances, Long-Term Interest on Federal Home Loan Bank advances Increase (Decrease) in Accrued Interest Receivable, Net Accrued interest receivable Internal Credit Assessment [Axis] Other general and administrative Other General and Administrative Expense Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive income (loss): Deferred Income Tax Assets, Net Net deferred tax asset Subsequent Event [Member] Subsequent Event Miscellaneous Miscellaneous Income Miscellaneous income. Held-to-maturity, over twelve months, gross unrealized loss Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Interest Expense, Operating Total interest expense Interest Income (Expense), after Provision for Loan Loss Net interest income, after provision (benefit) for credit losses Proceeds from Sale of Debt Securities, Available-for-Sale Sales Company sold of available for sale securities Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Held-to-maturity securities, within 1 year, fair value AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) Derivative Liability Derivative Liability, Total Derivative liabilities Derivative Liabilities Preferred Stock, Value, Issued Preferred stock, $.01 par value, 5,000,000 shares authorized, none outstanding Minimum [Member] Minimum Financial Instrument [Axis] Life Insurance, Corporate or Bank Owned, Change in Value Increase in cash surrender value of bank owned life insurance Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year Term loan by origination fiscal year before current fiscal year Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 Fair Value, Nonrecurring Fair Value, Nonrecurring [Member] Disclosure of accounting policy for reorganization. Reorganization Reorganization, Policy [Policy Text Block] Fair Value, Assets Measured on Recurring Basis [Table Text Block] Summary of Financial Instruments Measured at Fair Value on Recurring Basis Accrued interest reversed on non-accrual loans Accounts Receivable, Noncurrent, Nonaccrual, Interest Income Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Amortized Cost Available-for-sale securities, over 10 years, amortized cost Ending Balance Shares Beginning Balance Shares Shares, Outstanding Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Summary of the balances of loans Interest Expense, Operating and Nonoperating [Abstract] Interest expense: Commitments and Contingencies Commitments and contigencies Financing Receivable, Collectively Evaluated for Credit Loss Collectively evaluated loans Forecast [Member] Other Loans [Member] Other loans. Other Loans Total interest and dividend income Interest and Dividend Income, Operating Prior Financing Receivable, Originated, More than Five Years before Current Fiscal Year Interest Income (Expense), Operating Net interest income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total Net income Financing Receivable, before Allowance for Credit Loss Total Past Due Loans Total Securities held to maturity, amortized cost Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss Securities held to maturity, at amortized cost Securities held to maturity, amortized cost Financing Receivable, 90 Days or More Past Due, Still Accruing Accruing Loans 90 or More Days Past Due Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Basic, Total Average common shares outstanding, basic Scenario [Axis] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Available-for-sale, over twelve months, gross unrealized loss Interest Payable Accrued interest payable Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) Provision (benefit) for credit losses Tax effect Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Total Equity, Attributable to Parent Beginning Balance Value Ending Balance Value Total stockholders' equity Preferred Stock, Par or Stated Value Per Share Preferred stock, par value Basis of Accounting, Policy [Policy Text Block] Basis of Consolidation and Presentation Statement of Stockholders' Equity [Abstract] Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss Securities held to maturity, gross unrealized losses Gain on marketable equity securities, net Marketable Security, Gain (Loss) Marketable Security, Gain (Loss), Total Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss [Abstract] Securities Held to Maturity Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities Dilutive effect of securities Use of Estimates, Policy [Policy Text Block] Use of Estimates Allowance for Credit Losses-Loans Credit Loss, Financial Instrument [Policy Text Block] Internal Credit Assessment [Domain] Balance, beginning of period Balance, end of period Financing Receivable, Allowance for Credit Loss Allowance for credit losses Total allowance for loan losses Loans, net of allowance for credit losses Total allowance for credit losses Fair Value Disclosures [Text Block] Fair Values of Assets and Liabilities Payments to Acquire Held-to-Maturity Securities Purchases Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years Held-to-maturity securities, over 5 years through 10 years, amortized cost Accrued Liabilities and Other Liabilities Accrued expenses and other liabilities Derivative Instruments and Hedging Activities Disclosure [Abstract] Financial receivables greater than 90 days past due Financial Receivables Greater Than 90 Days Past Due [Member] Financial receivables greater than 90 days past due. Increase (Decrease) in Other Operating Assets Increase (Decrease) in Other Operating Assets, Total Other assets Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Entity [Domain] Debt Securities Debt Securities [Member] Debt Securities Available for Sale Held-to-maturity, less than twelve months, fair value Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value Term loan by origination current fiscal year Financing Receivable, Year One, Originated, Current Fiscal Year Cash and Due from Banks Cash and due from banks Cash and Due from Banks, Total Financing Receivable, Past Due [Table Text Block] Summary of Past Due and Non-Accrual Loans Regulatory Capital Requirements under Banking Regulations [Text Block] Minimum Regulatory Capital Requirements Entity Address, City or Town Entity Address, City or Town Interest Paid on Bank Advances Interest paid on bank advances. Interest paid on Federal Home Loan Bank advances Security Exchange Name Interest Expense, Deposits Interest Expense, Deposits, Total Interest on deposits Noninterest Expense [Abstract] Non-interest expense: Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income (loss) before income taxes Financing Receivable, Allowance for Credit Loss, Collectively Evaluated Allowance for collectively evaluated loans Watch [Member] Watch . 7 (Watch) Cash and cash equivalents at end of year Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total Cash and cash equivalents at beginning of year Interest Paid, Excluding Capitalized Interest, Operating Activity Interest paid on deposits Measurement Basis [Axis] Statistical Measurement [Domain] Document Period End Date Document Period End Date Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value Available-for-sale securities, over 10 years, fair value Fair Value Hierarchy and NAV [Domain] OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax Net unrealized gains (losses) Statement of Financial Position [Abstract] Cumulative effect of change in accounting principle Cumulative Effect, Period of Adoption, Adjustment [Member] Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Number of debt securities with unrealized losses Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Rolling after 10 Years, Fair Value Held-to-maturity securities, over 10 years, fair value Debt Securities, Available-for-Sale, Realized Gain (Loss) Debt Securities, Available-for-Sale, Realized Gain (Loss), Total Realized losses on securities Realized losses on securities Advance from Federal Home Loan Bank Advance from Federal Home Loan Bank, Total Federal Home Loan Bank advances Financial Asset, Aging [Domain] Increase (Decrease) in Deposits Increase (Decrease) in Deposits, Total Net increase in deposits Total liabilities Liabilities Financial Instruments [Domain] Derivative Liability, Statement of Financial Position [Extensible Enumeration] Derivative and Hedging Activities Derivative Instruments, Gain (Loss) [Line Items] Financing Receivable Credit Quality Indicators [Table Text Block] Summary of Bank's Risk Related Loans by Year of Origination and Gross Write-offs Available-for-sale, less than twelve months, gross unrealized loss Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number of Shares Outstanding, Diluted, Total Average common shares outstanding, diluted Entity File Number Entity File Number Marketing and Advertising Expense Marketing and Advertising Expense, Total Marketing and advertising Other Assets Other Assets, Total Other assets Cover [Abstract] Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Amortized Cost Available-for-sale securities, over 5 year through 10 years, amortized cost Schedule of Comparison of Carrying Amounts and Estimated Fair Value of Financial Instruments Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Cumulative Effect, Period of Adoption [Axis] Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Reclassification adjustment for losses realized in income Financial Asset, Aging [Axis] Investments [Domain] Deposit Liabilities, Collateral Issued, Financial Instruments Collateral in a deposit Scenario [Domain] Securities available for sale and marketable equity securities. Securities available for sale and marketable equity securities Securities Available For Sale And Marketable Equity Securities Proceeds from Maturities, Prepayments and Calls of Held-to-Maturity Securities Maturities, calls and prepayments Derivative, Term of Contract Weighted Average Maturity Accounts Receivable, Noncurrent, Accrued Interest, Writeoff Accrued interest write offs New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Pronouncements Held-to-maturity securities, over 1 year through 5 years, fair value Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Proceeds from FHLBank Borrowings, Financing Activities Proceeds from long-term Federal Home Loan Bank advances Construction Loans [Member] Construction Reported Value Measurement [Member] Carrying Amount Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Summary of Significant Accounting Policies Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common stock, shares outstanding Mortgagors' escrow accounts Advance Payments by Borrowers for Taxes and Insurance Document Transition Report Document Transition Report Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block] Allowance for Credit Losses- Off-Balance Sheet Credit Exposures Customer Service Fees Customer service fees. Customer service fees Securities held to maturity, at fair value Debt Securities, Held-to-Maturity, Fair Value Securities held to maturity Securities held to maturity, at fair value Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component Net periodic pension and post retirement benefit, less service costs Statement of Cash Flows [Abstract] Assets, Fair Value Disclosure [Abstract] Derivative Asset, Statement of Financial Position [Extensible Enumeration] Interest Rate Swap [Member] Interest Rate Swap on Investments Accounts and Financing Receivables [Table] Earnings Per Share [Text Block] Earnings Per Share (EPS) Net income applicable to common shares Net income Net income Winchester Bancorp, Mutual Holding Company [Member] Winchester Bancorp, Mutual Holding Company. Winchester Bancorp, MHC Aggregate Depreciation Percentage on Amortized Cost Basis Aggregate depreciation percentage on amortized cost basis. Aggregate depreciation percentage on amortized cost basis Available-for-Sale Securities, Debt Maturities [Abstract] Securities Available for Sale Provision for Loan, Lease, and Other Losses Provision for Loan, Lease, and Other Losses, Total Provision (benefit) for credit losses Provision for credit losses Assets Assets [Abstract] Federal Home Loan Bank Stock Federal Home Loan Bank stock, at cost Federal Home Loan Bank stock Document Fiscal Year Focus Document Fiscal Year Focus Held-to-maturity securities, over 5 year through 10 years, fair value Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Fair Value Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Cash flows from investing activities: Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Securities Equity Securities, FV-NI, Gain (Loss) Equity Securities, FV-NI, Gain (Loss), Total Net realized and unrealized gains (losses) recognized in earnings Gain (loss) on marketable equity securities, net Derivative, Basis Spread on Variable Rate Current SOFR Rate Received Unrealized Gain (Loss) on Investments [Table Text Block] Summary of Information Pertaining to Securities With Gross Unrealized Losses Fair Value Disclosures [Abstract] Derivatives and Hedging Derivatives, Methods of Accounting, Hedging Derivatives [Policy Text Block] Derivative Instrument [Axis] Financial Receivables Loans on Non Accruals [Member] Financial receivables loans on non accruals. Financial receivables loans on non accruals Assets, Fair Value Disclosure Total Assets measured at fair value Banking Regulation, Regulatory Capital Requirement, Compliance [Table] Net cash used by investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Pass [Member] 1-6 (Pass) Title of 12(b) Security Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivatives and Hedging Activities Debt Securities, Available-for-Sale, Allowance for Credit Loss, Beginning Balance Debt Securities, Available-for-Sale, Allowance for Credit Loss, Total Debt Securities, Available-for-Sale, Allowance for Credit Loss Debt Securities, Available-for-Sale, Allowance for Credit Loss, Ending Balance Available-for-sale, allowance for credit loss Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff Current-period gross write-offs , before current year Legal Entity [Axis] Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net change in: Winchester Savings Bank Charitable Foundation, Inc [Member] Winchester savings bank charitable foundation, inc. Winchester savings bank charitable foundation, inc. Minimum requirement, community bank leverage ratio Banking Regulation, Tier 1 Leverage Capital Ratio, Capital Adequacy, Minimum Fair Value, Recurring and Nonrecurring [Table] Additional Paid-in Capital [Member] Additional Paid in Capital Accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Measurement Frequency [Domain] Trading Symbol Equity Securities, FV-NI, Current Marketable equity securities Marketable equity securities, at fair value Subsequent Event Type [Axis] Financing Receivable, Allowance for Credit Loss [Table Text Block] Summary of Activity in the Allowance for Credit Losses and Total Loans, by Loan Segment Accrued interest receivable on loans Financing Receivable, Accrued Interest, before Allowance for Credit Loss Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Cash flows from financing activities: Fair Value, Recurring [Member] Fair Value, Recurring Entity Ex Transition Period Entity Ex Transition Period Stock Issued During Period, Value, Employee Stock Ownership Plan ESOP shares released and committed to be released Financing Receivable Portfolio Segment [Domain] Proceeds from Sale and Maturity of Held-to-Maturity Securities [Abstract] Activity in securities held to maturity: Interest and Dividend Income, Securities, Operating Interest and Dividend Income, Securities, Operating, Total Interest and dividends on securities Equity Components [Axis] Equity Component [Domain] Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Rolling within One Year Held-to-maturity securities, within 1 year, amortized cost Bank Owned Life Insurance Bank owned life insurance Derivative, Fair Value, Net Derivative, Fair Value, Net, Total Fair Value Depreciation, Depletion and Amortization, Nonproduction Depreciation, Depletion and Amortization, Nonproduction, Total Depreciation and amortization Loans, net Financing Receivable, after Allowance for Credit Loss Loans, net of allowance for credit losses of $4,537 at March 31, 2026 and $4,151 at June 30, 2025 Statement of Comprehensive Income [Abstract] Maximum Maximum [Member] Liabilities, Fair Value Disclosure Liabilities, Fair Value Disclosure, Total Liabilities measured at fair value Statistical Measurement [Axis] Common Stock, Value, Issued Common stock, $.01 par value, 20,000,000 shares authorized, 9,295,376 issued and outstanding as of March 31, 2026 and June 30, 2025 Deposit Insurance Expense Deposit insurance expense. Deposit insurance Derivative, Fixed Interest Rate Fixed Rate Paid Cash and Cash Equivalents [Abstract] Bank Owned Life Insurance Income Income on bank owned life insurance Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Net-of-tax amount Net-of-tax amount Marketable Securities [Line Items] Preferred stock, shares authorized Preferred Stock, Shares Authorized Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Interest-bearing deposits Interest-Bearing Deposit Liabilities Interest-Bearing Deposit Liabilities, Total Accounts, Notes, Loans and Financing Receivable [Line Items] Financing Receivable, Allowance for Credit Loss, Individually Evaluated Allowance for individually evaluated loans Entity Registrant Name Entity Registrant Name Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Securities available for sale, gross unrealized losses Increase Decrease In Mortgagors Escrow Accounts Increase decrease in mortgagors escrow accounts. Net increase in mortgagors' escrow accounts Additional Paid in Capital Additional Paid in Capital, Total Additional paid-in capital Liabilities and Surplus [Abstract] Liabilities and surplus. Liabilities and stockholders' equity Provision (benefit) for income taxes Income Tax Expense (Benefit) Income Tax Expense (Benefit), Total Debt Securities, Available-for-Sale, Gain (Loss) Debt Securities, Available-for-Sale, Gain (Loss), Total Losses on sale of securities available for sale, net Unearned compensation, ESOP shares Employee Stock Ownership Plan (ESOP), Number of Suspense Shares Balance, beginning of period Balance, end of period Off-Balance-Sheet, Credit Loss, Liability Measurement Frequency [Axis] Proceeds from Issuance of Common Stock Common stock proceeds Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Commercial loans Commercial Loan [Member] Commercial Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding U.S. Government Agency and U.S. Government-Sponsored Enterprise Obligations U S Government Agency and U S Government Sponsored Enterprise Obligations [Member] U S government agency and U S government sponsored enterprise obligations. Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated other comprehensive loss Payments of FHLBank Borrowings, Financing Activities Repayment of long-term Federal Home Loan Bank advances Assets Total assets Total assets Regulatory Capital Requirements [Abstract] Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] Class of Financing Receivable [Domain] Income Statement [Abstract] Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value Hierarchy Deferred Income Tax Expense (Benefit) Deferred Income Tax Expense (Benefit), Total Deferred tax provision Sale of Stock, Number of Shares Issued in Transaction Sale of shares of common stock in stock offering Sale of common stock shares Gain (Loss) on Sales of Loans, Net Gain (Loss) on Sales of Loans, Net, Total Gain on sale of loans Earnings Per Share, Diluted Earnings Per Share, Diluted, Total Net loss per share, diluted Net income per share, diluted City Area Code City Area Code Financing Receivable, Credit Loss, Expense (Reversal) Provision (benefit) for credit losses Commercial real estate Commercial Real Estate [Member] Financial Asset, Past Due [Member] Financial receivables past due Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, before Tax, Portion Attributable to Parent [Abstract] Securities available for sale: Interest and Fee Income, Loans and Leases Interest and Fee Income, Loans and Leases, Total Interest and fees on loans Asset Derivatives Fair Value Derivative Instruments in Hedges, Assets, at Fair Value Financing Receivable, Unamortized Loan Cost (Fee) Net deferred loan origination costs Weighted Average Number of Shares, Employee Stock Ownership Plan Shares Not Committed to be Released Less: average unallocated ESOP shares Derivative Liabilities Derivative Liabilities [Member] Derivative liabilities. Property, Plant and Equipment, Net Property, Plant and Equipment, Net, Total Premises and equipment, net Retained Earnings [Member] Retained Earnings and Surplus Change in Accounting Principle, Indirect Effect [Domain] Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Available-for-sale, less than twelve months, fair value Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after 5 through 10 Years, Fair Value Available-for-sale securities, over 5 years through 10 years, fair value Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 Payments for (Proceeds from) Federal Home Loan Bank Stock Payments for (Proceeds from) Federal Home Loan Bank Stock, Total Redemption (purchase) of Federal Home Loan Bank stock Net cash provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year Term loan by origination three years before current fiscal year Marketable Securities [Table Text Block] Summary of Amortized Cost and Fair Value of Available for Sale and Held to Maturity Securities Derivative Contract [Domain] Unearned ESOP Shares Unearned compensation (ESOP) Unearned compensation (ESOP) Corporate Bonds and Obligations Corporate Debt Securities [Member] Entity Interactive Data Current Entity Interactive Data Current Fair Value Measurement [Domain] Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Cash flows from operating activities: Loss on Available for Sale Securities Net Loss on available for sale securities net. Loss on available for sale securities, net Loss on available for sale securities, net Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff Current-period gross write-offs , two years before current year Cumulative Effect, Period of Adoption [Domain] Entity Tax Identification Number Entity Tax Identification Number Maturities, calls and prepayments Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Occupancy, Net Occupancy and equipment, net Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Loans Local Phone Number Local Phone Number Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Fair value of the Company's Derivative Financial Instrument Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Available-for-sale securities, over 1 year through 5 years, fair value Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Available-for-sale securities, within 1 year, fair value Noninterest Expense Total non-interest expense Consumer Loan [Member] Consumer loans Consumer Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost Available-for-sale securities, within 1 year, amortized cost Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, Rolling after One through Five Years Held-to-maturity securities, over 1 year through 5 years, amortized cost Labor and Related Expense Salaries and employee benefits Entity Emerging Growth Company Entity Emerging Growth Company