Document and Entity Information [Abstract] Document Information [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Represents the Retirement Plan being EBP 002. E B P 002 [Member] EBP 002 Document Information [Line Items] Document Type Document Period End Date Entity Registrant Name Entity Central Index Key Amendment Flag Statements of Net Assets Available for Benefits EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] Statements of Net Assets Available for Benefits EBP, Asset [Abstract] Assets: EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Total investment assets at fair value Flushing Financial Corporation common stock value EBP, Investment, Excluding Plan Interest in Master Trust, Contract Value Investments, at contract value EBP, Investment, Fair and Contract Value Total investments EBP, Receivable [Abstract] Receivables: EBP, Employer Contribution, Receivable Employer contributions receivable EBP, Note Receivable from Participant Notes receivable from participants EBP, Receivable Total receivables EBP, Net Asset Available for Benefit Net assets available for benefits - December 31, 2025 Net assets available for benefits - December 31, 2024 Net assets available for benefits Statement of Changes in Net Assets Available for Benefits EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Change in Net Asset Available for Benefit, Increase (Decrease) [Abstract] Additions: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Unrealized Gain (Loss) on Investment Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment Dividends and interest EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment Total investment income EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Interest income on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Employer contributions EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Participant contributions EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Participant rollovers EBP, Change in Net Asset Available for Benefit, Increase from Contribution Total contributions EBP, Change in Net Asset Available for Benefit, Increase Total additions EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Deductions: EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Benefits paid to participants EBP, Change in Net Asset Available for Benefit, Decrease Total deductions EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Net increase Description of the Plan: EBP, Description of Plan [Table] EBP, Description of Plan [Line Items] Description of the Plan: Plan Termination: EBP, Description of Plan [Text Block] Description of the Plan: Summary of Significant Accounting Policies: EBP, Accounting Policy [Table] EBP, Accounting Policy [Line Items] Summary of Significant Accounting Policies: EBP, Summary of Accounting Policy [Text Block] Summary of Significant Accounting Policies: Fair Value Measurements: EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Line Items] Fair Value Measurements: EBP, Investment, Fair Value and NAV [Text Block] Fair Value Measurements: Fully Benefit-Responsive Investment Contracts: EBP, Fully Benefit-Responsive Investment Contract [Table] EBP, Fully Benefit-Responsive Investment Contract [Text Block] Fully Benefit-Responsive Investment Contracts: Risks and Uncertainties: EBP, Risk and Uncertainty [Table] EBP, Risk and Uncertainty [Text Block] Risks and Uncertainties: No definition available. Plan Termination: EBP, Plan Termination [Text Block] Plan Termination: Federal Tax Status: EBP, Tax Status [Table] EBP, Tax Status [Line Items] Federal Tax Status: EBP, Tax Status [Text Block] Federal Tax Status: Related Party Transactions and Parties-in-Interest: EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Line Items] Related Party Transactions and Parties-in-Interest: EBP, Related Party and Party-in-Interest Transactions [Text Block] Related Party Transactions and Parties-in-Interest: Subsequent Events: EBP, Subsequent Event [Table] EBP, Subsequent Event [Line Items] Subsequent Events: EBP, Subsequent Event [Text Block] Subsequent Events: Schedule H (Form 5500), line 4i - Schedule of Assets (Held at End of Year) EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Line Items] Schedule H (Form 5500), line 4i - Schedule of Assets (Held at End of Year) EBP, Schedule of Asset Held for Investment [Text Block] Schedule H (Form 5500), line 4i - Schedule of Assets (Held at End of Year) EBP, Basis of Accounting [Policy Text Block] Basis of presentation: EBP, Use of Estimate [Policy Text Block] Use of estimates: Disclosure of accounting policy for income recognition and investment valuation held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Investment Valuation and Income Recognition [Policy Text Block] Investment valuation and income recognition: EBP, Contribution [Policy Text Block] Contributions receivable: EBP, Note Receivable from Participant [Policy Text Block] Notes receivable from participants: EBP, Expense [Policy Text Block] Expenses: EBP, Payment to Participant [Policy Text Block] Payment of benefits: EBP, Investment, Fair Value and NAV [Table Text Block] Schedule of Plan's assets that are carried at fair value on a recurring basis EBP, Contribution, Participating Employer [Axis] EBP, Contribution, Participating Employer [Domain] Represents the information pertaining to Profit sharing contributions. EBP, Contribution, Profit Sharing [Member] Profit Sharing (PS) contributions Represents the information pertaining to Defined Contribution Retirement Plan (DCRP) contributions. EBP, Contribution, Defined Contribution Retirement Plan [Member] Defined Contribution Retirement Plan (DCRP) contributions Scenario [Axis] Scenario [Domain] Represents the information pertaining to per year of credit service. Per Year Of Credited Services [Member] Per year of credited service Represents the information pertaining to after 5 years of credited services. After 5 Years Of Credited Services [Member] After 5 years of credited services Represents the information pertaining to acquisition of principal residence. Acquisition Of Principal Residence [Member] Acquire principal residence Statistical Measurement [Axis] Statistical Measurement [Domain] Maximum [Member] Maximum Minimum [Member] Minimum EBP, Employer Contribution, Matching Percentage Employer's matching contribution (in %) EBP, Employer Contribution, Participant Compensation Matched, Percentage Maximum participant's compensation matched by employer (in %) Represents the minimum service period for plan eligibility under (employee benefit plan (EBP)). Employee Benefit Plan, Minimum Service Period For Plan Eligibility Minimum service period for plan eligibility (in year) Represents the percentage of vesting. Employee Benefit Plan, Vesting Percentage Vesting percentage in the event of termination or partial termination of the Plan Plan vesting percentage (%) Represents the period of vesting. Employee Benefit Plan, Vesting Period Vesting period EBP, Forfeited Nonvested Account Forfeited non-vested accounts EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Amount of forfeited nonvested accounts used to offset employer contributions Represents the minimum increment percentage by which participants may allocate their contributions among the investment options offered under the Plan. E B P, Participant Investment Election Percentage Participant investment election Increment percent (in %) Represents the vested account balance threshold under the Plan at which an automatic lumpsum distribution is made to a participant upon termination of employment for reasons other than death, disability, or retirement. E B P, Automatic Distribution Threshold Amount Automatic distribution threshold amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Maximum borrowing to total account (in %) EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Maximum borrowing amount Represents the maximum borrowing term of the loan. E B P, Note Receivable from Participant, Loan, Maximum Borrowing Term Maximum borrowing term of the loan (in years) Percentage points added to the reference rate to compute the variable rate on the participant loans. Employee Benefit Plan, Participants Loans, Basis Spread On Variable Rate Interest rate spread over prime rate (in %) EBP, Asset Held for Investment, Participant Loan, Interest Rate Notes Receivable from Participants, interest rate Investment Type [Axis] Investments [Domain] Mutual Fund [Member] Mutual funds Mutual Funds EBP, Employer, Common Stock [Member] Company common stock Company Stock EBP, Pooled Separate Account [Member] Pooled Separate Accounts Common Collective Trust [Member] Common collective trust Common Collective Trust Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] EBP, Fair Value, Investment, NAV, Unfunded Commitment Unfunded commitments relating to the Plan's investments Represents the information pertaining to contribution receivables. Contribution Receivables [Member] Contribution receivables Represents the information pertaining to funds issued by Empower Annuity Insurance Company of America. Funds Issued By Empower Annuity Insurance Company of America [Member] Funds issued by Empower Annuity Insurance Company of America EBP, Risk and Uncertainty, Concentration of Investment at Fair Value to Net Assets, Percentage Percentage of Plan's net assets to investments EBP, Tax Determination Letter, Obtained [true false] Determination letter obtained EBP, Tax Determination Letter, Date Determination letter date EBP, Tax Qualification Status [Extensible Enumeration] Tax qualification status EBP, Investment, Number of Shares Number of shares held EBP, Investment, Purchased, Number of Shares Number of shares purchased EBP, Investment, Sold, Number of Shares Number of shares sold Investment, Identifier [Axis] EBP, Plan Number Plan number EBP, Investment, Issuer Name [Extensible Enumeration] Investment issuer name EBP, Investment, Current Value, Type [Extensible Enumeration] Investment type EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Current Value EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Notes Receivable from Participants EBP, Asset Held for Investment Total EBP, Asset Held for Investment, Party-in-Interest [true false] Investment party in interest EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] Investment participation status