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Note 12 - Pension and Other Postretirement Benefit Plans (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 1995
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets |  |  |  |
Equity Securities [Member] | Minimum [Member] | Retirement Plan [Member] | Savings Bank [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets | 8.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Equity Securities [Member] | Maximum [Member] | Retirement Plan [Member] | Savings Bank [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets | 10.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Equity Securities [Member] | Retirement Plan [Member] | Savings Bank [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 60.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |  |  |
Fixed Income Securities [Member] | Minimum [Member] | Retirement Plan [Member] | Savings Bank [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets | 3.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedIncomeSecuritiesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Fixed Income Securities [Member] | Maximum [Member] | Retirement Plan [Member] | Savings Bank [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets | 5.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedIncomeSecuritiesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Fixed Income Securities [Member] | Retirement Plan [Member] | Savings Bank [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 40.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedIncomeSecuritiesMember |  |  |
Trust for Benefit of Employees [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Full Time Employment Years of Service | 1 year |  |  |
Amount Borrowed From the Company by the Employee Benefit Trust (in Dollars) |  |  |  | $ 7,900,000 ffic_AmountBorrowedFromTheCompanyByTheEmployeeBenefitTrust / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_TrustForBenefitOfEmployeesMember
Stock Issued During Period, Value, Employee Benefit Plan (in Dollars) |  |  |  | 7,000 us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_TrustForBenefitOfEmployeesMember
Stock Issued During Period, Shares, Employee Benefit Plan (in Shares) |  |  |  | 2,328,750 us-gaap_StockIssuedDuringPeriodSharesEmployeeBenefitPlan / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_TrustForBenefitOfEmployeesMember
Employer Contributions to the 401(k) and Profit Sharing Plans Funded By the Employee Benefit Trust (in Dollars) | 2,700,000 ffic_EmployerContributionsToThe401kAndProfitSharingPlansFundedByTheEmployeeBenefitTrust / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_TrustForBenefitOfEmployeesMember | 2,300,000 ffic_EmployerContributionsToThe401kAndProfitSharingPlansFundedByTheEmployeeBenefitTrust / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_TrustForBenefitOfEmployeesMember | 2,100,000 ffic_EmployerContributionsToThe401kAndProfitSharingPlansFundedByTheEmployeeBenefitTrust / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_TrustForBenefitOfEmployeesMember |
U.S. large-cap growth [Member] | Minimum [Member] | Retirement Plan [Member] | Savings Bank [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Number of Stocks Held in Portfolio | 55 ffic_NumberOfStocksHeldInPortfolio / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = ffic_USLargeCapGrowthMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
U.S. large-cap growth [Member] | Maximum [Member] | Retirement Plan [Member] | Savings Bank [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Number of Stocks Held in Portfolio | 70 ffic_NumberOfStocksHeldInPortfolio / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = ffic_USLargeCapGrowthMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
U.S. Small-Cap Blend [Member] | Minimum [Member] | Retirement Plan [Member] | Savings Bank [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Number of Stocks Held in Portfolio | 40 ffic_NumberOfStocksHeldInPortfolio / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = ffic_USSmallCapBlendMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
U.S. Small-Cap Blend [Member] | Maximum [Member] | Retirement Plan [Member] | Savings Bank [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Number of Stocks Held in Portfolio | 100 ffic_NumberOfStocksHeldInPortfolio / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = ffic_USSmallCapBlendMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
U.S. Small-Cap Blend [Member] | Retirement Plan [Member] | Savings Bank [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Pension Plan Assets, Equity Securities Held in Mutual Funds, Minimum Market Capitalization (in Dollars) | 100,000,000 ffic_PensionPlanAssetsEquitySecuritiesHeldInMutualFundsMinimumMarketCapitalization / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = ffic_USSmallCapBlendMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember |  |  |
International blend [Member] | Minimum [Member] | Retirement Plan [Member] | Savings Bank [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Number of Stocks Held in Portfolio | 80 ffic_NumberOfStocksHeldInPortfolio / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = ffic_InternationalBlendMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
International blend [Member] | Maximum [Member] | Retirement Plan [Member] | Savings Bank [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Number of Stocks Held in Portfolio | 90 ffic_NumberOfStocksHeldInPortfolio / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = ffic_InternationalBlendMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
In Event of Termination [Member] | Less Than [Member] | Directors' Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Full Time Employment Years of Service | 2 years |  |  |
In Event of Termination [Member] | Directors' Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Full Time Employment Years of Service | 2 years |  |  |
Defined Benefit Contributions, Months of Benefit Used In Lump Sum Payment | 120 months |  |  |
Minimum [Member] | Retirement Plan [Member] | Savings Bank [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets | 8.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Minimum [Member] | Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Service Period | 3 years |  |  |
Maximum [Member] | Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Service Period | 10 years |  |  |
Retirement Plan [Member] | Savings Bank [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Contributions by Employer (in Dollars) |  | 800,000 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember | 700,000 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember |
Defined Benefit Plan, Benefit Obligation (in Dollars) | 24,100,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember | 19,700,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember |  |
Retirement Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Contributions by Employer (in Dollars) |  | 831,000 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember |  |
Defined Benefit Plan, Benefit Obligation (in Dollars) | 24,097,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember | 19,740,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember | 22,531,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets | 7.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember | 7.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember | 7.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember |
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months (in Dollars) | 1,094,000 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_RetirementPlanMember |  |  |
Postretirement Plans [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Contributions by Employer (in Dollars) | 49,000 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_PostretirementPlansMember | 66,000 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_PostretirementPlansMember |  |
Defined Benefit Plan, Benefit Obligation (in Dollars) | 8,073,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_PostretirementPlansMember | 5,586,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_PostretirementPlansMember | 5,927,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_PostretirementPlansMember |
Number of Unfunded Postretirement Benefit Plans | 2 ffic_NumberOfUnfundedPostretirementBenefitPlans / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_PostretirementPlansMember |  |  |
Full Time Employment Years of Service | 5 years |  |  |
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months (in Dollars) | 181,000 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_PostretirementPlansMember |  |  |
Postretirement Plan 1 [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Cost Sharing Arrangement, Medical Benefits, Percentage | 50.00%ffic_CostSharingArrangementMedicalBenefitsPercentage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_PostretirementPlan1Member |  |  |
Medical Premiums, Required Percentage to Be Paid By Spouses of Future Retirees | 100.00%ffic_MedicalPremiumsRequiredPercentageToBePaidBySpousesOfFutureRetirees / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_PostretirementPlan1Member |  |  |
401(k) [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Contribution Plan Service Period Requirement | 1 year |  |  |
Directors' Plan [Member] | Savings Bank [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Benefit Obligation (in Dollars) | 2,700,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_DirectorsPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember | 2,700,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_DirectorsPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember |  |
Annual Retirement Benefit Paid to Terminating Eligible Directors (in Dollars) | 48,000 ffic_AnnualRetirementBenefitPaidToTerminatingEligibleDirectors / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_DirectorsPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember |  |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year (in Dollars) | 288,000 us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_DirectorsPlanMember / dei_LegalEntityAxis = ffic_SavingsBankMember |  |  |
Directors' Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Benefit Plan, Contributions by Employer (in Dollars) | 120,000 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_DirectorsPlanMember | 98,000 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_DirectorsPlanMember |  |
Defined Benefit Plan, Benefit Obligation (in Dollars) | 2,663,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_DirectorsPlanMember | 2,666,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_DirectorsPlanMember | 2,706,000 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_DirectorsPlanMember |
Full Time Employment Years of Service | 5 years |  |  |
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months (in Dollars) | 288,000 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = ffic_DirectorsPlanMember |  |  |
401(k) [Member] | Savings Bank [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Contribution Plan Annual Employer Matching Of Employee's Contribution Percent | 50.00%ffic_DefinedContributionPlanAnnualEmployerMatchingOfEmployeesContributionPercent / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = ffic_Four01kMember / dei_LegalEntityAxis = ffic_SavingsBankMember |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 3.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = ffic_Four01kMember / dei_LegalEntityAxis = ffic_SavingsBankMember |  |  |
401(k) [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage | 20.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = ffic_Four01kMember |  |  |
Defined Contribution Plan, Vesting Period | 5 years |  |  |
Defined Contribution Plan, Employers Matching Contribution, Vesting Percentage Upon Change of Control | 100.00%ffic_DefinedContributionPlanEmployersMatchingContributionVestingPercentageUponChangeOfControl / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = ffic_Four01kMember |  |  |
Defined Contribution Plan, Cost Recognized (in Dollars) | 3,100,000 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = ffic_Four01kMember | 2,900,000 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = ffic_Four01kMember | 2,400,000 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = ffic_Four01kMember |
Defined Contribution Retirement Plan ("DCRP") [Member] | Savings Bank [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 4.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = ffic_DefinedContributionRetirementPlanDCRPMember / dei_LegalEntityAxis = ffic_SavingsBankMember |  |  |
Non-Qualified Deferred Compensation Plan [Member] |  |  |  |
Note 12 - Pension and Other Postretirement Benefit Plans (Details) [Line Items] |  |  |  |
Defined Contribution Plan Annual Employer Matching Of Employee's Contribution Percent | 50.00%ffic_DefinedContributionPlanAnnualEmployerMatchingOfEmployeesContributionPercent / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = ffic_NonQualifiedDeferredCompensationPlanMember |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 5.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = ffic_NonQualifiedDeferredCompensationPlanMember |  |  |
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage | 20.00%us-gaap_DefinedContributionPlanEmployersMatchingContributionAnnualVestingPercentage / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = ffic_NonQualifiedDeferredCompensationPlanMember |  |  |
Defined Contribution Plan, Vesting Period | 5 years |  |  |
Defined Contribution Plan, Employers Matching Contribution, Vesting Percentage Upon Change of Control | 100.00%ffic_DefinedContributionPlanEmployersMatchingContributionVestingPercentageUponChangeOfControl / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = ffic_NonQualifiedDeferredCompensationPlanMember |  |  |
Defined Contribution Plan, Cost Recognized (in Dollars) | $ 400,000 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = ffic_NonQualifiedDeferredCompensationPlanMember | $ 400,000 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = ffic_NonQualifiedDeferredCompensationPlanMember | $ 400,000 us-gaap_DefinedContributionPlanCostRecognized / us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsByTypeOfDeferredCompensationAxis = ffic_NonQualifiedDeferredCompensationPlanMember |

X
- Definition Amount borrowed from the company by the Employee Benefit Trust. + References No definition available. + Details
Name: | ffic_AmountBorrowedFromTheCompanyByTheEmployeeBenefitTrust
Namespace Prefix: | ffic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Annual retirement benefit paid to terminating eligible directors. + References No definition available. + Details
Name: | ffic_AnnualRetirementBenefitPaidToTerminatingEligibleDirectors
Namespace Prefix: | ffic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of the cost sharing arrangement relating to medical benefits under a postretirement plan. + References No definition available. + Details
Name: | ffic_CostSharingArrangementMedicalBenefitsPercentage
Namespace Prefix: | ffic_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined benefit contributions, months of benefit used in lump sum payment. + References No definition available. + Details
Name: | ffic_DefinedBenefitContributionsMonthsOfBenefitUsedInLumpSumPayment
Namespace Prefix: | ffic_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition Percentage of employer's matching contributions to a defined contribution plan that vests due to a change of control (as defined in the applicable plan). + References No definition available. + Details
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- Definition Employer contributions to the 401(k) and profit sharing plans funded by the Employee Benefit Trust. + References No definition available. + Details
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- Definition Number of unfunded postretirement benefit plans. + References No definition available. + Details
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- Definition Represents the minimum market capitalization of equity securities held in a particular mutual fund for pension plan assets. + References No definition available. + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512013 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920 + Details
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