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Note 4 - Debt and Equity Securities (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Note 4 - Debt and Equity Securities (Details) [Line Items]      
Trading Securities $ 0us-gaap_TradingSecurities   $ 0us-gaap_TradingSecurities
Held-to-maturity Securities 0us-gaap_HeldToMaturitySecurities   0us-gaap_HeldToMaturitySecurities
Mortgage Backed Securities Available For Sale, Amortized Cost 708,314,000ffic_MortgageBackedSecuritiesAvailableForSaleAmortizedCost    
Proceeds from Sale of Available-for-sale Securities 0us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities 0us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities  
Corporate Debt Securities [Member]      
Note 4 - Debt and Equity Securities (Details) [Line Items]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 6us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
   
Municipal [Member]      
Note 4 - Debt and Equity Securities (Details) [Line Items]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 2us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_MunicipalMember
   
Single Issuer Trust Preferred Security [Member]      
Note 4 - Debt and Equity Securities (Details) [Line Items]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_SingleIssuerTrustPreferredSecurityMember
   
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_SingleIssuerTrustPreferredSecurityMember
   
REMIC And CMO [Member] | FHLMC [Member]      
Note 4 - Debt and Equity Securities (Details) [Line Items]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 6us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ invest_InvestmentIssuerAxis
= ffic_FHLMCMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_REMICAndCMOMember
   
REMIC And CMO [Member] | FNMA [Member]      
Note 4 - Debt and Equity Securities (Details) [Line Items]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 10us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ invest_InvestmentIssuerAxis
= ffic_FNMAMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_REMICAndCMOMember
   
REMIC And CMO [Member] | GNMA [Member]      
Note 4 - Debt and Equity Securities (Details) [Line Items]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 6us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ invest_InvestmentIssuerAxis
= ffic_GNMAMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_REMICAndCMOMember
   
REMIC And CMO [Member] | Private Issues [Member]      
Note 4 - Debt and Equity Securities (Details) [Line Items]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ invest_InvestmentIssuerAxis
= ffic_PrivateIssuesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_REMICAndCMOMember
   
REMIC And CMO [Member]      
Note 4 - Debt and Equity Securities (Details) [Line Items]      
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_REMICAndCMOMember
   
GNMA [Member]      
Note 4 - Debt and Equity Securities (Details) [Line Items]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_GNMAMember
   
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_GNMAMember
   
FNMA [Member]      
Note 4 - Debt and Equity Securities (Details) [Line Items]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 9us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_FNMAMember
   
Collateralized By Commercial Real Estate [Member] | Collateralized Mortgage Obligations [Member]      
Note 4 - Debt and Equity Securities (Details) [Line Items]      
Private Issue Collateralized Mortgage Obligations, Number 3ffic_PrivateIssueCollateralizedMortgageObligationsNumber
/ ffic_CollateralTypeAxis
= ffic_CollateralizedByCommercialRealEstateMember
/ us-gaap_DebtSecurityAxis
= us-gaap_CollateralizedMortgageObligationsMember
  3ffic_PrivateIssueCollateralizedMortgageObligationsNumber
/ ffic_CollateralTypeAxis
= ffic_CollateralizedByCommercialRealEstateMember
/ us-gaap_DebtSecurityAxis
= us-gaap_CollateralizedMortgageObligationsMember
Mortgage Backed Securities Available For Sale, Amortized Cost $ 12,400,000ffic_MortgageBackedSecuritiesAvailableForSaleAmortizedCost
/ ffic_CollateralTypeAxis
= ffic_CollateralizedByCommercialRealEstateMember
/ us-gaap_DebtSecurityAxis
= us-gaap_CollateralizedMortgageObligationsMember
  $ 12,400,000ffic_MortgageBackedSecuritiesAvailableForSaleAmortizedCost
/ ffic_CollateralTypeAxis
= ffic_CollateralizedByCommercialRealEstateMember
/ us-gaap_DebtSecurityAxis
= us-gaap_CollateralizedMortgageObligationsMember