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Note 6 - Debt and Equity Securities (Details) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2015
Mar. 31, 2014
Note 6 - Debt and Equity Securities (Details) [Line Items]          
Private Issue Collateralized Mortgage Obligations, Number 3ffic_PrivateIssueCollateralizedMortgageObligationsNumber        
Mortgage Backed Securities Available For Sale, Amortized Cost (in Dollars) $ 702,530,000ffic_MortgageBackedSecuritiesAvailableForSaleAmortizedCost        
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars)   1,419,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities 3,138,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities    
Texas Ratio, Minimum Review Threshold 50.00%ffic_TexasRatioMinimumReviewThreshold        
Corporate Debt Securities [Member]          
Note 6 - Debt and Equity Securities (Details) [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 5us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
       
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars)   0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
     
Municipal [Member]          
Note 6 - Debt and Equity Securities (Details) [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 3us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_MunicipalMember
33us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_MunicipalMember
     
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_MunicipalMember
0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_MunicipalMember
     
Single Issuer Trust Preferred Security [Member]          
Note 6 - 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
       
Trust Preferred Securities [Member] | Private Issues [Member]          
Note 6 - Debt and Equity Securities (Details) [Line Items]          
Fair Value Inputs, Probability of Default 0.00%us-gaap_FairValueInputsProbabilityOfDefault
/ invest_InvestmentIssuerAxis
= ffic_PrivateIssuesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_TrustPreferredSecuritiesMember
       
Trust Preferred Securities [Member] | Single Issuer [Member]          
Note 6 - 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_SingleIssuerMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_TrustPreferredSecuritiesMember
1us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ invest_InvestmentIssuerAxis
= ffic_SingleIssuerMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_TrustPreferredSecuritiesMember
     
Fair Value Inputs, Probability of Default 25.00%us-gaap_FairValueInputsProbabilityOfDefault
/ invest_InvestmentIssuerAxis
= ffic_SingleIssuerMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_TrustPreferredSecuritiesMember
       
Trust Preferred Securities [Member]          
Note 6 - Debt and Equity Securities (Details) [Line Items]          
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars)   0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_TrustPreferredSecuritiesMember
     
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number Of Instruments, OTTI Charge Recorded 3ffic_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfInstrumentsOTTIChargeRecorded
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_TrustPreferredSecuritiesMember
       
Proceeds from Sale of Available-for-sale Securities (in Dollars) 11,100,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_TrustPreferredSecuritiesMember
       
Available-for-sale Securities, Gross Realized Losses (in Dollars) 2,300,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_TrustPreferredSecuritiesMember
       
REMIC And CMO [Member] | FHLMC [Member]          
Note 6 - Debt and Equity Securities (Details) [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 7us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ invest_InvestmentIssuerAxis
= ffic_FHLMCMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_REMICAndCMOMember
       
REMIC And CMO [Member] | FNMA [Member]          
Note 6 - Debt and Equity Securities (Details) [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 14us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ invest_InvestmentIssuerAxis
= ffic_FNMAMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_REMICAndCMOMember
       
REMIC And CMO [Member] | GNMA [Member]          
Note 6 - Debt and Equity Securities (Details) [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 8us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ invest_InvestmentIssuerAxis
= ffic_GNMAMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_REMICAndCMOMember
       
REMIC And CMO [Member] | Private Issues [Member]          
Note 6 - 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
       
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars)   1,400,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ invest_InvestmentIssuerAxis
= ffic_PrivateIssuesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_REMICAndCMOMember
800,000us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ invest_InvestmentIssuerAxis
= ffic_PrivateIssuesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_REMICAndCMOMember
   
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number Of Instruments, OTTI Charge Recorded   4ffic_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfInstrumentsOTTIChargeRecorded
/ invest_InvestmentIssuerAxis
= ffic_PrivateIssuesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_REMICAndCMOMember
5ffic_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfInstrumentsOTTIChargeRecorded
/ invest_InvestmentIssuerAxis
= ffic_PrivateIssuesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_REMICAndCMOMember
   
REMIC And CMO [Member]          
Note 6 - Debt and Equity Securities (Details) [Line Items]          
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_REMICAndCMOMember
       
Collateralized Mortgage Backed Securities [Member]          
Note 6 - Debt and Equity Securities (Details) [Line Items]          
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesMember
       
Collateralized Mortgage Obligations [Member]          
Note 6 - Debt and Equity Securities (Details) [Line Items]          
Proceeds from Sale of Available-for-sale Securities (in Dollars)   18,300,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
     
Available-for-sale Securities, Gross Realized Losses (in Dollars)   1,700,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedMortgageObligationsMember
     
GNMA [Member]          
Note 6 - 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 (in Dollars) 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_GNMAMember
       
FNMA [Member]          
Note 6 - Debt and Equity Securities (Details) [Line Items]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 13us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_FNMAMember
       
FHLMC [Member]          
Note 6 - 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_FHLMCMember
       
Pooled Trust Preferred Securities [Member] | Scenario, Forecast [Member]          
Note 6 - Debt and Equity Securities (Details) [Line Items]          
Discounted Cash Flow Analysis, Significant Assumptions, Issuers that Prepay, Number       2ffic_DiscountedCashFlowAnalysisSignificantAssumptionsIssuersThatPrepayNumber
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_PooledTrustPreferredSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
 
Discounted Cash Flow Analysis, Significant Assumptions, Prepayment Amount (in Dollars)       21,500,000ffic_DiscountedCashFlowAnalysisSignificantAssumptionsPrepaymentAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_PooledTrustPreferredSecuritiesMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
 
Pooled Trust Preferred Securities [Member]          
Note 6 - 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_PooledTrustPreferredSecuritiesMember
     
Discounted Cash Flow Analysis, Significant Assumptions, Issuers that Prepay, Number         2ffic_DiscountedCashFlowAnalysisSignificantAssumptionsIssuersThatPrepayNumber
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_PooledTrustPreferredSecuritiesMember
Discounted Cash Flow Analysis, Significant Assumptions, Prepayment Amount (in Dollars)         26,700,000ffic_DiscountedCashFlowAnalysisSignificantAssumptionsPrepaymentAmount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_PooledTrustPreferredSecuritiesMember
Trust Preferred Security Settled at Less than Amortized Cost [Member] | Single Issuer [Member]          
Note 6 - 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_SingleIssuerMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= ffic_TrustPreferredSecuritySettledAtLessThanAmortizedCostMember
     
Pooled Trust Preferred Security Settled at Less than Amortized Cost [Member]          
Note 6 - 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_PooledTrustPreferredSecuritySettledAtLessThanAmortizedCostMember
     
Collateralized By Commercial Real Estate [Member] | Collateralized Mortgage Obligations [Member]          
Note 6 - Debt and Equity Securities (Details) [Line Items]          
Mortgage Backed Securities Available For Sale, Amortized Cost (in Dollars) 12,400,000ffic_MortgageBackedSecuritiesAvailableForSaleAmortizedCost
/ ffic_CollateralTypeAxis
= ffic_CollateralizedByCommercialRealEstateMember
/ us-gaap_DebtSecurityAxis
= us-gaap_CollateralizedMortgageObligationsMember
13,900,000ffic_MortgageBackedSecuritiesAvailableForSaleAmortizedCost
/ ffic_CollateralTypeAxis
= ffic_CollateralizedByCommercialRealEstateMember
/ us-gaap_DebtSecurityAxis
= us-gaap_CollateralizedMortgageObligationsMember
     
Collateralized Mortgage Obligations [Member]          
Note 6 - Debt and Equity Securities (Details) [Line Items]          
Private Issue Collateralized Mortgage Obligations, Number   2ffic_PrivateIssueCollateralizedMortgageObligationsNumber
/ ffic_CollateralTypeAxis
= us-gaap_CollateralizedMortgageObligationsMember
     
FHLMC [Member]          
Note 6 - Debt and Equity Securities (Details) [Line Items]          
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ invest_InvestmentIssuerAxis
= ffic_FHLMCMember
       
FNMA [Member]          
Note 6 - Debt and Equity Securities (Details) [Line Items]          
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) $ 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ invest_InvestmentIssuerAxis
= ffic_FNMAMember