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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 | 3 ffic_PrivateIssueCollateralizedMortgageObligationsNumber |  |  |  |
Mortgage Backed Securities Available For Sale, Amortized Cost (in Dollars) | $ 702,530,000 ffic_MortgageBackedSecuritiesAvailableForSaleAmortizedCost |  |  |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) |  | 1,419,000 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities | 3,138,000 us-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 | 5 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CorporateDebtSecuritiesMember |  |  |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) |  | 0 us-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 | 3 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_MunicipalMember | 33 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_MunicipalMember |  |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_MunicipalMember | 0 us-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 | 1 us-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 | 1 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 / invest_InvestmentIssuerAxis = ffic_SingleIssuerMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_TrustPreferredSecuritiesMember | 1 us-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) |  | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_TrustPreferredSecuritiesMember |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number Of Instruments, OTTI Charge Recorded | 3 ffic_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfInstrumentsOTTIChargeRecorded / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_TrustPreferredSecuritiesMember |  |  |  |
Proceeds from Sale of Available-for-sale Securities (in Dollars) | 11,100,000 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_TrustPreferredSecuritiesMember |  |  |  |
Available-for-sale Securities, Gross Realized Losses (in Dollars) | 2,300,000 us-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 | 7 us-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 | 14 us-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 | 8 us-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 | 1 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 / invest_InvestmentIssuerAxis = ffic_PrivateIssuesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_REMICAndCMOMember |  |  |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) |  | 1,400,000 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities / invest_InvestmentIssuerAxis = ffic_PrivateIssuesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_REMICAndCMOMember | 800,000 us-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 |  | 4 ffic_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfInstrumentsOTTIChargeRecorded / invest_InvestmentIssuerAxis = ffic_PrivateIssuesMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_REMICAndCMOMember | 5 ffic_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) | 0 us-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) | 0 us-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) |  | 18,300,000 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CollateralizedMortgageObligationsMember |  |  |
Available-for-sale Securities, Gross Realized Losses (in Dollars) |  | 1,700,000 us-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 | 1 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_GNMAMember |  |  |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities (in Dollars) | 0 us-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 | 13 us-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 | 1 us-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 |  |  |  | 2 ffic_DiscountedCashFlowAnalysisSignificantAssumptionsIssuersThatPrepayNumber / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_PooledTrustPreferredSecuritiesMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |
Discounted Cash Flow Analysis, Significant Assumptions, Prepayment Amount (in Dollars) |  |  |  | 21,500,000 ffic_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 |  | 2 us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1 / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_PooledTrustPreferredSecuritiesMember |  |  |
Discounted Cash Flow Analysis, Significant Assumptions, Issuers that Prepay, Number |  |  |  |  | 2 ffic_DiscountedCashFlowAnalysisSignificantAssumptionsIssuersThatPrepayNumber / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = ffic_PooledTrustPreferredSecuritiesMember
Discounted Cash Flow Analysis, Significant Assumptions, Prepayment Amount (in Dollars) |  |  |  |  | 26,700,000 ffic_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 |  | 1 us-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 |  | 2 us-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) | 12,400,000 ffic_MortgageBackedSecuritiesAvailableForSaleAmortizedCost / ffic_CollateralTypeAxis = ffic_CollateralizedByCommercialRealEstateMember / us-gaap_DebtSecurityAxis = us-gaap_CollateralizedMortgageObligationsMember | 13,900,000 ffic_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 |  | 2 ffic_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) | 0 us-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) | $ 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities / invest_InvestmentIssuerAxis = ffic_FNMAMember |  |  |  |

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