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Note 5 - Loans (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Note 5 - Loans (Details) [Line Items]      
Fair Value of Collateral Dependent Loans, As a Percentage of Appraised Or Estimated Value of Collateral 85.00%ffic_FairValueOfCollateralDependentLoansAsAPercentageOfAppraisedOrEstimatedValueOfCollateral    
Collateral Dependent Impaired Loans, Measured By Third Party Appraisals $ 31.0ffic_CollateralDependentImpairedLoansMeasuredByThirdPartyAppraisals    
Collateral Dependent Impaired Loans, Measured By Third Party Appraisals, Percentage 66.40%ffic_CollateralDependentImpairedLoansMeasuredByThirdPartyAppraisalsPercentage    
Collateral Dependent Impaired Loans, Measured Internally 15.7ffic_CollateralDependentImpairedLoansMeasuredInternally    
Collateral Dependent Impaired Loans, Measured Internally, Percentage 33.60%ffic_CollateralDependentImpairedLoansMeasuredInternallyPercentage    
Financing Receivable, Modifications, Number of Contracts 1us-gaap_FinancingReceivableModificationsNumberOfContracts2 0us-gaap_FinancingReceivableModificationsNumberOfContracts2  
Financing Receivable, Modifications During Period, Recorded Investment 0.4ffic_FinancingReceivableModificationsDuringPeriodRecordedInvestment    
Commitments and Contingencies        
Extension of Credit [Member]      
Note 5 - Loans (Details) [Line Items]      
Commitments and Contingencies 62.7us-gaap_CommitmentsAndContingencies
/ us-gaap_SupplyCommitmentAxis
= ffic_ExtensionOfCreditMember
   
Extension of Lines of Credit [Member]      
Note 5 - Loans (Details) [Line Items]      
Commitments and Contingencies $ 174.5us-gaap_CommitmentsAndContingencies
/ us-gaap_SupplyCommitmentAxis
= ffic_ExtensionOfLinesOfCreditMember