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Note 2 - Summary of Significant Accounting Policies (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]        
Cash and Cash Equivalents, at Carrying Value $ 34,265,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 33,485,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 40,425,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 55,721,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Interest-bearing Deposits in Banks and Other Financial Institutions 23,000,000us-gaap_InterestBearingDepositsInBanks 23,700,000us-gaap_InterestBearingDepositsInBanks    
Cash Reserve Deposit Required and Made 7,500,000us-gaap_CashReserveDepositRequiredAndMade 10,100,000us-gaap_CashReserveDepositRequiredAndMade    
Goodwill, Impairment Loss 0us-gaap_GoodwillImpairmentLoss      
Goodwill 16,127,000us-gaap_Goodwill 16,127,000us-gaap_Goodwill    
Number of Loan Portfolios 2ffic_NumberOfLoanPortfolios      
Fair Value, Collateral Dependent Loans, Percentage Of Appraised Or Internally Estimated Value Of Property 85.00%ffic_FairValueCollateralDependentLoansPercentageOfAppraisedOrInternallyEstimatedValueOfProperty      
Amount of Collateral Dependent Impaired Loans Measured For Impairment By Utilizing Third Party Appraisals 31,000,000ffic_AmountOfCollateralDependentImpairedLoansMeasuredForImpairmentByUtilizingThirdPartyAppraisals      
Percentage of Collateral Dependent Impaired Loans Measured For Impairment By Utilizing Third Party Appraisals 68.80%ffic_PercentageOfCollateralDependentImpairedLoansMeasuredForImpairmentByUtilizingThirdPartyAppraisals      
Amount of Collateral Dependent Impaired Loans Measured For Impairment Using Internal Evaluations 14,100,000ffic_AmountOfCollateralDependentImpairedLoansMeasuredForImpairmentUsingInternalEvaluations      
Percentage of Collateral Dependent Impaired Loans Measured For Impairment Using Internal Evaluations 31.20%ffic_PercentageOfCollateralDependentImpairedLoansMeasuredForImpairmentUsingInternalEvaluations      
Disposal Group, Including Discontinued Operation, Loans Receivable, Net 0us-gaap_LoansReceivableHeldForSaleNet 425,000us-gaap_LoansReceivableHeldForSaleNet    
Advertising Expense 1,800,000us-gaap_AdvertisingExpense 1,900,000us-gaap_AdvertisingExpense 1,700,000us-gaap_AdvertisingExpense  
Multi-Family Residential [Member] | Nonperforming Financing Receivable [Member]        
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]        
Disposal Group, Including Discontinued Operation, Loans Receivable, Net   $ 400,000us-gaap_LoansReceivableHeldForSaleNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ffic_MultiFamilyResidentialMember
/ us-gaap_ExternalCreditRatingByGroupingAxis
= us-gaap_NonperformingFinancingReceivableMember
   
Loans Held For Sale, Number   1ffic_LoansHeldForSaleNumber
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ffic_MultiFamilyResidentialMember
/ us-gaap_ExternalCreditRatingByGroupingAxis
= us-gaap_NonperformingFinancingReceivableMember
   
Antidilutive Options Excluded from Computation of Earnings Per Share [Member]        
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)   $ 18.55us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= ffic_AntidilutiveOptionsExcludedFromComputationOfEarningsPerShareMember
$ 17.63us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= ffic_AntidilutiveOptionsExcludedFromComputationOfEarningsPerShareMember
 
Bank Premises and Equipment [Member] | Minimum [Member]        
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]        
Property, Plant and Equipment, Useful Life 3 years      
Bank Premises and Equipment [Member] | Maximum [Member]        
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]        
Property, Plant and Equipment, Useful Life 40 years      
Employee Stock Option [Member]        
Note 2 - Summary of Significant Accounting Policies (Details) [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares) 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
151,900us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
550,400us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember