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Note 3 - Loans (Details) - Troubled Debt Restructurings That Are Not Performing According to Their Restructured Terms (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Modifications [Line Items]    
Number of contracts 2ffic_FinancingReceivableModificationsNotPerformingAccordingToRestructuredTermsNumberOfContracts1 1ffic_FinancingReceivableModificationsNotPerformingAccordingToRestructuredTermsNumberOfContracts1
Recorded investment $ 2,439ffic_FinancingReceivableModificationsNotPerformingAccordingToRestructuredTermsRecordedInvestment $ 2,332ffic_FinancingReceivableModificationsNotPerformingAccordingToRestructuredTermsRecordedInvestment
Commercial Real Estate Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts 1ffic_FinancingReceivableModificationsNotPerformingAccordingToRestructuredTermsNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ffic_CommercialRealEstateLoansMember		 1ffic_FinancingReceivableModificationsNotPerformingAccordingToRestructuredTermsNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ffic_CommercialRealEstateLoansMember
Recorded investment 2,252ffic_FinancingReceivableModificationsNotPerformingAccordingToRestructuredTermsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ffic_CommercialRealEstateLoansMember		 2,332ffic_FinancingReceivableModificationsNotPerformingAccordingToRestructuredTermsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ffic_CommercialRealEstateLoansMember
One-To-Four Family - Mixed-Use Property [Member]    
Financing Receivable, Modifications [Line Items]    
Number of contracts 1ffic_FinancingReceivableModificationsNotPerformingAccordingToRestructuredTermsNumberOfContracts1
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ffic_OneToFourFamilyMixedUsePropertyMember		  
Recorded investment $ 187ffic_FinancingReceivableModificationsNotPerformingAccordingToRestructuredTermsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ffic_OneToFourFamilyMixedUsePropertyMember