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Note 11 - Derivative Financial Instruments (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Note 11 - Derivative Financial Instruments (Details) [Line Items]      
Junior Subordinated Notes $ 61,900,000us-gaap_JuniorSubordinatedNotes   $ 61,900,000us-gaap_JuniorSubordinatedNotes
Derivative Asset, Notional Amount 50,704,000us-gaap_DerivativeAssetNotionalAmount 50,792,000us-gaap_DerivativeAssetNotionalAmount  
Not Designated as Hedging Instrument [Member]      
Note 11 - Derivative Financial Instruments (Details) [Line Items]      
Derivative Asset, Notional Amount 36,300,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
  36,300,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Designated as Hedging Instrument [Member]      
Note 11 - Derivative Financial Instruments (Details) [Line Items]      
Derivative Asset, Notional Amount 14,400,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
14,500,000us-gaap_DerivativeAssetNotionalAmount
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
 
Floating Rate Junior Subordinated Debentures [Member]      
Note 11 - Derivative Financial Instruments (Details) [Line Items]      
Derivative, Amount of Hedged Item $ 18,000,000us-gaap_DerivativeAmountOfHedgedItem
/ us-gaap_DebtInstrumentAxis
= ffic_FloatingRateJuniorSubordinatedDebenturesMember
  $ 18,000,000us-gaap_DerivativeAmountOfHedgedItem
/ us-gaap_DebtInstrumentAxis
= ffic_FloatingRateJuniorSubordinatedDebenturesMember