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

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- Definition Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument. + References No definition available. + Details
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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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