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Note 12 - Pension and Other Postretirement Benefit Plans (Details) - Employee Benefit Trust (EBT) Shares (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Employee Benefit Trust (EBT) Shares [Abstract] |  |
Shares owned by Employee Benefit Trust, balance | 913,792 us-gaap_CommonStockSharesHeldInEmployeeTrustShares | 1,028,565 us-gaap_CommonStockSharesHeldInEmployeeTrustShares
Market value of unallocated shares. (in Dollars) | $ 16,235,257 us-gaap_CommonStockIssuedEmployeeTrustDeferred | $ 18,915,494 us-gaap_CommonStockIssuedEmployeeTrustDeferred
Shares purchased | 23,717 ffic_CommonStockSharesPurchasedByEmployeeTrust | 29,168 ffic_CommonStockSharesPurchasedByEmployeeTrust
Shares released and allocated | (136,559)ffic_CommonStockSharesReleasedAndAllocatedByTheEmployeeTrust | (143,941)ffic_CommonStockSharesReleasedAndAllocatedByTheEmployeeTrust
Shares owned by Employee Benefit Trust, balance | 800,950 us-gaap_CommonStockSharesHeldInEmployeeTrustShares | 913,792 us-gaap_CommonStockSharesHeldInEmployeeTrustShares

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- Definition Number of shares purchased during the period by the Employee Trust. + References No definition available. + Details
Name: | ffic_CommonStockSharesPurchasedByEmployeeTrust
Namespace Prefix: | ffic_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Common stock released and allocated by the Employee Trust. + References No definition available. + Details
Name: | ffic_CommonStockSharesReleasedAndAllocatedByTheEmployeeTrust
Namespace Prefix: | ffic_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ffic_EmployeeBenefitTrustEbtSharesAbstract
Namespace Prefix: | ffic_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregate value of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6409836&loc=d3e19850-108362 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6409836&loc=d3e19833-108362 + Details
Name: | us-gaap_CommonStockIssuedEmployeeTrustDeferred
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6418455&loc=d3e16701-113920 + Details
Name: | us-gaap_CommonStockSharesHeldInEmployeeTrustShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant