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Note 15 - Subsequent Events (Details) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified | 0 Months Ended |
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May 06, 2015 | May 06, 2015
Subsequent Event [Member] |  |
Note 15 - Subsequent Events (Details) [Line Items] |  |
Number of Buildings Sold in a Sales Leaseback Transaction | 3 ffic_NumberOfBuildingsSoldInASalesLeasebackTransaction. / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 3 ffic_NumberOfBuildingsSoldInASalesLeasebackTransaction. / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Sale Leaseback Transaction, Net Proceeds, Financing Activities | $ 20.3 us-gaap_SaleLeasebackTransactionNetProceedsFinancingActivities / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Sale Leaseback Transaction, Gain on Sale | 12.7 ffic_SaleLeasebackTransactionGainOnSale / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | 12.7 ffic_SaleLeasebackTransactionGainOnSale / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Sale Leaseback Transaction, Deferred Gain, Gross | $ 6.1 us-gaap_SaleLeasebackTransactionDeferredGainGross / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember | $ 6.1 us-gaap_SaleLeasebackTransactionDeferredGainGross / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- Details
Name: | ffic_Note15SubsequentEventsDetailsLineItems
Namespace Prefix: | ffic_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of buildings sold in a sales leaseback transaction. + References No definition available. + Details
Name: | ffic_NumberOfBuildingsSoldInASalesLeasebackTransaction.
Namespace Prefix: | ffic_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The amount of the total gain recorded in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller. + References No definition available. + Details
Name: | ffic_SaleLeasebackTransactionGainOnSale
Namespace Prefix: | ffic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of the gain recorded in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller to be recognized in future periods. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6456126&loc=d3e49567-112750 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of cash inflow after closing and deferred financing costs received by a seller-lessee in a sale-leaseback recognized in financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51840-112757 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51831-112757 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51843-112757 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration