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Note 5 - Loans (Details) - Troubled Debt Restructurings That are Not Performing According to Their Restructured Terms: (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | 2 | 1
Recorded investment | $ 2,373 | $ 2,332
Commercial Real Estate Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | 1 | 1
Recorded investment | 2,186 | 2,332
One-To-Four Family - Mixed-Use Property [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of contracts | 1 |
Recorded investment | $ 187 |

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings and are not performing to their restructured terms. + References No definition available. + Details
Name: | ffic_FinancingReceivableModificationsNotPerformingAccordingToRestructuredTermsNumberOfContracts1
Namespace Prefix: | ffic_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings and are not performing according to their restructured terms. + References No definition available. + Details
Name: | ffic_FinancingReceivableModificationsNotPerformingAccordingToRestructuredTermsRecordedInvestment
Namespace Prefix: | ffic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration