Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

+ Details

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

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=ffic_SmallBusinessAdministrationPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_InterestRateBelowMarketReductionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=ffic_MultifamilyResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=ffic_OneToFourFamilyMixedUsePropertyPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=ffic_CommercialBusinessAndOtherPortfolioSegmentMember
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Note 3 - Loans and Allowance for Loan Losses (Details) - Loans Modified and Classified as TDR $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014	Dec. 31, 2013 USD ($)
Financing Receivable, Modifications [Line Items]
Number	1	0	6
Balance	$ 41		$ 2,048
Small Business Administration Portfolio Segment [Member] \| Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Number	1
Balance	$ 41
Multi-family Residential Portfolio Segment [Member] \| Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Number			2
Balance			$ 698
Commercial Real Estate Portfolio Segment [Member] \| Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Number			1
Balance			$ 273
One-to-Four Family - Mixed-Use Property Portfolio Segment [Member] \| Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Number			1
Balance			$ 390
Commercial Business and Other Portfolio Segment [Member] \| Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Number			2
Balance			$ 687