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

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of the outstanding recorded investment related to 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 40

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

+ Details

Name:	us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancialInstrumentPerformanceStatusAxis=us-gaap_PerformingFinancingReceivableMember
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_OneToFourFamilyResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

Note 5 - Loans (Details) - Troubled Debt Restructurings That Are Performing According to Their Restructured Terms $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014	Jun. 30, 2015 USD ($)	Jun. 30, 2014	Dec. 31, 2014 USD ($)
Financing Receivable, Modifications [Line Items]
Number of contracts	0	0	1	0
Performing Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts			25		25
Recorded investment	$ 9,926		$ 9,926		$ 10,391
Performing Financial Instruments [Member] \| Multi-Family Residential Portfolio Segment[Member]
Financing Receivable, Modifications [Line Items]
Number of contracts			9		10
Recorded investment	2,657		$ 2,657		$ 3,034
Performing Financial Instruments [Member] \| Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts			3		3
Recorded investment	2,356		$ 2,356		$ 2,373
Performing Financial Instruments [Member] \| One-To-Four Family - Mixed-Use Property Portfolio Segment[Member]
Financing Receivable, Modifications [Line Items]
Number of contracts			7		7
Recorded investment	2,358		$ 2,358		$ 2,381
Performing Financial Instruments [Member] \| One-To-Four Family - Residential Portfolio Segment[Member]
Financing Receivable, Modifications [Line Items]
Number of contracts			1		1
Recorded investment	349		$ 349		$ 354
Performing Financial Instruments [Member] \| Small Business Administration Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts			1
Recorded investment	39		$ 39
Performing Financial Instruments [Member] \| Commercial Business And Other Portfolio Segment[Member]
Financing Receivable, Modifications [Line Items]
Number of contracts			4		4
Recorded investment	$ 2,167		$ 2,167		$ 2,249