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Note 12 - Pension and Other Postretirement Benefit Plans (Details) - Employee Benefit Trust (EBT) Shares - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Employee Benefit Trust (EBT) Shares [Abstract]
Shares owned by Employee Benefit Trust, balance	800,950	913,792
Market value of unallocated shares. (in Dollars)	$ 14,616,435	$ 16,235,257
Shares purchased	22,102	23,717
Shares released and allocated	(147,616)	(136,559)
Shares owned by Employee Benefit Trust, balance	675,436	800,950

X

- Definition

Number of shares purchased during the period by the Employee Trust.

+ References

No definition available.

+ Details

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Namespace Prefix:	ffic_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- References

No definition available.

+ Details

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

X

- 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

X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant