Note 9 - Borrowed Funds and Securities Sold Under Agreements to Repurchase (Details) - Terms of the Securities Issued by the Trusts (Capital Securities [Member])	12 Months Ended
Dec. 31, 2013
Flushing Financial Capital Trust II [Member]
Note 9 - Borrowed Funds and Securities Sold Under Agreements to Repurchase (Details) - Terms of the Securities Issued by the Trusts [Line Items]
Initial Rate	7.14%
First Reset Date	Sep. 01, 2012
Spread over 3-month LIBOR	1.41%
Maturity Date	Sep. 01, 2037
Flushing Financial Capital Trust III [Member]
Note 9 - Borrowed Funds and Securities Sold Under Agreements to Repurchase (Details) - Terms of the Securities Issued by the Trusts [Line Items]
Initial Rate	6.89%
First Reset Date	Jun. 15, 2012
Spread over 3-month LIBOR	1.44%
Maturity Date	Sep. 15, 2037
Flushing Financial Capital Trust IV [Member]
Note 9 - Borrowed Funds and Securities Sold Under Agreements to Repurchase (Details) - Terms of the Securities Issued by the Trusts [Line Items]
Initial Rate	6.85%
First Reset Date	Jul. 30, 2012
Spread over 3-month LIBOR	1.42%
Maturity Date	Jul. 30, 2037

First reset date for the interest rate on the debt instrument.

No definition available.

Name:	ffic_DebtInstrumentFirstResetDate
Namespace Prefix:	ffic_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:	ffic_
Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration