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Note 15 - Commitments and Contingencies (Details) - USD ($) $ in Millions	1 Months Ended	2 Months Ended	12 Months Ended
	Jun. 30, 2007	Jul. 31, 2007	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Note 15 - Commitments and Contingencies (Details) [Line Items]
Loans and Leases Receivable, Commitments, Fixed Rates			$ 50.1
Loans and Leases Receivable, Commitments, Weighted Average Fixed Rate of Interest			4.18%
Loans and Leases Receivable, Commitments, Variable Rates			$ 278.7
Loans and Leases Receivable, Commitments, Variable Rates, Weighted Average Rate			3.46%
Loan Commitments Expiration			90 days
Line of Credit, Maturity, Max			18 months
Operating Leases, Rent Expense			$ 5.8	$ 3.8	$ 3.7
Home Equity Line of Credit [Member]
Note 15 - Commitments and Contingencies (Details) [Line Items]
Loans and Leases Receivable, Commitments, Credit			$ 232.5
Line of Credit, Maturity, Max			10 years
Letter of Credit Pledged as Collateral [Member]
Note 15 - Commitments and Contingencies (Details) [Line Items]
Deposit Liabilities, Collateral Issued, Financial Instruments			$ 494.0
Mortgages [Member]
Note 15 - Commitments and Contingencies (Details) [Line Items]
Loans and Leases Receivable, Commitments, Credit			$ 96.2
Capital Securities [Member] | Flushing Financial's Capital Trusts [Member]
Note 15 - Commitments and Contingencies (Details) [Line Items]
Proceeds from Issuance of Debt	$ 20.6	$ 61.9

X

- Definition

Maximum length of time until the line of credit matures.

+ References

No definition available.

+ Details

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Namespace Prefix:	ffic_
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Balance Type:	na
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X

- Definition

Loan commitments expiration period.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Reflects the amount of cash required to fully fund agreements to provide credit to borrowers.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Reflects the weighted average interest rate on commitments to advance to borrowers and lessees at interest rates that increase or decrease depending on certain facts or circumstances.

+ References

No definition available.

+ Details

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X

- Definition

Reflects the weighted average interest rate associated with agreements to provide advances to borrowers and lessees at stated interest rates.

+ References

No definition available.

+ Details

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- References

No definition available.

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X

- Definition

Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818

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X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at stated interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 825
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=51676700&loc=d3e61044-112788

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 825
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=51676700&loc=d3e61082-112788

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X

- Definition

Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at interest rates that increase or decrease depending on certain facts or circumstances.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 825
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=51676700&loc=d3e61082-112788

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 825
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=51676700&loc=d3e61044-112788

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X

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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