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Note 11 - Fair Value of Financial Instruments (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Fair Value, Measurements, Nonrecurring [Member]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 0		$ 0		$ 0
Interest Rate Swap [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	500,000	$ 2,100,000	4,300,000	$ 1,300,000
Financial Liabilites at Fair Value Option Contractual Principal	61,900,000		61,900,000		61,900,000
Financial Liabilities at Fair Value Option Accrued Interest Payable	100,000		100,000		100,000
Financial Assets at Fair Value Option	30,700,000		30,700,000		30,700,000
Financial Liabilities at Fair Value Option	27,800,000		27,800,000		$ 29,000,000
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ (823,000)	$ (1,094,000)	$ (2,925,000)	$ (921,000)
Fair Value Inputs, Discount Rate			85.00%

X

- Definition

The fair value option of financial assets.

+ References

No definition available.

+ Details

Name:	ffic_FinancialAssetsAtFairValueOption
Namespace Prefix:	ffic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The fair value of the option contractual principal.

+ References

No definition available.

+ Details

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Namespace Prefix:	ffic_
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Balance Type:	credit
Period Type:	instant

X

- Definition

The fair value option of financial liabilities.

+ References

No definition available.

+ Details

Name:	ffic_FinancialLiabilitiesAtFairValueOption
Namespace Prefix:	ffic_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The fair value of the accrued interest payable on the option.

+ References

No definition available.

+ Details

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Namespace Prefix:	ffic_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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X

- Definition

For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Details

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