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Note 11 - Fair Value of Financial Instruments (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Financial Assets at Fair Value Option	$ 14,300		$ 14,300		$ 13,800
Financial Liabilities at Fair Value Option	43,900		43,900		41,800
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(2,124)	$ (170)	(6,160)	$ (537)
Financial Liabilites at Fair Value Option Contractual Principal	61,900		61,900
Financial Liabilities at Fair Value Option Accrued Interest Payable	$ 200		$ 200
Appraised Value of Property [Member]
Collateral Dependent Loans Measurement Input	0.85		0.85
Fair Value, Nonrecurring [Member]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 0		$ 0		$ 0
Interest Rate Swaps [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ (1,600)	$ 500	$ (4,300)	$ 2,900

X

- Definition

Represents the collateral dependent loans measurement input.

+ References

No definition available.

+ Details

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Namespace Prefix:	ffic_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

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_
Data Type:	xbrli:monetaryItemType
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
Balance Type:	credit
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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612

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Namespace Prefix:	us-gaap_
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X

- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Details

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- Details

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Namespace Prefix:
Data Type:	na
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X

- Details

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