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Note 18 - Fair Value of Financial Instruments (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Financial Assets at Fair Value Option	$ 13,800	$ 14,300
Financial Liabilities at Fair Value Option	41,800	37,000
Proceeds from Sale of Long-term Investments	200	3,000
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(4,122)	(3,465)	$ (3,434)
Financial Liabilites at Fair Value Option Contractual Principal	61,900	61,900
Financial Liabilities at Fair Value Option Accrued Interest Payable	$ 200	200
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount		11,600
Appraised Value of Property [Member]
Collateral Dependent Loans Measurement Input	0.85
Fair Value, Measurements, Nonrecurring [Member]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 0	0
Interest Rate Swaps [Member]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ 900	$ (600)	$ 1,500

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

Name:	ffic_FinancialLiabilitesAtFairValueOptionContractualPrincipal
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

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Namespace Prefix:	ffic_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

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

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

+ 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 (bb)
-URI http://asc.fasb.org/extlink&oid=99377789&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://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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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=99377789&loc=d3e19207-110258

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X

- Definition

The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, beyond the current operating cycle.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

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X

- Details

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