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Note 6 - Securities (Details Textual)	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Securities, Trading, and Equity Securities, FV-NI, Total	$ 0	$ 0
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Total	0	0
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities	0	0	$ 0
Proceeds from Sale of Available-for-sale Securities, Total	120,300,000	112,400,000	$ 126,000,000
Non-qualified Deferred Compensation Plan [Member] | Other Assets [Member]
Deferred Compensation Plan, Amounts Held in Rabbi Trust	$ 17,300,000	$ 17,000,000
Collateralized Mortgage Obligations by Commercial Real Estate [Member]
Private Issue Collateralized Mortgage Obligations, Number	0	1
Mortgage Backed Securities Available for Sale Amortized Cost		$ 21,000

X

- Definition

The amount held in a rabbi trust for certain non-qualified deferred compensation plans.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of amortized cost on available for sale mortgage backed securities.

+ References

No definition available.

+ Details

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Namespace Prefix:	ffic_
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X

- Definition

The number of privately issued collateralized mortgage obligations.

+ References

No definition available.

+ Details

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X

- Definition

The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

No definition available.

+ Details

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X

- Definition

The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

+ References

No definition available.

+ Details

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X

- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

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X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.4)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- Details

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X

- Details

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