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Note 14 - Regulatory Capital (Details Textual)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2016
Capital Conservation Buffer Required for Capital Adequacy	1.25%
Capital Conservation Buffer Required for Capital Adequacy Annual Increase	0.625%
Savings Bank [Member]
Capital Conservation Buffer	6.31%		6.64%
Holding Company [Member]
Capital Conservation Buffer	6.38%		6.56%
Scenario, Forecast [Member]
Capital Conservation Buffer Required for Capital Adequacy		2.50%

X

- Definition

Represents the capital conservation buffer, above the regulatory minimum capital ratios.

+ References

No definition available.

+ Details

Name:	ffic_CapitalConservationBuffer
Namespace Prefix:	ffic_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The minimum capital conservation buffer, above the regulatory minimum capital ratios, required for capital adequacy.

+ References

No definition available.

+ Details

Name:	ffic_CapitalConservationBufferRequiredForCapitalAdequacy
Namespace Prefix:	ffic_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The minimum capital conservation buffer, above the regulatory minimum capital ratios, required for capital adequacy annual increase.

+ References

No definition available.

+ Details

Name:	ffic_CapitalConservationBufferRequiredForCapitalAdequacyAnnualIncrease
Namespace Prefix:	ffic_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=ffic_SavingsBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=ffic_HoldingCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: