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Regulatory Capital (Details)	Sep. 30, 2020
Capital Conservation Buffer Required for Capital Adequacy	2.50%
Savings Bank [Member]
Capital Conservation Buffer	5.54%
Holding Company
Capital Conservation Buffer	5.71%

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

- 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: