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Regulatory Capital (Details)	Mar. 31, 2021	Dec. 31, 2020
Savings Bank [Member]
Capital Conservation Buffer	4.68%	4.30%
Holding Company
Capital Conservation Buffer	4.84%	4.54%

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

- 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: