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Regulatory Capital (Details)	Mar. 31, 2025	Dec. 31, 2024
Savings Bank [Member]
Capital Conservation Buffer	5.36%	5.11%
Holding Company
Capital Conservation Buffer	4.88%	4.82%

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:	dtr-types: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: