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Parent Company Only Financial Information - Condensed Statements of Financial Condition, Parenthetical (Details) - shares	Dec. 31, 2024	Dec. 31, 2023
Treasury stock, at average cost (in shares)	5,018,720	5,221,813
Holding Company
Treasury stock, at average cost (in shares)	5,018,720	5,221,813

X

- Definition

Number of previously issued common shares repurchased by the issuing entity and held in treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481549/505-30-45-1

+ Details

Name:	us-gaap_TreasuryStockCommonShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

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