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Concentration of Credit Risk (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Note to Financial Statements
Lending Limit to Single Borrower	$ 127.1	$ 123.8
Largest Aggregate Amount of Outstanding Loans to Single Borrower	$ 93.0	$ 103.2

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- Definition

Largest aggregate amount of loans to a single borrower.

+ References

No definition available.

+ Details

Name:	ffic_LargestAggregateAmountOfLoansToSingleBorrower
Namespace Prefix:	ffic_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Represents lending limit to a single borrower.

+ References

No definition available.

+ Details

Name:	ffic_LendingLimitToSingleBorrower
Namespace Prefix:	ffic_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	ffic_NoteToFinancialStatementDetailsTextual
Namespace Prefix:	ffic_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration