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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