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Loans - Foregone on Non-accrual Loans and Loans Classified as TDR (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Loans |  |  |  |
Interest income that would have been recognized had the loans performed in accordance with their original terms | $ 900 | $ 425 | $ 2,246 | $ 1,405
Less: Interest income included in the results of operations | (5) | (2) | (10) | (20)
Total foregone interest | $ 895 | $ 423 | $ 2,236 | $ 1,385

X
- Definition The gross interest income that would have been recorded in the period on troubled debt restructurings and nonaccrual loans, if the loans had been current in accordance with their original terms and had been outstanding throughout the period or since origination, if held for part of the period. + References No definition available. + Details
Name: | ffic_LoansAndLeasesReceivableImpairedTroubledDebtAndNonAccrualLoansInterestIncome
Namespace Prefix: | ffic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Interest income, relating to troubled debt and non-accrual loans, that would have been recognized had the loans performed in accordance with their original terms less the amount of interest income recognized in the results of operations. This amount represents the total foregone interest. + References No definition available. + Details
Name: | ffic_LoansAndLeasesReceivableTroubledDebtAndNonAccrualLoansInterestForegone
Namespace Prefix: | ffic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Interest income from troubled debt and non-accrual loans which was recognized in the results of operations. + References No definition available. + Details
Name: | ffic_LoansAndLeasesReceivableTroubledDebtAndNonAccrualLoansInterestIncomeRecognized
Namespace Prefix: | ffic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration