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Loans and Allowance for Credit Losses - Foregone on Non-accrual Loans and Loans Classified as TDR (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Loans and Allowance for Credit Losses |  |  |
Interest income that would have been recognized had the loans performed in accordance with their original terms | $ 2,885 | $ 1,995 | $ 2,309
Less: Interest income included in the results of operations | (11) | (25) | (746)
Total foregone interest | $ 2,874 | $ 1,970 | $ 1,563

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- 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
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Balance Type: | credit
Period Type: | duration

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

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- References No definition available. + Details
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