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Loans held for sale - Delinquent and Non-performing Loans Sold During the Period Indicated (Details) - Nonperforming Financial Instruments [Member] $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 USD ($) loan | Jun. 30, 2023 USD ($) loan | Jun. 30, 2024 USD ($) loan | Jun. 30, 2023 USD ($) loan
Loans sold | loan | 2 | 5 | 11 | 13
Proceeds | $ 690 | $ 4,466 | $ 4,500 | $ 7,042
Net Charge-offs |  |  |  | (8)
Net gain | $ 26 | $ 54 | $ 136 | $ 108
Multi-family Residential Portfolio Segment [Member] |  |  |  |
Loans sold | loan | 1 | 2 | 4 | 7
Proceeds | $ 432 | $ 2,074 | $ 1,984 | $ 3,622
Net gain |  | $ 14 | $ 55 | $ 69
Commercial Real Estate [Member] |  |  |  |
Loans sold | loan |  | 1 | 2 | 3
Proceeds |  | $ 1,026 | $ 970 | $ 1,867
Net Charge-offs |  |  |  | $ (8)
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] |  |  |  |
Loans sold | loan | 1 | 2 | 5 | 3
Proceeds | $ 258 | $ 1,366 | $ 1,546 | $ 1,553
Net gain | $ 26 | $ 40 | $ 81 | $ 39

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- Definition Amount of net recoveries (charge-offs) during the period on delinquent and non-performing loans during the period. + 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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- Definition Proceeds from the sales of delinquent and non-performing loans sold during the period. + References No definition available. + Details
Name: | ffic_DelinquentAndNonPerformingLoansProceeds
Namespace Prefix: | ffic_
Data Type: | xbrli:monetaryItemType
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- Definition Delinquent and non-performing loans sold during the period. + References No definition available. + Details
Name: | ffic_DelinquentAndNonPerformingLoansSold
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Data Type: | xbrli:integerItemType
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Period Type: | duration

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- Definition Net gain (loss) on delinquent and non-performing loans during the period. + References No definition available. + Details
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Namespace Prefix: | ffic_
Data Type: | xbrli:monetaryItemType
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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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Data Type: | na
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Period Type: |

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- Details
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Period Type: |