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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
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Mar. 31, 2023 USD ($) loan
Loans sold | loan | 8
Proceeds | $ 2,575
Net gain | $ 54
Multi-family Residential Portfolio Segment [Member] |
Loans sold | loan | 5
Proceeds | $ 1,548
Net gain | $ 54
Commercial Real Estate [Member] |
Loans sold | loan | 2
Proceeds | $ 840
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] |
Loans sold | loan | 1
Proceeds | $ 187

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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
Balance Type: | debit
Period Type: | duration

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- Definition Delinquent and non-performing loans sold during the period. + References No definition available. + Details
Name: | ffic_DelinquentAndNonPerformingLoansSold
Namespace Prefix: | ffic_
Data Type: | xbrli:integerItemType
Balance Type: | na
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
Balance Type: | credit
Period Type: | duration

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

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

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- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=ffic_OneToFourFamilyMixedUsePropertyPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |