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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, 2020 USD ($) | Mar. 31, 2019 USD ($)
Loans sold | 2 | 3
Proceeds | $ 580 | $ 1,170
Net (charge-offs) recoveries | 0 | (1)
Net gain (loss) | $ 42 | $ 63
Multi-family Residential Portfolio Segment [Member] |  |
Loans sold | 1 | 2
Proceeds | $ 284 | $ 765
Net (charge-offs) recoveries | 0 | 0
Net gain (loss) | $ 42 | $ 63
One-To-Four Family - Mixed-Use Property Portfolio Segment [Member] |  |
Loans sold | 1 | 1
Proceeds | $ 296 | $ 405
Net (charge-offs) recoveries | 0 | (1)
Net gain (loss) | $ 0 | $ 0

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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
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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
Namespace Prefix: | ffic_
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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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Data Type: | na
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Period Type: |