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Regulatory Capital (Details) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Capital Conservation Buffer Required for Capital Adequacy | 2.50% |
Savings Bank [Member] |  |
Capital Conservation Buffer | 6.13% | 4.30%
Holding Company |  |
Capital Conservation Buffer | 5.75% | 4.54%

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- Definition Represents the capital conservation buffer, above the regulatory minimum capital ratios. + References No definition available. + Details
Name: | ffic_CapitalConservationBuffer
Namespace Prefix: | ffic_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The minimum capital conservation buffer, above the regulatory minimum capital ratios, required for capital adequacy. + References No definition available. + Details
Name: | ffic_CapitalConservationBufferRequiredForCapitalAdequacy
Namespace Prefix: | ffic_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | dei_LegalEntityAxis=ffic_SavingsBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=ffic_HoldingCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |