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Note 14 - Regulatory Capital (Details Textual) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2016
Capital Conservation Buffer Required for Capital Adequacy | 1.25% |  |
Capital Conservation Buffer Required for Capital Adequacy Annual Increase | 0.625% |  |
Savings Bank [Member] |  |  |
Capital Conservation Buffer | 6.31% |  | 6.64%
Holding Company [Member] |  |  |
Capital Conservation Buffer | 6.38% |  | 6.56%
Scenario, Forecast [Member] |  |  |
Capital Conservation Buffer Required for Capital Adequacy |  | 2.50% |

X
- 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: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The minimum capital conservation buffer, above the regulatory minimum capital ratios, required for capital adequacy annual increase. + References No definition available. + Details
Name: | ffic_CapitalConservationBufferRequiredForCapitalAdequacyAnnualIncrease
Namespace Prefix: | ffic_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |