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Note 11 - Fair Value of Financial Instruments - Quantitative Information About Non-recurring Level 3 Fair Value of Financial Instruments and the Fair Value Measurements (Details) $ in Thousands | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | ---
Impaired loans, Measurement Input | 0.15 | 0
Fair Value, Nonrecurring [Member] |  |
Impaired loans | $ 1,928 | $ 4,111
Valuation, Income Approach [Member] | Measurement Input, Cap Rate [Member] |  |
Impaired loans, Measurement Input |  | 8.5
Valuation, Income Approach [Member] | Measurement Input, Cap Rate [Member] | Minimum [Member] |  |
Impaired loans, Measurement Input | 0.2 |
Valuation, Income Approach [Member] | Measurement Input, Cap Rate [Member] | Maximum [Member] |  |
Impaired loans, Measurement Input | 0.545 |
Valuation, Income Approach [Member] | Measurement Input, Cap Rate [Member] | Weighted Average [Member] |  |
Impaired loans, Measurement Input | 0.396 | 8.5
Valuation, Income Approach [Member] | Measurement Input, Loss Severity [Member] |  |
Impaired loans, Measurement Input | 0.095 | 15
Valuation, Income Approach [Member] | Measurement Input, Loss Severity [Member] | Weighted Average [Member] |  |
Impaired loans, Measurement Input | 0.095 | 15
Valuation, Income Approach [Member] | Fair Value, Nonrecurring [Member] | Measurement Input, Cap Rate [Member] |  |
Impaired loans | $ 1,656 | $ 204
Valuation, Market Approach [Member] | Measurement Input, Comparability Adjustment [Member] | Minimum [Member] |  |
Impaired loans, Measurement Input | (0.1) |
Valuation, Market Approach [Member] | Measurement Input, Comparability Adjustment [Member] | Maximum [Member] |  |
Impaired loans, Measurement Input | 0.15 |
Valuation, Market Approach [Member] | Measurement Input, Comparability Adjustment [Member] | Weighted Average [Member] |  |
Impaired loans, Measurement Input | 0.025 | 0
Valuation, Market Approach [Member] | Measurement Input, Loss Severity [Member] | Minimum [Member] |  |
Impaired loans, Measurement Input |  | (36.5)
Valuation, Market Approach [Member] | Measurement Input, Loss Severity [Member] | Maximum [Member] |  |
Impaired loans, Measurement Input |  | 15
Valuation, Market Approach [Member] | Measurement Input, Loss Severity [Member] | Weighted Average [Member] |  |
Impaired loans, Measurement Input | 0.15 | 10.4
Valuation, Market Approach [Member] | Fair Value, Nonrecurring [Member] |  |
Impaired loans | $ 272 | $ 2,724
Blended Income and Sales Approach [Member] | Measurement Input, Cap Rate [Member] | Minimum [Member] |  |
Impaired loans, Measurement Input |  | 7.4
Blended Income and Sales Approach [Member] | Measurement Input, Cap Rate [Member] | Maximum [Member] |  |
Impaired loans, Measurement Input |  | 9.8
Blended Income and Sales Approach [Member] | Measurement Input, Cap Rate [Member] | Weighted Average [Member] |  |
Impaired loans, Measurement Input |  | 8.7
Blended Income and Sales Approach [Member] | Measurement Input, Comparability Adjustment [Member] | Minimum [Member] |  |
Impaired loans, Measurement Input |  | (30)
Blended Income and Sales Approach [Member] | Measurement Input, Comparability Adjustment [Member] | Maximum [Member] |  |
Impaired loans, Measurement Input |  | 10
Blended Income and Sales Approach [Member] | Measurement Input, Comparability Adjustment [Member] | Weighted Average [Member] |  |
Impaired loans, Measurement Input |  | (7.8)
Blended Income and Sales Approach [Member] | Measurement Input, Loss Severity [Member] |  |
Impaired loans, Measurement Input |  | 15
Blended Income and Sales Approach [Member] | Measurement Input, Loss Severity [Member] | Weighted Average [Member] |  |
Impaired loans, Measurement Input |  | 15
Blended Income and Sales Approach [Member] | Fair Value, Nonrecurring [Member] |  |
Impaired loans |  | $ 1,183
Sales Approach Valuation Technique [Member] |  |
Other repossessed assets |  | $ 35
Other repossessed assets, Measurement Input |  | 0
Sales Approach Valuation Technique [Member] | Measurement Input, Loss Severity [Member] | Weighted Average [Member] |  |
Other repossessed assets, Measurement Input |  | 0

X
- Definition Represents the fair value portion of impaired loans. + References No definition available. + Details
Name: | ffic_ImpairedLoansFairValue
Namespace Prefix: | ffic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Value of input used to measure impaired loans. + References No definition available. + Details
Name: | ffic_ImpairedLoansMeasurementInput
Namespace Prefix: | ffic_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of other repossessed assets. + References No definition available. + Details
Name: | ffic_OtherRepossessedAssets
Namespace Prefix: | ffic_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Value of input used to measure other repossessed assets. + References No definition available. + Details
Name: | ffic_OtherRepossessedAssetsMeasurementInput
Namespace Prefix: | ffic_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_IncomeApproachValuationTechniqueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputCapRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputLossSeverityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_MarketApproachValuationTechniqueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputComparabilityAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=ffic_BlendedIncomeAndSalesApproachMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=ffic_SalesApproachValuationTechniqueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |