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Note 18 - Fair Value of Financial Instruments - Fair Value Measured on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets | $ 745,742 | $ 867,731
Liabilities: |  |
Liabilities | 40,744 | 37,345
Fair Value, Inputs, Level 1 [Member] |  |
Assets | 11,575 |
Liabilities: |  |
Liabilities |  |
Fair Value, Inputs, Level 2 [Member] |  |
Assets | 733,057 | 860,370
Liabilities: |  |
Liabilities | 3,758 | 3,386
Fair Value, Inputs, Level 3 [Member] |  |
Assets | 1,110 | 7,361
Liabilities: |  |
Liabilities | 36,986 | 33,959
Collateralized Mortgage Backed Securities [Member] |  |
Assets | 509,650 | 516,476
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets |  |
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets | 509,650 | 516,476
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets |  |
Other Securities [Member] |  |
Assets | 228,704 | 344,905
Other Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets | 11,575 |
Other Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets | 216,019 | 337,544
Other Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets | 1,110 | 7,361
Interest Rate Swap [Member] |  |
Assets | 7,388 | 6,350
Liabilities: |  |
Liabilities | 3,758 | 3,386
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets |  |
Liabilities: |  |
Liabilities |  |
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets | 7,388 | 6,350
Liabilities: |  |
Liabilities | 3,758 | 3,386
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets |  |
Liabilities: |  |
Liabilities |  |
Junior Subordinated Debentures [Member] |  |
Liabilities: |  |
Liabilities | 36,986 | 33,959
Junior Subordinated Debentures [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Liabilities: |  |
Liabilities |  |
Junior Subordinated Debentures [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities: |  |
Liabilities |  |
Junior Subordinated Debentures [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities: |  |
Liabilities | $ 36,986 | $ 33,959

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity. + References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=ffic_OtherSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=ffic_JuniorSubordinatedDebenturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |