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Note 18 - Fair Value of Financial Instruments - Assets and Liabilities Carried at Fair Value on a Non-recurring Basis, and the Method Used to Determine Their Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value	$ 16,027	$ 15,501
Impaired Loans [Member]
Fair Value	16,027	14,968
Other Real Estate Owned [Member]
Fair Value		533
Fair Value, Inputs, Level 1 [Member]
Fair Value
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member]
Fair Value
Fair Value, Inputs, Level 1 [Member] | Other Real Estate Owned [Member]
Fair Value
Fair Value, Inputs, Level 2 [Member]
Fair Value
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member]
Fair Value
Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member]
Fair Value
Fair Value, Inputs, Level 3 [Member]
Fair Value	16,027	15,501
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Fair Value	16,027	14,968
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Fair Value		$ 533

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring 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_AssetsFairValueDisclosureNonrecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=ffic_ImpairedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=ffic_OtherRealEstateOwnedMember
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Balance Type:
Period Type:

X

- Details

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

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
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Period Type:

X

- Details

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