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Note 7 - Other Real Estate Owned - Gross Gains, Gross Losses and Write-downs of OREO (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Gross gains |  | $ 50

X
- Definition Represents gross gains on sales of other real estate. + References No definition available. + Details
Name: | ffic_GrossGainsOnSalesOfOtherRealEstate
Namespace Prefix: | ffic_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration