Note 7 - Other Real Estate Owned - Gross Gains, Gross Losses and Write-downs of OREO (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Gross gains	$ 27		$ 27	$ 50

Represents gross gains on sales of other real estate.

No definition available.

Name:	ffic_GrossGainsOnSalesOfOtherRealEstate
Namespace Prefix:	ffic_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration