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Document and Entity Information
Jan. 31, 2020
Cover [Abstract]  
Entity Registrant Name FLUSHING FINANCIAL CORP
Entity Address, State or Province NY
Amendment Flag false
Entity Central Index Key 0000923139
Document Type 8-K
Document Period End Date Jan. 31, 2020
Entity Incorporation State Country Code DE
Entity File Number 001-33013
Entity Tax Identification Number 11-3209278
Entity Address, Address Line One 220 RXR Plaza
Entity Address, City or Town Uniondale
Entity Address, Postal Zip Code 11556
City Area Code (718)
Local Phone Number 961-5400
Written Communications true
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $0.01 par value
Trading Symbol FFIC
Security Exchange Name NASDAQ
Entity Emerging Growth Company false