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Document and Entity Information
Dec. 17, 2020
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Dec. 17, 2020
Entity Registrant Name BankFinancial CORP
Entity Incorporation, State or Country Code MD
Entity File Number 000-51331
Entity Tax Identification Number 75-3199276
Entity Address, Address Line One 15W060 NORTH FRONTAGE ROAD
Entity Address, City or Town BURR RIDGE
Entity Address, State or Province IL
Entity Address, Postal Zip Code 60527
City Area Code 800
Local Phone Number 894-6900
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0001303942
Title of 12(b) Security Common
Trading Symbol BFIN
Security Exchange Name NASDAQ