    <SEC-DOCUMENT>0001303942-19-000052-index.html : 20190514
    <SEC-HEADER>0001303942-19-000052.hdr.sgml : 20190514
    <ACCEPTANCE-DATETIME>20190514155452
    ACCESSION NUMBER:		0001303942-19-000052
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		6
    CONFORMED PERIOD OF REPORT:	20190514
    FILED AS OF DATE:		20190514
    DATE AS OF CHANGE:		20190514
    EFFECTIVENESS DATE:		20190514

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			BankFinancial CORP
    		CENTRAL INDEX KEY:			0001303942
    		STANDARD INDUSTRIAL CLASSIFICATION:	SAVINGS INSTITUTION, FEDERALLY CHARTERED [6035]
    		IRS NUMBER:				000000000
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-51331
    		FILM NUMBER:		19822575

    	BUSINESS ADDRESS:
    		STREET 1:		15W060 NORTH FRONTAGE ROAD
    		CITY:			BURR RIDGE
    		STATE:			IL
    		ZIP:			60527
    		BUSINESS PHONE:		(800) 894-6900

    	MAIL ADDRESS:
    		STREET 1:		15W060 NORTH FRONTAGE ROAD
    		CITY:			BURR RIDGE
    		STATE:			IL
    		ZIP:			60527
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEF 14A
    <SEQUENCE>1
    <FILENAME>bfindef14a20190430.htm
    <DESCRIPTION>DEF 14A
    <TEXT>
    Document 1 - file: bfindef14a20190430.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>a030d6dbankfinancialcommon05.jpg
    <TEXT>
    Document 2 - file: a030d6dbankfinancialcommon05.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>a030d6dbankfinancialcommon06.jpg
    <TEXT>
    Document 3 - file: a030d6dbankfinancialcommon06.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>bfingraphica01a05.jpg
    <TEXT>
    Document 4 - file: bfingraphica01a05.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>fmgsignaturea01a05.jpg
    <TEXT>
    Document 5 - file: fmgsignaturea01a05.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>jjbsignaturea01a05.jpg
    <TEXT>
    Document 6 - file: jjbsignaturea01a05.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>