<SEC-DOCUMENT>0001127602-18-021866.txt : 20180625
<SEC-HEADER>0001127602-18-021866.hdr.sgml : 20180625
<ACCEPTANCE-DATETIME>20180625185931
ACCESSION NUMBER:		0001127602-18-021866
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20180622
FILED AS OF DATE:		20180625
DATE AS OF CHANGE:		20180625

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Hausmann John M
		CENTRAL INDEX KEY:			0001308181

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-51331
		FILM NUMBER:		18918013

	MAIL ADDRESS:	
		STREET 1:		15W060 NORTH FRONTAGE ROAD
		CITY:			BURR RIDGE
		STATE:			IL
		ZIP:			60527

ISSUER:		

	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

	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>4
<SEQUENCE>1
<FILENAME>form4.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2018-06-22</periodOfReport>

    <issuer>
        <issuerCik>0001303942</issuerCik>
        <issuerName>BankFinancial CORP</issuerName>
        <issuerTradingSymbol>BFIN</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001308181</rptOwnerCik>
            <rptOwnerName>Hausmann John M</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>15W060 NORTH FRONTAGE ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BURR RIDGE</rptOwnerCity>
            <rptOwnerState>IL</rptOwnerState>
            <rptOwnerZipCode>60527</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2018-06-22</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>20</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>18.32</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>69048.573</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes></footnotes>

    <ownerSignature>
        <signatureName>/s/ F. Morgan Gasior, pursuant to power of attorney</signatureName>
        <signatureDate>2018-06-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
