<SEC-DOCUMENT>0001127602-22-010867.txt : 20220401
<SEC-HEADER>0001127602-22-010867.hdr.sgml : 20220401
<ACCEPTANCE-DATETIME>20220401165305
ACCESSION NUMBER:		0001127602-22-010867
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20220331
FILED AS OF DATE:		20220401
DATE AS OF CHANGE:		20220401

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Costa James M
		CENTRAL INDEX KEY:			0001583207

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-26584
		FILM NUMBER:		22799085

	MAIL ADDRESS:	
		STREET 1:		200 LAKE STREET EAST
		CITY:			WAYZATA
		STATE:			MN
		ZIP:			55391-1693

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BANNER CORP
		CENTRAL INDEX KEY:			0000946673
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				911691604
		STATE OF INCORPORATION:			WA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		10 S FIRST AVENUE
		CITY:			WALLA WALLA
		STATE:			WA
		ZIP:			99362
		BUSINESS PHONE:		5095273636

	MAIL ADDRESS:	
		STREET 1:		10 S FIRST AVENUE
		CITY:			WALLA WALLA
		STATE:			WA
		ZIP:			99362

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FIRST WASHINGTON BANCORP INC /WA/
		DATE OF NAME CHANGE:	19980727

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FIRST SAVINGS BANK OF WASHINGTON BANCORP INC
		DATE OF NAME CHANGE:	19950614
</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>2022-03-31</periodOfReport>

    <issuer>
        <issuerCik>0000946673</issuerCik>
        <issuerName>BANNER CORP</issuerName>
        <issuerTradingSymbol>BANR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001583207</rptOwnerCik>
            <rptOwnerName>Costa James M</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>10 SOUTH FIRST AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>WALLA WALLA</rptOwnerCity>
            <rptOwnerState></rptOwnerState>
            <rptOwnerZipCode>99362</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isOfficer>1</isOfficer>
            <officerTitle>Executive VP, Banner Bank</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock,  $0.01 par value per share</value>
            </securityTitle>
            <transactionDate>
                <value>2022-03-31</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>2735</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>58.53</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>5297</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock,  $0.01 par value per share</value>
            </securityTitle>
            <transactionDate>
                <value>2022-03-31</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>4102</value>
                    <footnoteId id="F3"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>58.53</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>9399</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents award pursuant to 2018 Omnibus Incentive Plan; shares vest ratably over a three-year period beginning on March 31, 2022 and ending on the third anniversary thereof. Each restricted stock unit represents the right to receive one share of the Issuer's Common Stock upon vesting. These restricted stock units are subject to forfeiture and to limits on transferability until they vest.</footnote>
        <footnote id="F2">Closing price on March 31, 2022.</footnote>
        <footnote id="F3">Represents award pursuant to 2018 Omnibus Incentive Plan and is subject to the achievement of specified corporate and individual performance goals over a period that began on January 1, 2022 and ends on December 31, 2024. The extent to which the award vests, if at all, depends on the extent to which the performance goals are satisfied. Each restricted stock unit represents the right to receive one share of the Issuer's Common Stock upon vesting. These restricted stock units are subject to forfeiture and to limits on transferability until they vest.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ James M. Costa</signatureName>
        <signatureDate>2022-04-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
