<SEC-DOCUMENT>0001127602-25-011639.txt : 20250404
<SEC-HEADER>0001127602-25-011639.hdr.sgml : 20250404
<ACCEPTANCE-DATETIME>20250404134002
ACCESSION NUMBER:		0001127602-25-011639
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20250403
FILED AS OF DATE:		20250404
DATE AS OF CHANGE:		20250404

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Larsen Kenneth A
		CENTRAL INDEX KEY:			0001655207
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-26584
		FILM NUMBER:		25812948

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

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BANNER CORP
		CENTRAL INDEX KEY:			0000946673
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		ORGANIZATION NAME:           	02 Finance
		EIN:				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>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2025-04-03</periodOfReport>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001655207</rptOwnerCik>
            <rptOwnerName>Larsen Kenneth A</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>10 SOUTH FIRST AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>WALLA WALLA</rptOwnerCity>
            <rptOwnerState>WA</rptOwnerState>
            <rptOwnerZipCode>99362</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isOfficer>1</isOfficer>
            <officerTitle>Executive VP, Banner Bank</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock,  $0.01 par value per share</value>
            </securityTitle>
            <transactionDate>
                <value>2025-04-03</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>103</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>60.55</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>25149</value>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Shares relinquished to cover tax obligations on vesting of 421 shares of restricted stock pursuant to 2018 Omnibus Incentive Plan.</footnote>
        <footnote id="F2">Market price on April 3, 2025.</footnote>
        <footnote id="F3">Includes direct ownership of 2,920 shares through Deferred Compensation Plan and 225 shares through an IRA.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Kenneth A. Larsen</signatureName>
        <signatureDate>2025-04-04</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
