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ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31 , 2020 Washington ( State or other jurisdiction of incorporation or organization ) OR □ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM to UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 Common Stock , par value $ .01 per ( Title of Each Class ) FORM 10 - K share 10 South First Avenue , Walla Walla , Washington 99362 ( Address of principal executive offices and zip code ) Registrant's telephone number , including area code : ( 509 ) 527-3636 Securities registered pursuant to Section 12 ( b ) of the Act : BANR Commission File Number 0-26584 BANNER CORPORATION ( Exact name of registrant as specified in its charter ) ( Trading Symbol ) Securities registered pursuant to section 12 ( g ) of the Act : None . Large accelerated filer X Accelerated filer 91-1691604 ( I.R.S. Employer Identification Number ) The NASDAQ Stock Market LLC ( Name of Each Exchange on Which Registered ) Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act Yes X No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act Yes No X Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes_X_ No Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) Yes X No Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulations S - K is not contained herein , and will not be contained , to the best of registrant's knowledge , in definitive proxy or information statements incorporated by reference in Part III of this Form 10 - K or any amendment to this Form 10 - K . Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company or emerging growth company . See definition of " large accelerated filer , " " accelerated filer , " " smaller reporting company " and emerging growth company in Rule 12b - 2 of the Exchange Act : Non - accelerated filer Smaller reporting company Emerging growth company If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards pursuant to Section 13 ( a ) of the Exchange Act . Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U. S. C 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Yes X No Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) Yes The aggregate market value of the voting and non - voting common equity held by nonaffiliates of the registrant based on the closing sales price of the registrant's common stock quoted on The NASDAQ Stock Market on June 30 , 2020 , was : Common Stock - $ 1,320,288,340 No X