Exhibit 99.1 NEWS RELEASE CONTACT: MARK J. GRESCOVICH, PRESIDENT & CEO ROBERT G. BUTTERFIELD, CFO (509) 527-3636 Banner Corporation Reports Net Income of 37.6Million,or1.09 Per Diluted Share, for First Quarter 2024; Declares Quarterly Cash Dividend of 0.48PerShareWallaWalla,WA−April17,2024−BannerCorporation(NASDAQGSM:BANR)("Banner"),theparentcompanyofBannerBank,todayreportednetincomeof37.6 million, or 1.09perdilutedshare,forthefirstquarterof2024,comparedto42. ...