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Business Combinations - Schedule if purchase price (Details) - Columbia Banking Systems and Pacific Premier Bancorp Merger
$ / shares in Units, $ in Millions
Aug. 31, 2025
USD ($)
$ / shares
shares
Business Combination [Line Items]  
Shares of Columbia common stock issued to Pacific Premier Stockholders | shares 87,632,000
Columbia's market price per common share (in dollars) as of August 31, 2025 | $ / shares $ 26.77
Fair value of purchase price consideration transferred $ 2,346
Fair value of restricted stock exchanged 9
Total purchase price consideration $ 2,355