Cover
Cover | Oct. 24, 2024 |
Cover [Abstract] | |
Document Type | 8-K |
Document Period End Date | Oct. 24, 2024 |
Entity Registrant Name | Columbia Banking System, Inc. |
Entity Incorporation, State or Country Code | WA |
Entity File Number | 000-20288 |
Entity Tax Identification Number | 91-1422237 |
Entity Address, Address Line One | 1301 A Street |
Entity Address, City or Town | Tacoma |
Entity Address, State or Province | WA |
Entity Address, Postal Zip Code | 98402-2156 |
City Area Code | 253 |
Local Phone Number | 305-1900 |
Written Communications | false |
Soliciting Material | false |
Pre-commencement Tender Offer | false |
Pre-commencement Issuer Tender Offer | false |
Title of 12(g) Security | Common Stock, No Par Value |
Trading Symbol | COLB |
Security Exchange Name | NASDAQ |
Entity Emerging Growth Company | false |
Entity Central Index Key | 0000887343 |
Amendment Flag | false |