Document and Entity Information Document |
Jul. 16, 2026 |
|---|---|
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Document Period End Date | Jul. 16, 2026 |
| Entity Registrant Name | Commerce Bancshares, Inc. |
| Entity Incorporation, State or Country Code | MO |
| Entity File Number | 001-36502 |
| Entity Tax Identification Number | 43-0889454 |
| Entity Address, Address Line One | 1000 Walnut, |
| Entity Address, City or Town | Kansas City, |
| Entity Address, State or Province | MO |
| Entity Address, Postal Zip Code | 64106 |
| City Area Code | 816 |
| Local Phone Number | 234-2000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | $5 Par Value Common Stock |
| Trading Symbol | CBSH |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Amendment Flag | true |
| Entity Central Index Key | 0000022356 |
| Amendment Description | Subsequent to the issuance of the earnings release and furnishing with the original Form 8-K on July 16, 2026, the Company identified that the growth in assets under administration had been incorrectly described as growth over the same period in the prior year rather than growth over the prior quarter. Therefore, the Company has prepared and furnished as Exhibit 99.1 to this Current Report on Form 8-K/A a corrected earnings release for investors and analysts that highlights the Company's Second Quarter 2026 earnings. The amended earnings release corrects the description of growth in the Company’s assets under administration on the second page of the earnings release. The statement as corrected reads as follows: “Assets under administration grew $3.1 billion, or 3.4%, over the prior quarter.” Apart from the correction of this typographical error, there were no changes to the information provided in the original press release and slide presentation. |