v3.25.2
Common Stock (Summary Of Components Used To Calculate Basic And Diluted Income Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Basic income per common share $ 1.14 $ 1.03 $ 2.12 $ 1.85
Diluted income per common share $ 1.14 $ 1.03 $ 2.12 $ 1.85
Basic income per common share:        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income attributable to Commerce Bancshares, Inc. $ 152,479 $ 139,553 $ 284,071 $ 252,216
Less income allocated to nonvested restricted stock 1,461 1,313 2,720 2,357
Net income allocated to common stock $ 151,018 $ 138,240 $ 281,351 $ 249,859
Weighted average common shares outstanding 132,455 134,881 132,685 135,187
Basic income per common share $ 1.14 $ 1.03 $ 2.12 $ 1.85
Diluted income per common share:        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income attributable to Commerce Bancshares, Inc. $ 152,479 $ 139,553 $ 284,071 $ 252,216
Less income allocated to nonvested restricted stock 1,460 1,312 2,718 2,355
Net income allocated to common stock $ 151,019 $ 138,241 $ 281,353 $ 249,861
Weighted average common shares outstanding 132,455 134,881 132,685 135,187
Net effect of the assumed exercise of stock-based awards - based on the treasury stock method using the average market price for the respective periods 128 160 141 156
Weighted average diluted common shares outstanding 132,583 135,041 132,826 135,343
Diluted income per common share $ 1.14 $ 1.03 $ 2.12 $ 1.85