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Common and Preferred Stock (Summary Of Components Used To Calculate Basic And Diluted Income Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net income attributable to Commerce Bancshares, Inc. $ 354,057 $ 421,231 $ 433,542
Preferred Stock Dividends, Income Statement Impact 11,966 9,000 9,000
Net Income (Loss) Available to Common Stockholders, Basic $ 342,091 $ 412,231 $ 424,542
Basic income per common share (in dollars per share) $ 2.91 $ 3.42 $ 3.44
Diluted income per common share (in dollars per share) $ 2.91 $ 3.41 $ 3.43
Basic Income Per Common Share [Member]      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net income attributable to Commerce Bancshares, Inc. $ 354,057 $ 421,231 $ 433,542
Preferred Stock Dividends, Income Statement Impact 11,966 9,000 9,000
Net Income (Loss) Available to Common Stockholders, Basic 342,091 412,231 424,542
Less income allocated to nonvested restricted stockholders 3,215 4,019 4,558
Net income available to common stockholders $ 338,876 $ 408,212 $ 419,984
Weighted average common shares outstanding 116,360 119,473 122,170
Basic income per common share (in dollars per share) $ 2.91 $ 3.42 $ 3.44
Diluted Income Per Common Share [Member]      
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]      
Net Income (Loss) Available to Common Stockholders, Diluted $ 342,091 $ 412,231 $ 424,542
Less income allocated to nonvested restricted stockholders 3,211 4,012 4,547
Net income available to common stockholders $ 338,880 $ 408,219 $ 419,995
Weighted average common shares outstanding 116,360 119,473 122,170
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 224 297 379
Weighted average diluted common shares outstanding 116,584 119,770 122,549
Diluted income per common share (in dollars per share) $ 2.91 $ 3.41 $ 3.43