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Common and Preferred Stock (Tables)
 12 Months Ended
Dec. 31, 2022
Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract]  
Summary Of Components Used To Calculate Basic And Diluted Income Per Share
(In thousands, except per share data)202220212020
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.$488,399 $530,765 $354,057 
Less preferred stock dividends— — 11,966 
Net income available to common shareholders488,399 530,765 342,091 
Less income allocated to nonvested restricted stock4,450 4,846 3,215 
Net income allocated to common stock$483,949 $525,919 $338,876 
Weighted average common shares outstanding
125,275 127,738 128,286 
Basic income per common share
$3.86 $4.12 $2.64 
Diluted income per common share:
Net income available to common shareholders$488,399 $530,765 $342,091 
Less income allocated to nonvested restricted stock4,442 4,838 3,211 
Net income allocated to common stock
$483,957 $525,927 $338,880 
Weighted average common shares outstanding
125,275 127,738 128,286 
Net effect of the assumed exercise of stock-based awards - based on the treasury stock method using the average market price for the respective periods285300248
Weighted average diluted common shares outstanding
125,560 128,038 128,534 
Diluted income per common share
$3.85 $4.11 $2.64 
Schedule Of Activity In The Outstanding Shares Of The Company's Common Stock
The table below shows activity in the outstanding shares of the Company’s common stock during the past three years. Shares in the table below are presented on an historical basis and have not been restated for the annual 5% stock dividends.

Years Ended December 31
(In thousands)202220212020
Shares outstanding at January 1121,436 117,138 112,132 
Issuance of stock:
Awards and sales under employee and director plans306 328335
5% stock dividend5,953 5,790 5,574 
Other purchases of treasury stock
(2,684)(1,807)(887)
Other
(12)(13)(16)
Shares outstanding at December 31
124,999 121,436 117,138