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Common Stock
 12 Months Ended
Dec. 31, 2025
Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract]  
Common Stock and EPS Common Stock*
On December 16, 2025, the Company distributed a 5% stock dividend on its $5 par common stock for the 32nd consecutive year. All per common share data in this report has been restated to reflect the stock dividend.

The Company applies the two-class method of computing income per share, as nonvested share-based awards that pay non-forfeitable common stock dividends are considered securities which participate in undistributed earnings with common stock. The two-class method requires the calculation of separate income per share amounts for the nonvested share-based awards and for common stock. Income per share attributable to common stock is shown in the following table. Nonvested share-based awards are further discussed in Note 11, Stock-Based Compensation.

Basic income per share is based on the weighted average number of common shares outstanding during the year. Diluted income per share gives effect to all dilutive potential common shares that were outstanding during the year. Presented below is a summary of the components used to calculate basic and diluted income per common share, which have been restated for all stock dividends.

(In thousands, except per share data)202520242023
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.$566,251 $526,331 $477,060 
Less income allocated to nonvested restricted stock5,386 4,914 4,241 
Net income allocated to common stock$560,865 $521,417 $472,819 
Weighted average common shares outstanding
138,773 141,248 143,239 
Basic income per common share
$4.04 $3.69 $3.30 
Diluted income per common share:
Net income attributable to Commerce Bancshares, Inc.$566,251 $526,331 $477,060 
Less income allocated to nonvested restricted stock5,383 4,910 4,237 
Net income allocated to common stock
$560,868 $521,421 $472,823 
Weighted average common shares outstanding
138,773 141,248 143,239 
Net effect of the assumed exercise of stock-based awards - based on the treasury stock method using the average market price for the respective periods127175165
Weighted average diluted common shares outstanding
138,900 141,423 143,404 
Diluted income per common share
$4.04 $3.69 $3.30 
Unexercised stock appreciation rights of 296 thousand, 405 thousand and 400 thousand were excluded from the computation of diluted income per share for the years ended December 31, 2025, 2024 and 2023, respectively, because their inclusion would have been anti-dilutive.

The Company maintains a treasury stock buyback program authorized by its Board of Directors. The most recent authorization in October 2025 approved future purchases of 5,000,000 shares of the Company's common stock. At December 31, 2025, 3,186,721 shares of common stock remained available for purchase under the current authorization.
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)202520242023
Shares outstanding at January 1134,152 130,176 124,999 
Issuance of stock:
Awards and sales under employee and director plans316 453348
5% stock dividend6,578 6,396 6,201 
Other purchases of treasury stock
(3,609)(2,875)(1,355)
Other
50 2 (17)
Shares outstanding at December 31
137,487 134,152 130,176 
* Except as noted in the above table, all share and per share amounts in this footnote have been restated for the 5% common stock dividend distributed in 2025.