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Common Stock
 3 Months Ended
Mar. 31, 2025
Common Stock [Abstract]  
Common Stock Common Stock *
Presented below is a summary of the components used to calculate basic and diluted income per share. The Company applies the two-class method of computing income per share, as nonvested share-based awards that pay nonforfeitable 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 table below. Nonvested share-based awards are further discussed in Note 13.

For the Three Months Ended March 31
(In thousands, except per share data)20252024
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.$131,592 $112,663 
Less income allocated to nonvested restricted stock1,259 1,044 
  Net income allocated to common stock$130,333 $111,619 
Weighted average common shares outstanding132,917 135,494 
    Basic income per common share$.98 $.82 
Diluted income per common share:
Net income attributable to Commerce Bancshares, Inc.$131,592 $112,663 
Less income allocated to nonvested restricted stock1,258 1,043 
  Net income allocated to common stock$130,334 $111,620 
Weighted average common shares outstanding132,917 135,494 
Net effect of the assumed exercise of stock-based awards - based on the treasury stock method using the average market price for the respective periods155 151 
Weighted average diluted common shares outstanding133,072 135,645 
    Diluted income per common share$.98 $.82 

Unexercised stock appreciation rights of 159 thousand and 371 thousand for the three month periods ended March 31, 2025 and 2024, respectively, were excluded from the computation of diluted income per common share because their inclusion would have been anti-dilutive.

* All prior year share and per share amounts in this note have been restated for the 5% common stock dividend distributed in December 2024.