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Common Stock (Tables)
 9 Months Ended
Sep. 30, 2025
Common Stock [Abstract]  
Summary Of Components Used To Calculate Basic And Diluted Income Per Share
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 September 30For the Nine Months Ended September 30
(In thousands, except per share data)2025202420252024
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.$141,518 $138,007 $425,589 $390,223 
Less income allocated to nonvested restricted stock1,338 1,289 4,058 3,646 
  Net income allocated to common stock$140,180 $136,718 $421,531 $386,577 
Weighted average common shares outstanding132,338 134,217 132,568 134,862 
    Basic income per common share$1.06 $1.02 $3.18 $2.87 
Diluted income per common share:
Net income attributable to Commerce Bancshares, Inc.$141,518 $138,007 $425,589 $390,223 
Less income allocated to nonvested restricted stock1,337 1,288 4,055 3,643 
  Net income allocated to common stock$140,181 $136,719 $421,534 $386,580 
Weighted average common shares outstanding132,338 134,217 132,568 134,862 
Net effect of the assumed exercise of stock-based awards - based on the treasury stock method using the average market price for the respective periods125 178 136 163 
Weighted average diluted common shares outstanding132,463 134,395 132,704 135,025 
    Diluted income per common share$1.06 $1.01 $3.18 $2.86