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Common Stock (Tables)
 6 Months Ended
Jun. 30, 2023
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 June 30For the Six Months Ended June 30
(In thousands, except per share data)2023202220232022
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.$127,789 $115,794 $247,241 $233,948 
Less income allocated to nonvested restricted stock1,128 1,052 2,184 2,122 
  Net income allocated to common stock$126,661 $114,742 $245,057 $231,826 
Weighted average common shares outstanding123,885 125,637 123,944 125,987 
   Basic income per common share$1.03 $.92 $1.98 $1.84 
Diluted income per common share:
Net income attributable to Commerce Bancshares, Inc.$127,789 $115,794 $247,241 $233,948 
Less income allocated to nonvested restricted stock1,128 1,050 2,182 2,118 
  Net income allocated to common stock$126,661 $114,744 $245,059 $231,830 
Weighted average common shares outstanding123,885 125,637 123,944 125,987 
Net effect of the assumed exercise of stock-based awards - based on the treasury stock method using the average market price for the respective periods122 279 188 293 
  Weighted average diluted common shares outstanding124,007 125,916 124,132 126,280 
    Diluted income per common share$1.02 $.92 $1.97 $1.84