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Common Stock (Tables)
 6 Months Ended
Jun. 30, 2022
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)2022202120222021
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.$115,794 $162,326 $233,948 $293,298 
Less income allocated to nonvested restricted stock1,052 1,478 2,122 2,678 
  Net income allocated to common stock$114,742 $160,848 $231,826 $290,620 
Weighted average common shares outstanding119,655 121,971 119,988 122,022 
   Basic income per common share$.96 $1.32 $1.93 $2.38 
Diluted income per common share:
Net income attributable to Commerce Bancshares, Inc.$115,794 $162,326 $233,948 $293,298 
Less income allocated to nonvested restricted stock1,050 1,475 2,118 2,673 
  Net income allocated to common stock$114,744 $160,851 $231,830 $290,625 
Weighted average common shares outstanding119,655 121,971 119,988 122,022 
Net effect of the assumed exercise of stock-based awards - based on the treasury stock method using the average market price for the respective periods265 302 278 315 
  Weighted average diluted common shares outstanding119,920 122,273 120,266 122,337 
    Diluted income per common share$.96 $1.32 $1.93 $2.38