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Common Stock (Tables)
 3 Months Ended
Mar. 31, 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 March 31
(In thousands, except per share data)20222021
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.$118,154 $130,972 
Less income allocated to nonvested restricted stock1,070 1,200 
  Net income allocated to common stock$117,084 $129,772 
Weighted average common shares outstanding120,324 122,073 
   Basic income per common share$.97 $1.06 
Diluted income per common share:
Net income attributable to Commerce Bancshares, Inc.$118,154 $130,972 
Less income allocated to nonvested restricted stock1,068 1,198 
  Net income allocated to common stock$117,086 $129,774 
Weighted average common shares outstanding120,324 122,073 
Net effect of the assumed exercise of stock-based awards - based on the treasury stock method using the average market price for the respective periods292 329 
  Weighted average diluted common shares outstanding120,616 122,402 
    Diluted income per common share$.97 $1.06