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Common Stock (Tables)
 6 Months Ended
Jun. 30, 2020
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 contain nonforfeitable rights to 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)2020201920202019
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.$39,863  $107,971  $91,720  $205,109  
Less preferred stock dividends2,250  2,250  4,500  4,500  
Net income available to common shareholders37,613  105,721  87,220  200,609  
Less income allocated to nonvested restricted stock353  1,012  823  1,956  
  Net income allocated to common stock$37,260  $104,709  $86,397  $198,653  
Weighted average common shares outstanding110,707  114,961  110,913  115,234  
   Basic income per common share$.34  $.91  $.78  $1.72  
Diluted income per common share:
Net income available to common shareholders$37,613  $105,721  $87,220  $200,609  
Less income allocated to nonvested restricted stock354  1,009  823  1,952  
  Net income allocated to common stock$37,259  $104,712  $86,397  $198,657  
Weighted average common shares outstanding110,707  114,961  110,913  115,234  
  Net effect of the assumed exercise of stock-based awards - based on
the treasury stock method using the average market price for the respective periods190  279  223  292  
  Weighted average diluted common shares outstanding110,897  115,240  111,136  115,526  
    Diluted income per common share$.34  $.91  $.78  $1.72