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Common Stock
 3 Months Ended
Mar. 31, 2022
Common Stock [Abstract]  
Common Stock Common Stock *
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 

Unexercised stock appreciation rights of 119 thousand and 54 thousand for the three month periods ended March 31, 2022 and 2021, respectively, were excluded from the computation of diluted income per common share because their inclusion would have been anti-dilutive.

* All prior year share and per share amounts in this note have been restated for the 5% common stock dividend distributed in December 2021.