Common Stock (Tables)

3 Months Ended

Mar. 31, 2017

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 12.

	For the Three Months Ended March 31
(In thousands, except per share data)	2017		2016
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.	$	71,504	$	65,374
Less preferred stock dividends	2,250		2,250
Net income available to common shareholders	69,254		63,124
Less income allocated to nonvested restricted stock	945		894
Net income allocated to common stock	$	68,309	$	62,230
Weighted average common shares outstanding	100,370		100,344
Basic income per common share	$	.68	$	.62
Diluted income per common share:
Net income available to common shareholders	$	69,254	$	63,124
Less income allocated to nonvested restricted stock	942		893
Net income allocated to common stock	$	68,312	$	62,231
Weighted average common shares outstanding	100,370		100,344
Net effect of the assumed exercise of stock-based awards - based on
the treasury stock method using the average market price for the respective periods	397		227
Weighted average diluted common shares outstanding	100,767		100,571
Diluted income per common share	$	.68	$	.62