Common Stock (Tables)

3 Months Ended

Mar. 31, 2016

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)	2016		2015
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.	$	65,374	$	61,055
Less preferred stock dividends	2,250		2,250
Net income available to common shareholders	63,124		58,805
Less income allocated to nonvested restricted stock	894		796
Net income allocated to common stock	$	62,230	$	58,009
Weighted average common shares outstanding	95,566		100,053
Basic income per common share	$	.65	$	.58
Diluted income per common share:
Net income available to common shareholders	$	63,124	$	58,805
Less income allocated to nonvested restricted stock	893		794
Net income allocated to common stock	$	62,231	$	58,011
Weighted average common shares outstanding	95,566		100,053
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	216		314
Weighted average diluted common shares outstanding	95,782		100,367
Diluted income per common share	$	.65	$	.58