Common Stock (Tables)

3 Months Ended

Mar. 31, 2015

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)	2015		2014
Basic income per common share:
Net income attributable to Commerce Bancshares, Inc.	$	61,055	$	64,313
Less preferred stock dividends	2,250		—
Net income available to common shareholders	58,805		64,313
Less income allocated to nonvested restricted stock	796		802
Net income allocated to common stock	$	58,009	$	63,511
Weighted average common shares outstanding	95,289		99,511
Basic income per common share	$	.61	$	.64
Diluted income per common share:
Net income available to common shareholders	$	58,805	$	64,313
Less income allocated to nonvested restricted stock	794		799
Net income allocated to common stock	$	58,011	$	63,514
Weighted average common shares outstanding	95,289		99,511
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	299		442
Weighted average diluted common shares outstanding	95,588		99,953
Diluted income per common share	$	.61	$	.64