Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 540,590	$ 353,885	$ 422,712
Other comprehensive income (loss):
Net unrealized gains (losses) on securities for which a portion of an other-than-temporary impairment has been recorded in earnings	0	0	(632)
Net unrealized gains (losses) on other securities	(240,627)	161,728	151,122
Change in pension loss	4,450	(3,178)	1,167
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent	(18,120)	62,383	23,456
Other comprehensive income (loss)	(254,297)	220,933	175,113
Comprehensive income	286,293	574,818	597,825
Non-controlling interest expense (income)	9,825	(172)	1,481
Comprehensive income attributable to Commerce Bancshares, Inc.	$ 276,468	$ 574,990	$ 596,344