Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 500,020	$ 540,590	$ 353,885
Other comprehensive income (loss):
Net unrealized gains (losses) on other securities	(1,148,089)	(240,627)	161,728
Change in pension loss	3,482	4,450	(3,178)
Unrealized gains (losses) on cash flow hedge derivatives	(19,337)	(18,120)	62,383
Other comprehensive income (loss)	(1,163,944)	(254,297)	220,933
Comprehensive income (loss)	(663,924)	286,293	574,818
Non-controlling interest expense (income)	11,621	9,825	(172)
Comprehensive income (loss) attributable to Commerce Bancshares, Inc.	$ (675,545)	$ 276,468	$ 574,990