Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 485,177	$ 500,020	$ 540,590
Other comprehensive income (loss):
Net unrealized gains (losses) on other securities	209,914	(1,148,089)	(240,627)
Change in pension loss	3,590	3,482	4,450
Unrealized gains (losses) on cash flow hedge derivatives	(18,052)	(19,337)	(18,120)
Other comprehensive income (loss)	195,452	(1,163,944)	(254,297)
Comprehensive income (loss)	680,629	(663,924)	286,293
Non-controlling interest expense (income)	8,117	11,621	9,825
Comprehensive income (loss) attributable to Commerce Bancshares, Inc.	$ 672,512	$ (675,545)	$ 276,468