Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 534,401	$ 485,177	$ 500,020
Other comprehensive income (loss):
Net unrealized gains (losses) on other securities	172,075	209,914	(1,148,089)
Change in pension loss	1,537	3,590	3,482
Unrealized gains (losses) on cash flow hedge derivatives	(41,111)	(18,052)	(19,337)
Other comprehensive income (loss)	132,501	195,452	(1,163,944)
Comprehensive income (loss)	666,902	680,629	(663,924)
Non-controlling interest expense (income)	8,070	8,117	11,621
Comprehensive income (loss) attributable to Commerce Bancshares, Inc.	$ 658,832	$ 672,512	$ (675,545)