Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 140,263	$ 122,700	$ 397,157	$ 373,716
Other comprehensive income (loss)
Net unrealized gains (losses) on available for sale debt securities	215,550	(133,024)	325,225	(72,440)
Change in pension loss	100	199	453	738
Unrealized gains (losses) on cash flow hedge derivatives	15,263	(24,414)	(11,170)	(34,968)
Current period other comprehensive income (loss), net of tax	230,913	(157,239)	314,508	(106,670)
Comprehensive income (loss)	371,176	(34,539)	711,665	267,046
Less non-controlling interest (income) expense	2,256	2,104	6,934	5,879
Comprehensive income (loss) attributable to Commerce Bancshares, Inc.	$ 368,920	$ (36,643)	$ 704,731	$ 261,167