Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 122,700	$ 126,187	$ 373,716	$ 366,366
Other comprehensive income (loss)
Net unrealized gains (losses) on available for sale debt securities	(133,024)	(345,565)	(72,440)	(1,181,031)
Change in pension loss	199	302	738	947
Unrealized gains (losses) on cash flow hedge derivatives	(24,414)	(7,187)	(34,968)	(16,340)
Current period other comprehensive income (loss), net of tax	(157,239)	(352,450)	(106,670)	(1,196,424)
Comprehensive income (loss)	(34,539)	(226,263)	267,046	(830,058)
Less non-controlling interest (income) expense	2,104	3,364	5,879	9,595
Comprehensive income (loss) attributable to Commerce Bancshares, Inc.	$ (36,643)	$ (229,627)	$ 261,167	$ (839,653)