Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 141,442	$ 130,463	$ 256,894	$ 251,016
Other comprehensive income (loss)
Net unrealized gains (losses) on available for sale debt securities	130,076	(81,882)	109,675	60,584
Change in pension loss	177	269	353	539
Unrealized gains (losses) on cash flow hedge derivatives	(7,043)	(14,184)	(26,433)	(10,554)
Current period other comprehensive income (loss), net of tax	123,210	(95,797)	83,595	50,569
Comprehensive income (loss)	264,652	34,666	340,489	301,585
Less non-controlling interest (income) expense	1,889	2,674	4,678	3,775
Comprehensive income (loss) attributable to Commerce Bancshares, Inc.	$ 262,763	$ 31,992	$ 335,811	$ 297,810