Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 130,463	$ 120,153	$ 251,016	$ 240,179
Other comprehensive income (loss)
Net unrealized gains (losses) on available for sale debt securities	(81,882)	(328,201)	60,584	(835,466)
Change in pension loss	269	322	539	645
Unrealized gains (losses) on cash flow hedge derivatives	(14,184)	(4,615)	(10,554)	(9,153)
Current period other comprehensive income (loss), net of tax	(95,797)	(332,494)	50,569	(843,974)
Comprehensive income (loss)	34,666	(212,341)	301,585	(603,795)
Less non-controlling interest (income) expense	2,674	4,359	3,775	6,231
Comprehensive income (loss) attributable to Commerce Bancshares, Inc.	$ 31,992	$ (216,700)	$ 297,810	$ (610,026)