Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 120,153	$ 166,249	$ 240,179	$ 299,478
Other comprehensive income (loss)
Net unrealized losses on available for sale debt securities	(328,201)	55,725	(835,466)	(102,951)
Pension loss amortization	322	438	645	875
Unrealized losses on cash flow hedge derivatives	(4,615)	(4,525)	(9,153)	(8,911)
Current period other comprehensive income (loss), net of tax	(332,494)	51,638	(843,974)	(110,987)
Comprehensive income (loss)	(212,341)	217,887	(603,795)	188,491
Less non-controlling interest expense	4,359	3,923	6,231	6,180
Comprehensive income (loss) attributable to Commerce Bancshares, Inc.	$ (216,700)	$ 213,964	$ (610,026)	$ 182,311