Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 120,026	$ 133,229
Other comprehensive income (loss)
Net unrealized losses on available for sale debt securities	(507,265)	(158,676)
Pension loss amortization	323	437
Unrealized losses on cash flow hedge derivatives	(4,538)	(4,386)
Current period other comprehensive income (loss), net of tax	(511,480)	(162,625)
Comprehensive income (loss)	(391,454)	(29,396)
Less non-controlling interest expense	1,872	2,257
Comprehensive income (loss) attributable to Commerce Bancshares, Inc.	$ (393,326)	$ (31,653)