Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 126,187	$ 125,754	$ 366,366	$ 425,232
Other comprehensive income (loss)
Net unrealized losses on available for sale debt securities	(345,565)	(57,068)	(1,181,031)	(160,019)
Pension loss amortization	302	451	947	1,326
Unrealized losses on cash flow hedge derivatives	(7,187)	(4,607)	(16,340)	(13,518)
Current period other comprehensive income (loss), net of tax	(352,450)	(61,224)	(1,196,424)	(172,211)
Comprehensive income (loss)	(226,263)	64,530	(830,058)	253,021
Less non-controlling interest expense	3,364	3,193	9,595	9,373
Comprehensive income (loss) attributable to Commerce Bancshares, Inc.	$ (229,627)	$ 61,337	$ (839,653)	$ 243,648