Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 143,622	$ 140,263	$ 428,018	$ 397,157
Other comprehensive income (loss)
Net unrealized gains (losses) on available for sale debt securities	56,893	215,550	226,555	325,225
Change in pension loss	34	100	377	453
Unrealized gains (losses) on cash flow hedge derivatives	(9,544)	15,263	(1,687)	(11,170)
Current period other comprehensive income (loss), net of tax	47,383	230,913	225,245	314,508
Comprehensive income (loss)	191,005	371,176	653,263	711,665
Less non-controlling interest (income) expense	2,104	2,256	2,429	6,934
Comprehensive income (loss) attributable to Commerce Bancshares, Inc.	$ 188,901	$ 368,920	$ 650,834	$ 704,731