Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net income	$ 144,371	$ 130,633
Other comprehensive income (loss)
Net unrealized gains (losses) on available for sale debt securities	(30,550)	118,288
Change in pension loss	103	172
Unrealized gains (losses) on cash flow hedge derivatives	(1,455)	5,875
Current period other comprehensive income (loss), net of tax	(31,902)	124,335
Comprehensive income (loss)	112,469	254,968
Less non-controlling interest (income) expense	2,748	(959)
Comprehensive income (loss) attributable to Commerce Bancshares, Inc.	$ 109,721	$ 255,927