Consolidated Statements Of Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
INTEREST INCOME
Interest and fees on loans		$ 646,293	$ 570,549	$ 612,072
Interest on loans held for sale		637	880	860
Interest on investment securities		313,892	236,278	216,793
Interest on federal funds sold and short-term securities purchased under agreements to resell		412	4	3
Interest on Long-Term Securities Purchased Under Agreements To Resell		22,647	37,377	40,647
Interest on deposits with banks		15,098	3,202	2,273
Total interest income		998,979	848,290	872,648
INTEREST EXPENSE
Savings, interest checking and money market		25,099	7,509	17,851
Certificates of deposit of less than $100,000		1,469	1,158	4,897
Certificates of deposit of $100,000 and over		3,898	2,577	12,948
Interest on federal funds purchased and securities sold under agreements to repurchase		25,858	1,646	6,091
Interest on other borrowings		470	(24)	1,014
Total interest expense		56,794	12,866	42,801
Net interest income		942,185	835,424	829,847
Provision for loan losses		28,071	(66,326)	137,190
Net interest income after provision for loan losses		914,114	901,750	692,657
NON-INTEREST INCOME
Trust fees		184,719	188,227	160,637
Bank card transaction fees		176,144	167,891	151,797
Deposit account charges and other fees		94,381	97,217	93,227
Consumer brokerage		19,117	18,362	15,095
Capital market fees		14,231	15,943	14,582
Loan fees and sales		13,141	29,720	26,684
Other		44,802	43,033	43,845
Total non-interest income		546,535	560,393	505,867
INVESTMENT SECURITIES GAINS (LOSSES), NET
Investment securities gains (losses), net	[1]	20,506	30,059	11,032
NON-INTEREST EXPENSE
Salaries and employee benefits		554,047	525,248	512,987
Data processing and software		110,692	101,792	95,325
Net occupancy		49,117	48,185	46,645
Equipment		19,359	18,089	18,839
Supplies and communication		18,101	17,118	17,419
Marketing		23,827	21,856	19,734
Other		73,634	73,613	57,429
Total non-interest expense		848,777	805,901	768,378
Income before income taxes		632,378	686,301	441,178
Less income taxes		132,358	145,711	87,293
Net income		500,020	540,590	353,885
Less non-controlling interest expense (income)		11,621	9,825	(172)
NET INCOME ATTRIBUTABLE TO COMMERCE BANCSHARES, INC.		488,399	530,765	354,057
Preferred stock dividends		0	0	11,966
Net Income (Loss) Available to Common Stockholders, Basic		$ 488,399	$ 530,765	$ 342,091
Net income per common share - basic (in dollars per share)		$ 3.86	$ 4.12	$ 2.64
Net income per common share - diluted (in dollars per share)		$ 3.85	$ 4.11	$ 2.64

[1] Available for sale debt securities, equity securities, and other securities.