Consolidated Statements Of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
INTEREST INCOME
Interest and fees on loans	$ 288,384	$ 254,194
Interest and fees on loans held for sale	29	23
Interest on investment securities	72,287	76,452
Interest on federal funds sold and short-term securities purchased under agreements to resell	7	29
Interest on Long-Term Securities Purchased Under Agreements To Resell	8,455	7,418
Interest on deposits with banks	27,345	26,249
Total interest income	396,507	364,365
INTEREST EXPENSE
Savings, interest checking and money market	58,557	52,403
Certificates of deposit of less than $100,000	8,083	8,932
Certificates of deposit of $100,000 and over	12,098	13,319
Interest Expense, Federal Funds Purchased	1,280	1,384
Interest Expense, Securities Sold under Agreements to Repurchase	15,780	19,224
Interest on other borrowings	869	1
Total interest expense	96,667	95,263
Net interest income	299,840	269,102
Provision for credit losses	10,960	14,487
Net interest income after credit losses	288,880	254,615
NON-INTEREST INCOME
Trust fee revenue	71,049	56,592
Bank card transaction fees	45,585	45,593
Deposit account charges and other fees	28,578	26,622
Consumer brokerage services	5,444	4,785
Capital market fees	5,338	5,112
Loan fees and sales	3,243	3,404
Other	16,614	16,841
Total non-interest income	175,851	158,949
INVESTMENT SECURITIES GAINS (LOSSES), NET
INVESTMENT SECURITIES GAINS (LOSSES), NET	11,647	(7,591)
NON-INTEREST EXPENSE
Salaries and employee benefits	180,787	153,078
Data processing and software	38,328	32,238
Professional and other services	18,792	10,026
Net occupancy	15,308	14,020
Marketing	6,957	5,843
Equipment	5,671	5,248
Supplies and communication	5,238	5,046
Deposit insurance	3,914	3,744
Other	16,131	9,133
Total non-interest expense	291,126	238,376
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	185,252	167,597
Less income taxes	40,881	36,964
Net income	144,371	130,633
Less non-controlling interest expense (income)	2,748	(959)
Net income attributable to Commerce Bancshares, Inc.	$ 141,623	$ 131,592
Net income per common share — basic	$ 0.96	$ 0.93
Net income per common share — diluted	$ 0.96	$ 0.93