Consolidated Statements Of Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
INTEREST INCOME
Interest and fees on loans		$ 1,062,771	$ 984,397	$ 646,293
Interest on loans held for sale		165	583	637
Interest on investment securities		271,774	278,755	313,892
Interest on federal funds sold		49	659	412
Interest on securities purchased under agreements to resell		13,358	13,649	22,647
Interest on deposits with banks		121,440	103,248	15,098
Total interest income		1,469,557	1,381,291	998,979
INTEREST EXPENSE
Savings, interest checking and money market		226,876	146,392	25,099
Certificates of deposit of less than $100,000		42,226	38,690	1,469
Certificates of deposit of $100,000 and over		67,060	61,057	3,898
Interest on federal funds purchased		12,221	25,265	1,836
Interest on securities sold under agreements to repurchase		80,908	73,164	24,022
Interest on other borrowings		20	38,594	470
Total interest expense		429,311	383,162	56,794
Net interest income		1,040,246	998,129	942,185
Provision for loan losses		32,903	35,451	28,071
Net interest income after provision for loan losses		1,007,343	962,678	914,114
NON-INTEREST INCOME
Trust fees		214,430	190,954	184,719
Bank card transaction fees		189,784	191,156	176,144
Deposit account charges and other fees		100,336	90,992	94,381
Capital market fees		19,776	14,100	14,231
Consumer brokerage services		18,141	17,223	19,117
Loan fees and sales		12,890	11,165	13,141
Other		60,196	57,455	44,802
Total non-interest income		615,553	573,045	546,535
INVESTMENT SECURITIES GAINS (LOSSES), NET
Investment securities gains (losses), net	[1]	7,823	14,985	20,506
NON-INTEREST EXPENSE
Salaries and employee benefits		607,862	584,063	554,047
Data processing and software		127,390	118,758	110,692
Net occupancy		53,223	53,629	49,117
Professional and other services		35,077	36,198	35,805
Marketing		22,353	24,511	23,827
Equipment		20,619	19,548	19,359
Supplies and communication		19,291	19,420	18,101
Deposit insurance		16,482	33,163	10,583
Other		48,932	41,692	27,246
Total non-interest expense		951,229	930,982	848,777
Income before income taxes		679,490	619,726	632,378
Less income taxes		145,089	134,549	132,358
Net income		534,401	485,177	500,020
Less non-controlling interest expense (income)		8,070	8,117	11,621
NET INCOME ATTRIBUTABLE TO COMMERCE BANCSHARES, INC.		$ 526,331	$ 477,060	$ 488,399
Net income per common share - basic (in dollars per share)		$ 3.88	$ 3.47	$ 3.50
Net income per common share - diluted (in dollars per share)		$ 3.87	$ 3.46	$ 3.50

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