Regulatory Capital Requirements (Tables)

12 Months Ended

Dec. 31, 2023

Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]

Schedule Of Capital Amounts And Ratios On Consolidated Basis

The following tables show the capital amounts and ratios for the Company (on a consolidated basis) and the Bank, together with the minimum capital adequacy and well-capitalized capital requirements, at the last two year ends.

	Actual				Minimum Capital Adequacy Requirement				Well-Capitalized Capital Requirement
(Dollars in thousands)	Amount		Ratio		Amount		Ratio		Amount		Ratio
December 31, 2023
Total Capital (to risk-weighted assets):
Commerce Bancshares, Inc. (consolidated)	$	3,881,024	16.03	%	$	1,937,322	8.00	%	N.A.		N.A.
Commerce Bank	3,313,640		13.81		1,919,257		8.00		$	2,399,071	10.00	%
Tier I Capital (to risk-weighted assets):
Commerce Bancshares, Inc. (consolidated)	$	3,693,089	15.25	%	$	1,452,992	6.00	%	N.A.		N.A.
Commerce Bank	3,125,706		13.03		1,439,443		6.00		$	1,919,257	8.00	%
Tier I Common Capital (to risk-weighted assets):
Commerce Bancshares, Inc. (consolidated)	$	3,693,089	15.25	%	$	1,089,744	4.50	%	N.A.		N.A.
Commerce Bank	3,125,706		13.03		1,079,582		4.50		$	1,559,396	6.50	%
Tier I Capital (to adjusted quarterly average assets):
(Leverage Ratio)
Commerce Bancshares, Inc. (consolidated)	$	3,693,089	11.25	%	$	1,313,377	4.00	%	N.A.		N.A.
Commerce Bank	3,125,706		9.56		1,307,174		4.00		$	1,633,968	5.00	%
December 31, 2022
Total Capital (to risk-weighted assets):
Commerce Bancshares, Inc. (consolidated)	$	3,600,920	14.89	%	$	1,934,274	8.00	%	N.A.		N.A.
Commerce Bank	3,125,987		13.05		1,916,529		8.00		$	2,395,661	10.00	%
Tier I Capital (to risk-weighted assets):
Commerce Bancshares, Inc. (consolidated)	$	3,417,223	14.13	%	$	1,450,705	6.00	%	N.A.		N.A.
Commerce Bank	2,942,291		12.28		1,437,397		6.00		$	1,916,529	8.00	%
Tier I Common Capital (to risk-weighted assets):
Commerce Bancshares, Inc. (consolidated)	$	3,417,223	14.13	%	$	1,088,029	4.50	%	N.A.		N.A.
Commerce Bank	2,942,291		12.28		1,078,047		4.50		$	1,557,180	6.50	%
Tier I Capital (to adjusted quarterly average assets):
(Leverage Ratio)
Commerce Bancshares, Inc. (consolidated)	$	3,417,223	10.34	%	$	1,322,102	4.00	%	N.A.		N.A.
Commerce Bank	2,942,291		8.86		1,328,220		4.00		$	1,660,275	5.00	%