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Regulatory Capital Requirements (Tables)

12 Months Ended

Dec. 31, 2020

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, 2020
Total Capital (to risk-weighted assets):
Commerce Bancshares, Inc. (consolidated)			$	3,189,432		14.82		%				$	1,721,317		8.00		%				N.A.			N.A.
Commerce Bank			2,844,675			13.30						1,710,778			8.00						$	2,138,472		10.00		%
Tier I Capital (to risk-weighted assets):
Commerce Bancshares, Inc. (consolidated)			$	2,950,926		13.71		%				$	1,290,988		6.00		%				N.A.			N.A.
Commerce Bank			2,606,169			12.19						1,283,083			6.00						$	1,710,778		8.00		%
Tier I Common Capital (to risk-weighted assets):
Commerce Bancshares, Inc. (consolidated)			$	2,950,926		13.71		%				$	968,241		4.50		%				N.A.			N.A.
Commerce Bank			2,606,169			12.19						962,312			4.50						$	1,390,007		6.50		%
Tier I Capital (to adjusted quarterly average assets):
(Leverage Ratio)
Commerce Bancshares, Inc. (consolidated)			$	2,950,926		9.45		%				$	1,249,584		4.00		%				N.A.			N.A.
Commerce Bank			2,606,169			8.36						1,246,470			4.00						$	1,558,087		5.00		%
December 31, 2019
Total Capital (to risk-weighted assets):
Commerce Bancshares, Inc. (consolidated)			$	3,052,079		15.48		%				$	1,577,105		8.00		%				N.A.			N.A.
Commerce Bank			2,583,676			13.19						1,566,866			8.00						$	1,958,583		10.00		%
Tier I Capital (to risk-weighted assets):
Commerce Bancshares, Inc. (consolidated)			$	2,890,322		14.66		%				$	1,182,829		6.00		%				N.A.			N.A.
Commerce Bank			2,421,919			12.37						1,175,150			6.00						$	1,566,866		8.00		%
Tier I Common Capital (to risk-weighted assets):
Commerce Bancshares, Inc. (consolidated)			$	2,745,538		13.93		%				$	887,122		4.50		%				N.A.			N.A.
Commerce Bank			2,421,919			12.37						881,362			4.50						$	1,273,079		6.50		%
Tier I Capital (to adjusted quarterly average assets):
(Leverage Ratio)
Commerce Bancshares, Inc. (consolidated)			$	2,890,322		11.38		%				$	1,015,771		4.00		%				N.A.			N.A.
Commerce Bank			2,421,919			9.57						1,012,232			4.00						$	1,265,290		5.00		%

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- References

No definition available.

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- Definition

Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

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