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Loans And Allowance For Credit Losses (Total Impaired Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
Non-accrual loans	$ 26,540	$ 10,220
Accruing Restructured Loans		71,512
Total impaired loans		$ 81,732

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- Definition

Loans classified as troubled debt restructurings but are not on non-accrual status. Includes (1) loans renewed at interest rates judged not to be market rates for new debt with similar risk, and as a result were classified as troubled debt restructurings under ASC 310-40 but continue to perform in accordance with their modified terms, (2) certain credit card loans under various debt management and assistance programs, and (3) loans classified as troubled debt restructurings because they had not been reaffirmed by the borrower in bankruptcy proceedings but for which the borrowers continue to make payments.

+ References

No definition available.

+ Details

Name:	cbsh_AccruingRestructuredLoans
Namespace Prefix:	cbsh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Amount of financing receivable on nonaccrual status.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953550-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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