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Revenue from Contracts with Customers (Schedule of Contract with Customer, Asset and Liability) (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
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Bank card transaction fees |  |  |  |
Contract with Customer, Asset and Liability [Line Items] |  |  |  |
Contract with Customer, Receivable | $ 14,167 | $ 16,424 | $ 13,349 | $ 14,199
Trust fees |  |  |  |
Contract with Customer, Asset and Liability [Line Items] |  |  |  |
Contract with Customer, Receivable | 2,073 | 2,222 | 2,211 | 2,071
Deposit account charges and other fees |  |  |  |
Contract with Customer, Asset and Liability [Line Items] |  |  |  |
Contract with Customer, Receivable | 5,658 | 6,702 | 5,969 | 6,933
Consumer brokerage services |  |  |  |
Contract with Customer, Asset and Liability [Line Items] |  |  |  |
Contract with Customer, Receivable | $ 632 | $ 391 | $ 513 | $ 432

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- Definition [Line Items] for Disclosure of information about accounts receivable due from contracts with customers. + References No definition available. + Details
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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right to consideration is unconditional. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130534-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 310 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=126942793&loc=d3e3073-115593 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130531-203044 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant

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- Details
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Data Type: | na
Balance Type: |
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- Details
Name: | srt_ProductOrServiceAxis=cbsh_TrustFeesMember
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Data Type: | na
Balance Type: |
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- Details
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Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
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Period Type: |