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Stock-Based Compensation (Summary Of The Status Of Nonvested Share Awards) (Details) | 9 Months Ended
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Sep. 30, 2022 $ / shares shares
Nonvested Share Awards [Roll Forward] |
Nonvested, Shares, Beginning Balance | shares | 1,120,491
Granted, Shares | shares | 263,497
Vested, Shares | shares | (262,579)
Forfeited, Shares | shares | (23,145)
Nonvested, Shares, Ending Balance | shares | 1,098,264
Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares | $ 55.58
Granted , Weighted Average Grant Date Fair Value | $ / shares | 70.76
Vested , Weighted Average Grant Date Fair Value | $ / shares | 47.78
Forfeited , Weighted Average Grant Date Fair Value | $ / shares | 60.08
Nonvested , Weighted Average Grant Date Fair Value, Ending Balance | $ / shares | $ 61.00

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- Definition Nonvested Share Awards, Beginning and Ending Balances + References No definition available. + Details
Name: | cbsh_NonvestedShareAwardsBalances
Namespace Prefix: | cbsh_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of nonvested shares that were forfeited during the reporting period. + References No definition available. + Details
Name: | cbsh_NonvestedShareAwardsForfeitedInPeriod
Namespace Prefix: | cbsh_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of nonvested shares that were granted during the reporting period. + References No definition available. + Details
Name: | cbsh_NonvestedShareAwardsGrantedInPeriod
Namespace Prefix: | cbsh_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of nonvested shares that vested during the reporting period + References No definition available. + Details
Name: | cbsh_NonvestedShareAwardsVestedInPeriod
Namespace Prefix: | cbsh_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Nonvested Share Awards Vested In Period Weighted Average Grant Date Fair Value + References No definition available. + Details
Name: | cbsh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsNonvestedShareAwardsVestedInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | cbsh_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Nonvested Share Awards Weighted Average Grant Date Unit Fair Value + References No definition available. + Details
Name: | cbsh_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsNonvestedShareAwardsWeightedAverageGrantDateUnitFairValue
Namespace Prefix: | cbsh_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Share-Based Compensation, Forfeited, Nonvested Share Award, Weighted Average Grant Date Fair Value + References No definition available. + Details
Name: | cbsh_ShareBasedCompensationForfeitedNonvestedShareAwardWeightedAverageGrantDateFairValue
Namespace Prefix: | cbsh_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Share Based Compensation, Granted, Nonvested Share Award Weighted Average Grant Date Fair Value + References No definition available. + Details
Name: | cbsh_ShareBasedCompensationGrantedNonvestedShareAwardWeightedAverageGrantDateFairValue
Namespace Prefix: | cbsh_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration