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Fair Value Measurements (Summary of Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning balance $ 184,271us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue $ 194,394us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Total gains or losses (realized/unrealized) included in earnings 19,259us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 (2,737)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
Total gains losses (realized/unrealized) included in other comprehensive income 3,638us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGainLossIncludedInOtherComprehensiveIncomeLoss 3,253us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGainLossIncludedInOtherComprehensiveIncomeLoss
Investment securities called (38,225)cbsh_InvestmentSecuritiesCalled (2,150)cbsh_InvestmentSecuritiesCalled
Discount accretion 2,006cbsh_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion 207cbsh_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion
Purchases of private equity securities 14,152cbsh_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities 3,950cbsh_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities
Sale / paydown of private equity securities (32,464)cbsh_SalesAndRepaymentsOfPrivateEquitySecurities (12,865)cbsh_SalesAndRepaymentsOfPrivateEquitySecurities
Capitalized interest/dividends 144cbsh_CapitalizedInterestOrDividends 331cbsh_CapitalizedInterestOrDividends
Purchase of risk participation agreement 41cbsh_PurchaseOfRiskParticipationAgreement 0cbsh_PurchaseOfRiskParticipationAgreement
Sale of risk participation agreement (321)cbsh_SaleOfRiskParticipationAgreement (112)cbsh_SaleOfRiskParticipationAgreement
Ending balance 152,501us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue 184,271us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end 836cbsh_ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements (5,063)cbsh_ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements
State and Municipal Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning balance 127,724us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
126,414us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Total gains or losses (realized/unrealized) included in earnings 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Total gains losses (realized/unrealized) included in other comprehensive income 3,638us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
3,253us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Investment securities called (38,225)cbsh_InvestmentSecuritiesCalled
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
(2,150)cbsh_InvestmentSecuritiesCalled
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Discount accretion 2,006cbsh_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
207cbsh_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Purchases of private equity securities 0cbsh_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
0cbsh_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Sale / paydown of private equity securities 0cbsh_SalesAndRepaymentsOfPrivateEquitySecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
0cbsh_SalesAndRepaymentsOfPrivateEquitySecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Capitalized interest/dividends 0cbsh_CapitalizedInterestOrDividends
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
0cbsh_CapitalizedInterestOrDividends
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Purchase of risk participation agreement 0cbsh_PurchaseOfRiskParticipationAgreement
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
0cbsh_PurchaseOfRiskParticipationAgreement
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Sale of risk participation agreement 0cbsh_SaleOfRiskParticipationAgreement
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
0cbsh_SaleOfRiskParticipationAgreement
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Ending balance 95,143us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
127,724us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end 0cbsh_ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
0cbsh_ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Private Equity Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning balance 56,612us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
68,167us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
Total gains or losses (realized/unrealized) included in earnings 19,137us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
(2,971)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
Total gains losses (realized/unrealized) included in other comprehensive income 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
Investment securities called 0cbsh_InvestmentSecuritiesCalled
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
0cbsh_InvestmentSecuritiesCalled
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
Discount accretion 0cbsh_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
0cbsh_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
Purchases of private equity securities 14,152cbsh_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
3,950cbsh_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
Sale / paydown of private equity securities (32,464)cbsh_SalesAndRepaymentsOfPrivateEquitySecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
(12,865)cbsh_SalesAndRepaymentsOfPrivateEquitySecurities
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
Capitalized interest/dividends 144cbsh_CapitalizedInterestOrDividends
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
331cbsh_CapitalizedInterestOrDividends
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
Purchase of risk participation agreement 0cbsh_PurchaseOfRiskParticipationAgreement
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
0cbsh_PurchaseOfRiskParticipationAgreement
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
Sale of risk participation agreement 0cbsh_SaleOfRiskParticipationAgreement
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
0cbsh_SaleOfRiskParticipationAgreement
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
Ending balance 57,581us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
56,612us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end 718cbsh_ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
(5,297)cbsh_ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_PrivateEquityFundsMember
Derivatives [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning balance (65)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
(187)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
Total gains or losses (realized/unrealized) included in earnings 122us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
234us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
Total gains losses (realized/unrealized) included in other comprehensive income 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGainLossIncludedInOtherComprehensiveIncomeLoss
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
Investment securities called 0cbsh_InvestmentSecuritiesCalled
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
0cbsh_InvestmentSecuritiesCalled
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
Discount accretion 0cbsh_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
0cbsh_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetDiscountAccretion
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
Purchases of private equity securities 0cbsh_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
0cbsh_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchaseOfPrivateEquitySecurities
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
Sale / paydown of private equity securities 0cbsh_SalesAndRepaymentsOfPrivateEquitySecurities
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
0cbsh_SalesAndRepaymentsOfPrivateEquitySecurities
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
Capitalized interest/dividends 0cbsh_CapitalizedInterestOrDividends
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
0cbsh_CapitalizedInterestOrDividends
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
Purchase of risk participation agreement 41cbsh_PurchaseOfRiskParticipationAgreement
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
0cbsh_PurchaseOfRiskParticipationAgreement
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
Sale of risk participation agreement (321)cbsh_SaleOfRiskParticipationAgreement
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
(112)cbsh_SaleOfRiskParticipationAgreement
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
Ending balance (223)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
(65)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
Total gains or losses for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end $ 118cbsh_ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember
$ 234cbsh_ChangeInUnrealizedGainsOrLossesRelatedToAssetsHeldLevel3FairValueMeasurements
/ us-gaap_FairValueByAssetClassAxis
= cbsh_DerivativeLevelThreeUnobservableInputsMember