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Loans And Allowance For Loan Losses (Credit Quality Of Commercial Loan Portfolio) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Loans And Allowance For Loan Losses [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Commercial $ 6,890,893us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial $ 6,661,674us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
Pass [Member]    
Loans And Allowance For Loan Losses [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Commercial 6,668,353us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 6,441,941us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Special Mention [Member]    
Loans And Allowance For Loan Losses [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Commercial 105,487us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 107,437us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Substandard [Member]    
Loans And Allowance For Loan Losses [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Commercial 87,576us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 77,713us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Non-Accrual [Member]    
Loans And Allowance For Loan Losses [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Commercial 29,477us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= cbsh_NonAccrualMember		 34,583us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= cbsh_NonAccrualMember
Business [Member]    
Loans And Allowance For Loan Losses [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Commercial 4,183,977us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_BusinessLoanMember		 3,969,952us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_BusinessLoanMember
Business [Member] | Pass [Member]    
Loans And Allowance For Loan Losses [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Commercial 4,075,346us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_BusinessLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 3,871,569us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_BusinessLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Business [Member] | Special Mention [Member]    
Loans And Allowance For Loan Losses [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Commercial 65,335us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_BusinessLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 62,904us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_BusinessLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Business [Member] | Substandard [Member]    
Loans And Allowance For Loan Losses [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Commercial 33,335us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_BusinessLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 23,919us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_BusinessLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Business [Member] | Non-Accrual [Member]    
Loans And Allowance For Loan Losses [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Commercial 9,961us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_BusinessLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= cbsh_NonAccrualMember		 11,560us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_BusinessLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= cbsh_NonAccrualMember
Real Estate - Construction And Land [Member]    
Loans And Allowance For Loan Losses [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Commercial 423,928us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_ConstructionAndLandLoansMember		 403,507us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_ConstructionAndLandLoansMember
Real Estate - Construction And Land [Member] | Pass [Member]    
Loans And Allowance For Loan Losses [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Commercial 406,042us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_ConstructionAndLandLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 385,831us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_ConstructionAndLandLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Real Estate - Construction And Land [Member] | Special Mention [Member]    
Loans And Allowance For Loan Losses [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Commercial 5,395us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_ConstructionAndLandLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 3,865us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_ConstructionAndLandLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Real Estate - Construction And Land [Member] | Substandard [Member]    
Loans And Allowance For Loan Losses [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Commercial 8,003us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_ConstructionAndLandLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 8,654us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_ConstructionAndLandLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Real Estate - Construction And Land [Member] | Non-Accrual [Member]    
Loans And Allowance For Loan Losses [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Commercial 4,488us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_ConstructionAndLandLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= cbsh_NonAccrualMember		 5,157us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_ConstructionAndLandLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= cbsh_NonAccrualMember
Real Estate - Business [Member]    
Loans And Allowance For Loan Losses [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Commercial 2,282,988us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_BusinessRealEstateLoanMember		 2,288,215us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_BusinessRealEstateLoanMember
Real Estate - Business [Member] | Pass [Member]    
Loans And Allowance For Loan Losses [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Commercial 2,186,965us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_BusinessRealEstateLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 2,184,541us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_BusinessRealEstateLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Real Estate - Business [Member] | Special Mention [Member]    
Loans And Allowance For Loan Losses [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Commercial 34,757us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_BusinessRealEstateLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 40,668us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_BusinessRealEstateLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Real Estate - Business [Member] | Substandard [Member]    
Loans And Allowance For Loan Losses [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Commercial 46,238us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_BusinessRealEstateLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 45,140us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_BusinessRealEstateLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Real Estate - Business [Member] | Non-Accrual [Member]    
Loans And Allowance For Loan Losses [Line Items]    
Loans and Leases Receivable, Gross, Carrying Amount, Commercial $ 15,028us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_BusinessRealEstateLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= cbsh_NonAccrualMember		 $ 17,866us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= cbsh_BusinessRealEstateLoanMember
/ us-gaap_InternalCreditAssessmentAxis
= cbsh_NonAccrualMember