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Deposits (Maturities Of Time Open And Certificates Of Deposit Detailed Breakdown By Size Category) (Details) (USD $)
Dec. 31, 2014
Deposits [Abstract]  
Certificates Of Deposit under $100,000, Due in 3 months or less $ 145,232,000cbsh_ContractualMaturitiesCertificatesOfDepositUnder100000ThreeMonthsOrLess
Certificates Of Deposit under $100,000, Due in over 3 through 6 months 155,693,000cbsh_ContractualMaturitiesCertificatesOfDepositUnder100000ThreeMonthsThroughSixMonths
Certificates Of Deposit under $100,000, Due in over 6 through 12 months 260,582,000cbsh_ContractualMaturitiesCertificatesOfDepositUnder100000SixMonthsThroughTwelveMonths
Certificates Of Deposit under $100,000, Due in over 12 months 135,960,000cbsh_ContractualMaturitiesCertificatesOfDepositUnder100000AfterTwelveMonths
Certificates Of Deposit under $100,000 697,467,000cbsh_CertificatesOfDepositUnder100000
Other Time Deposits under $100,000, Due in 3 months or less 30,779,000cbsh_ContractualMaturitiesOtherTimeDepositsUnder100000ThreeMonthsOrLess
Other Time Deposits under $100,000, Due in over 3 through 6 months 35,553,000cbsh_ContractualMaturitiesOtherTimeDepositsUnder100000ThreeMonthsThroughSixMonths
Other Time Deposits under $100,000, Due in over 6 through 12 months 49,132,000cbsh_ContractualMaturitiesOtherTimeDepositsUnder100000SixMonthsThroughTwelveMonths
Other Time Deposits under $100,000, Due in over 12 months 65,502,000cbsh_ContractualMaturitiesOtherTimeDepositsUnder100000AfterTwelveMonths
Other Time Deposits under $100,000 180,966,000cbsh_OtherTimeDepositsUnder100000
Certificates Of Deposit over $100,000, Due in 3 months or less 363,581,000cbsh_ContractualMaturitiesCertificatesOfDepositOver100000ThreeMonthsOrLess
Certificates Of Deposit over $100,000, Due in over 3 through 6 months 272,824,000cbsh_ContractualMaturitiesCertificatesOfDepositOver100000ThreeMonthsThroughSixMonths
Certificates Of Deposit over $100,000, Due in over 6 through 12 months 238,723,000cbsh_ContractualMaturitiesCertificatesOfDepositOver100000SixMonthsThroughTwelveMonths
Certificates Of Deposit over $100,000, Due in over 12 months 268,887,000cbsh_ContractualMaturitiesCertificatesOfDepositOver100000AfterTwelveMonths
Certificates Of Deposit over $100,000 1,144,015,000cbsh_CertificatesOfDepositOver100000
Other Time Deposits over $100,000, Due in 3 months or less 12,646,000cbsh_ContractualMaturitiesOtherTimeDepositsOver100000ThreeMonthsOrLess
Other Time Deposits over $100,000, Due in over 3 through 6 months 28,172,000cbsh_ContractualMaturitiesOtherTimeDepositsOver100000ThreeMonthsThroughSixMonths
Other Time Deposits over $100,000, Due in over 6 through 12 months 45,415,000cbsh_ContractualMaturitiesOtherTimeDepositsOver100000SixMonthsThroughTwelveMonths
Other Time Deposits other $100,000, Due in over 12 months 13,537,000cbsh_ContractualMaturitiesOtherTimeDepositsOver100000AfterTwelveMonths
Other Time Deposits over $100,000 99,770,000cbsh_OtherTimeDepositsOver100000
Due in 3 months or less, Total 552,238,000cbsh_ContractualMaturitiesTimeDepositsThreeMonthsOrLessNet
Due in over 3 through 6 months, Total 492,242,000cbsh_ContractualMaturitiesTimeDepositsThreeMonthsThroughSixMonthsNet
Due in over 6 through 12 months, Total 593,852,000cbsh_ContractualMaturitiesTimeDepositsSixMonthsThroughTwelveMonthsNet
Due in over 12 months, Total 483,886,000cbsh_ContractualMaturitiesTimeDepositsAfterTwelveMonthsNet
Total 2,122,218,000us-gaap_TimeDeposits
Minimum reserve requirement $ 59,800,000cbsh_FederalReserveBankReserveRequirement