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Stock-Based Compensation and Directors Stock Purchase Plan Stock-Based Compensation and Directors Stock Purchase Plan (Additional Information About Stock Options and SARs Exercises) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation [Abstract]      
Intrinsic value of options and SARs exercised $ 8,068cbsh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesAndStockAppreciationRightsExercisesInPeriodTotalIntrinsicValue $ 6,580cbsh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesAndStockAppreciationRightsExercisesInPeriodTotalIntrinsicValue $ 7,769cbsh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesAndStockAppreciationRightsExercisesInPeriodTotalIntrinsicValue
Cash received from options and SARs exercised 8,652cbsh_CashReceivedFromOptionsAndStockAppreciationRightsExercised 9,426cbsh_CashReceivedFromOptionsAndStockAppreciationRightsExercised 14,820cbsh_CashReceivedFromOptionsAndStockAppreciationRightsExercised
Tax benefit realized from options and SARs exercised $ 1,153cbsh_TaxBenefitRealizedFromOptionsAndStockAppreciationRightsExercised $ 335cbsh_TaxBenefitRealizedFromOptionsAndStockAppreciationRightsExercised $ 1,269cbsh_TaxBenefitRealizedFromOptionsAndStockAppreciationRightsExercised