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Fair Value Measurements Schedule of Level 3 Financial Assets and Liabilities Measured on A Recurring Basis (Details) (Level 3, USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Level 3
    
Fair Value Measurement On Nonrecurring Basis Asset And Liabilities Value [Roll Forward]    
Beginning balance $ 11,714chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 $ 10,679chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Loans classified as impaired during the period 0chco_CarryingValueOfImpairedLoansBeforeAllocations
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 3,030chco_CarryingValueOfImpairedLoansBeforeAllocations
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Specific valuation allowance allocations 0chco_AllowanceForLoanLossesOnImpairedLoansDuringPeriod
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 (750)chco_AllowanceForLoanLossesOnImpairedLoansDuringPeriod
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Fair Value 0chco_AssetsAndLiabilitiesMeasuredOnNonrecurringBasis
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 2,280chco_AssetsAndLiabilitiesMeasuredOnNonrecurringBasis
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
(Additional) reduction in specific valuation allowance allocations 628chco_AdditionalReductionInSpecificValuationAllowanceAllocationsDuringPeriod
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 (130)chco_AdditionalReductionInSpecificValuationAllowanceAllocationsDuringPeriod
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Paydowns, payoffs, other activity (5,825)chco_AssetsAndLiabilitiesPaydownsPayoffsandOther
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 (1,115)chco_AssetsAndLiabilitiesPaydownsPayoffsandOther
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Ending balance $ 6,517chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 $ 11,714chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member