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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
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Dec. 31, 2014 | Dec. 31, 2013
Level 3 |  |
Fair Value Measurement On Nonrecurring Basis Asset And Liabilities Value [Roll Forward] |  |
Beginning balance | $ 11,714 chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ 10,679 chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Loans classified as impaired during the period | 0 chco_CarryingValueOfImpairedLoansBeforeAllocations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 3,030 chco_CarryingValueOfImpairedLoansBeforeAllocations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Specific valuation allowance allocations | 0 chco_AllowanceForLoanLossesOnImpairedLoansDuringPeriod / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | (750)chco_AllowanceForLoanLossesOnImpairedLoansDuringPeriod / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Fair Value | 0 chco_AssetsAndLiabilitiesMeasuredOnNonrecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 2,280 chco_AssetsAndLiabilitiesMeasuredOnNonrecurringBasis / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
(Additional) reduction in specific valuation allowance allocations | 628 chco_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 | $ 6,517 chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ 11,714 chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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- Definition Additional Reduction In Specific Valuation Allowance Allocations During Period + References No definition available. + Details
Name: | chco_AdditionalReductionInSpecificValuationAllowanceAllocationsDuringPeriod
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Allowance For Loan Losses On Impaired Loans During The Period + References No definition available. + Details
Name: | chco_AllowanceForLoanLossesOnImpairedLoansDuringPeriod
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Assets And Liabilities Measured On Nonrecurring Basis + References No definition available. + Details
Name: | chco_AssetsAndLiabilitiesMeasuredOnNonrecurringBasis
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Assets And Liabilities Paydowns, Payoffs and Other + References No definition available. + Details
Name: | chco_AssetsAndLiabilitiesPaydownsPayoffsandOther
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Carrying Value Of Impaired Loans Before Allocations + References No definition available. + Details
Name: | chco_CarryingValueOfImpairedLoansBeforeAllocations
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Fair Value Measurement On Nonrecurring Basis Asset And Liabilities Value + References No definition available. + Details
Name: | chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValue
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValueRollForward
Namespace Prefix: | chco_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration