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Fair Value Measurements (Schedule Of Level 2 Financial Assets And Liabilities Measured On A Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Fair Value Measurement On Nonrecurring Basis Asset And Liabilities Value [Roll Forward] |  |
Beginning balance | $ 6,517 chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValue | $ 11,714 chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValue
Loans classified as impaired during the period | 2,859 chco_CarryingValueOfImpairedLoansBeforeAllocations | 0 chco_CarryingValueOfImpairedLoansBeforeAllocations
Specific valuation allowance allocations | (1,105)chco_AllowanceForLoanLossesOnImpairedLoansDuringPeriod | 0 chco_AllowanceForLoanLossesOnImpairedLoansDuringPeriod
Fair Value | 1,754 chco_AssetsAndLiabilitiesMeasuredOnNonrecurringBasis | 0 chco_AssetsAndLiabilitiesMeasuredOnNonrecurringBasis
(Additional) reduction in specific valuation allowance allocations | 14 chco_AdditionalReductionInSpecificValuationAllowanceAllocationsDuringPeriod | 369 chco_AdditionalReductionInSpecificValuationAllowanceAllocationsDuringPeriod
Paydowns, payoffs, other activity | 66 chco_AssetsAndLiabilitiesPaydownsPayoffsAndOtherActivity | 894 chco_AssetsAndLiabilitiesPaydownsPayoffsAndOtherActivity
Ending balance | $ 8,219 chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValue | $ 11,189 chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValue

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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 Activity + References No definition available. + Details
Name: | chco_AssetsAndLiabilitiesPaydownsPayoffsAndOtherActivity
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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