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Fair Value Measurements (Schedule Of Level 2 Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Fair Value Measurement On Nonrecurring Basis Asset And Liabilities Value [Roll Forward] |  |
Beginning balance | $ 8,482 | $ 6,517
Loans classified as impaired during the period | 0 | 2,859
Specific valuation allowance allocations | 0 | (1,105)
Fair Value | 0 | 1,754
(Additional) reduction in specific valuation allowance allocations | 0 | 14
Paydowns, payoffs, other activity | (1,247) | (66)
Ending balance | $ 7,235 | $ 8,219

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- Definition (Additional) Reduction In Specific Valuation Allowance Allocations During Period + References No definition available. + Details
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Balance Type: | credit
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- Definition Allowance For Loan Losses On Impaired Loans During The Period + References No definition available. + Details
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Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Assets And Liabilities Measured On Nonrecurring Basis + References No definition available. + Details
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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
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Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Carrying Value Of Impaired Loans Before Allocations + References No definition available. + Details
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Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Fair Value Measurement On Nonrecurring Basis Asset And Liabilities Value + References No definition available. + Details
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Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Fair Value Measurement On Nonrecurring Basis Asset And Liabilities Value [Roll Forward] + References No definition available. + Details
Name: | chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValueRollForward
Namespace Prefix: | chco_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration