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Fair Value Measurements (Schedule Of Level 2 Financial Assets And Liabilities Measured On A Recurring Basis) (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014
Fair Value Measurement On Nonrecurring Basis Asset And Liabilities Value [Roll Forward] |  |
Beginning balance | $ 6,517 | $ 11,714
Loans classified as impaired during the period | 799 | 0
Specific valuation allowance allocations | 0 | 0
Fair Value | 799 | 0
(Additional) reduction in specific valuation allowance allocations | (22) | 633
Paydowns, payoffs, other activity | (172) | (5,730)
Ending balance | $ 7,122 | $ 6,617

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- Definition (Additional) Reduction In Specific Valuation Allowance Allocations During Period + References No definition available. + Details
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- Definition Allowance For Loan Losses On Impaired Loans During The Period + References No definition available. + Details
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- Definition Assets And Liabilities Measured On Nonrecurring Basis + References No definition available. + Details
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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
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- Definition Carrying Value Of Impaired Loans Before Allocations + References No definition available. + Details
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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
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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_
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