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Fair Value Measurements Schedule of Level 3 Financial Assets and Liabilities Measured on A Recurring Basis (Details) (Level 3 [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Level 3 [Member] |  |
Fair Value Measurement On Nonrecurring Basis Asset And Liabilities Value [Roll Forward] |  |
Beginning balance | $ 10,679 | $ 13,500
Loans classified as impaired during the period | 3,030 | 0
Specific valuation allowance allocations | (750) | 0
Fair Value | 2,280 | 0
(Additional) reduction in specific valuation allowance allocations | (130) | 2,666
Paydowns, payoffs, other activity | (1,115) | (5,487)
Ending balance | $ 11,714 | $ 10,679

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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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Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
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- Definition Assets And Liabilities Measured On Nonrecurring Basis + References No definition available. + Details
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Namespace Prefix: | chco_
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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_
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- Definition Carrying Value Of Impaired Loans Before Allocations + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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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_
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- Details
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