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Acquisitions (Acquired Loans At Acquisition) (Details) - AFB $ in Thousands | Nov. 06, 2015 USD ($)
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Business Acquisition [Line Items] |
Outstanding balance | $ 119,242
Less: fair value adjustment | (1,763)
Fair value of acquired noncredit-impaired loans | $ 117,479

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- Definition Carry Value of Loans at Acquisition Date + References No definition available. + Details
Name: | chco_CarryValueofLoansatAcquisitionDate
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition FairValueAdjustment for NonCredit Impaired Loans Acquired + References No definition available. + Details
Name: | chco_FairValueAdjustmentforNonCreditImpairedLoansAcquired
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair Value of NonCredit Impaired Loans + References No definition available. + Details
Name: | chco_FairValueofNonCreditImpairedLoans
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=chco_AmericanFoundersBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |