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Previously Securitized Loans (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 transaction | Dec. 31, 2013 transaction | Dec. 31, 2012 transaction
Previously Securitized Loans [Abstract] |  |  |
Number of securitization transactions | 6 chco_NumberOfLoansSecuritizationTransactionsJuniorLienUnderlyingMortgages | 6 chco_NumberOfLoansSecuritizationTransactionsJuniorLienUnderlyingMortgages | 6 chco_NumberOfLoansSecuritizationTransactionsJuniorLienUnderlyingMortgages
Proceeds from securitization transactions | $ 760,000,000 chco_ProceedsFromSecuritizationOfMortgages | $ 760,000,000 chco_ProceedsFromSecuritizationOfMortgages | $ 760,000,000 chco_ProceedsFromSecuritizationOfMortgages
Fixed rate of junior-lien underlying mortgages | 125.00%chco_CollateralizationPercentageOfMortgagesUnderlyingSecuritizationTransaction | 125.00%chco_CollateralizationPercentageOfMortgagesUnderlyingSecuritizationTransaction | 125.00%chco_CollateralizationPercentageOfMortgagesUnderlyingSecuritizationTransaction
Outstanding balance of securitized loans | 4,900,000 chco_ContractualValueOutstandingLoansSecuritized | 6,200,000 chco_ContractualValueOutstandingLoansSecuritized |
Recognized interest income from previously securitized loans | 2,200,000 chco_RecognizedInterestIncomeFromPreviouslySecuritizedLoans | 2,500,000 chco_RecognizedInterestIncomeFromPreviouslySecuritizedLoans | 3,300,000 chco_RecognizedInterestIncomeFromPreviouslySecuritizedLoans
Carrying Value Outstanding on Loans Securitized | $ 0 chco_CarryingValueOutstandingonLoansSecuritized |  |

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- Definition CarryingValueOutstandingonLoansSecuritized + References No definition available. + Details
Name: | chco_CarryingValueOutstandingonLoansSecuritized
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Collateralization Percentage Of Mortgages Underlying Securitization Transaction + References No definition available. + Details
Name: | chco_CollateralizationPercentageOfMortgagesUnderlyingSecuritizationTransaction
Namespace Prefix: | chco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition ContractualValueOutstandingLoansSecuritized + References No definition available. + Details
Name: | chco_ContractualValueOutstandingLoansSecuritized
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number Of Loans Securitization Transactions Junior Lien Underlying Mortgages + References No definition available. + Details
Name: | chco_NumberOfLoansSecuritizationTransactionsJuniorLienUnderlyingMortgages
Namespace Prefix: | chco_
Data Type: | xbrli:positiveIntegerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | chco_PreviouslySecuritizedLoansAbstract
Namespace Prefix: | chco_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Proceeds From Securitization Of Mortgages + References No definition available. + Details
Name: | chco_ProceedsFromSecuritizationOfMortgages
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Recognized interest income from previously securitized loans. + References No definition available. + Details
Name: | chco_RecognizedInterestIncomeFromPreviouslySecuritizedLoans
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration