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Short-Term Debt (Summary Of Short-Term Borrowings) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Short-term Debt [Abstract] |  |  |
Short-term borrowings | $ 134,931 chco_CustomerRepurchaseAgreements | $ 137,798 chco_CustomerRepurchaseAgreements | $ 114,646 chco_CustomerRepurchaseAgreements
Customer repurchase agreements, avg outstanding | 133,769 chco_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearAverageBalanceOfAgreementsOutstanding | 127,616 chco_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearAverageBalanceOfAgreementsOutstanding | 121,270 chco_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearAverageBalanceOfAgreementsOutstanding
Federal Funds purchased, avg outstanding |  | 63 chco_FederalFundsPurchasedActivityForYearAverageBalanceOfAgreementsOutstanding | 510 chco_FederalFundsPurchasedActivityForYearAverageBalanceOfAgreementsOutstanding
Customer repurchase agreements, Max. outstanding at any month end | $ 151,637 chco_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearMaximumOutstandingAtAnyMonthEnd | $ 150,943 chco_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearMaximumOutstandingAtAnyMonthEnd | $ 131,971 chco_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearMaximumOutstandingAtAnyMonthEnd
Customer repurchase agreements, Weighted-averaged interest rate, During the year | 0.26%chco_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearAverageInterestRateForYear | 0.25%chco_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearAverageInterestRateForYear | 0.26%chco_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearAverageInterestRateForYear
Federal Funds purchased, Weighted-averaged interest rate, During the year |  | 0.31%chco_FederalFundsPurchasedActivityForYearAverageInterestRateForYear | 0.28%chco_FederalFundsPurchasedActivityForYearAverageInterestRateForYear
Customer repurchase agreements, Weighted-average interest rate, End of the year | 0.26%chco_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearAverageInterestRateAtPeriodEnd | 0.25%chco_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearAverageInterestRateAtPeriodEnd | 0.26%chco_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearAverageInterestRateAtPeriodEnd
Federal Funds purchased, Weighted-average interest rate, End of the year |  | 0.31%chco_FederalFundsPurchasedActivityForYearAverageInterestRateAtPeriodEnd | 0.28%chco_FederalFundsPurchasedActivityForYearAverageInterestRateAtPeriodEnd

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- Definition Customer repurchase agreements + References No definition available. + Details
Name: | chco_CustomerRepurchaseAgreements
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Federal Funds Purchased Activity For Year Average Balance Of Agreements Outstanding + References No definition available. + Details
Name: | chco_FederalFundsPurchasedActivityForYearAverageBalanceOfAgreementsOutstanding
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Federal Funds Purchased Activity For Year Average Interest Rate At Period End + References No definition available. + Details
Name: | chco_FederalFundsPurchasedActivityForYearAverageInterestRateAtPeriodEnd
Namespace Prefix: | chco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Federal Funds Purchased Activity For Year Average Interest Rate For Year + References No definition available. + Details
Name: | chco_FederalFundsPurchasedActivityForYearAverageInterestRateForYear
Namespace Prefix: | chco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Securities Sold Under Agreements To Repurchase Activity For Year Average Balance Of Agreements Outstanding + References No definition available. + Details
Name: | chco_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearAverageBalanceOfAgreementsOutstanding
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Securities Sold Under Agreements To Repurchase Activity For Year Average Interest Rate At Period End + References No definition available. + Details
Name: | chco_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearAverageInterestRateAtPeriodEnd
Namespace Prefix: | chco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Securities Sold Under Agreements To Repurchase Activity For Year Average Interest Rate For Year + References No definition available. + Details
Name: | chco_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearAverageInterestRateForYear
Namespace Prefix: | chco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Securities Sold Under Agreements To Repurchase Activity For Year Maximum Outstanding At Any Month End + References No definition available. + Details
Name: | chco_SecuritiesSoldUnderAgreementsToRepurchaseActivityForYearMaximumOutstandingAtAnyMonthEnd
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_ShortTermBorrowingsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration