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Investments (Credit Loss Component Of OTTI On Debt Securities Recognized In Earnings) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |
Beginning Balance | $ 25,884 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarnings | $ 25,999 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarnings
Additions: |  |
Additional credit impairment | 0 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionalCreditImpairment | 0 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionalCreditImpairment
Deductions: |  |
Sold | (3,114)chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSold | (115)chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSold
Ending Balance | 22,770 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarnings | 25,884 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarnings
Debt Securities |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |
Beginning Balance | 21,186 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarnings / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 21,186 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarnings / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember
Additions: |  |
Additional credit impairment | 0 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionalCreditImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 0 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionalCreditImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember
Deductions: |  |
Sold | 0 chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSold / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 0 chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSold / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember
Ending Balance | 21,186 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarnings / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 21,186 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarnings / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember
Equity Securities |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |
Beginning Balance | 4,698 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarnings / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 4,813 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarnings / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Additions: |  |
Additional credit impairment | 0 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionalCreditImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 0 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionalCreditImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Deductions: |  |
Sold | (3,114)chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSold / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | (115)chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsSold / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Ending Balance | $ 1,584 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarnings / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | $ 4,698 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarnings / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember

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