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Investments (Credit Loss Component Of OTTI On Debt Securities Recognized In Earnings) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |
Beginning Balance | $ 22,770 chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings | $ 25,884 chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings
Additions: |  |
Initial credit impairment | 0 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsInitialCreditImpairment | 0 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsInitialCreditImpairment
Additional credit impairment | 0 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionalCreditImpairment | 0 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionalCreditImpairment
Deductions: |  |
Sold | 0 chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCalled | (3,114)chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCalled
Ending Balance | 22,770 chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings | 22,770 chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings
Debt Securities [Member] |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |
Beginning Balance | 21,186 chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 21,186 chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember
Additions: |  |
Initial credit impairment | 0 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsInitialCreditImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 0 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsInitialCreditImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember
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_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCalled / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 0 chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCalled / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember
Ending Balance | 21,186 chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 21,186 chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember
Equity Securities [Member] |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] |  |
Beginning Balance | 1,584 chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 4,698 chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Additions: |  |
Initial credit impairment | 0 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsInitialCreditImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 0 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsInitialCreditImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Additional credit impairment | 0 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionalCreditImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 0 chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionalCreditImpairment / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Deductions: |  |
Sold | 0 chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCalled / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | (3,114)chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCalled / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Ending Balance | $ 1,584 chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | $ 1,584 chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember

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