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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 $ 22,770chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings $ 25,884chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings
Additions:    
Initial credit impairment 0chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsInitialCreditImpairment 0chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsInitialCreditImpairment
Additional credit impairment 0chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionalCreditImpairment 0chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionalCreditImpairment
Deductions:    
Sold 0chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCalled (3,114)chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCalled
Ending Balance 22,770chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings 22,770chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings
Debt Securities [Member]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Beginning Balance 21,186chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
21,186chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Additions:    
Initial credit impairment 0chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsInitialCreditImpairment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
0chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsInitialCreditImpairment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Additional credit impairment 0chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionalCreditImpairment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
0chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionalCreditImpairment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Deductions:    
Sold 0chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCalled
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
0chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCalled
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Ending Balance 21,186chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
21,186chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
Equity Securities [Member]    
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Beginning Balance 1,584chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
4,698chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Additions:    
Initial credit impairment 0chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsInitialCreditImpairment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
0chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsInitialCreditImpairment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Additional credit impairment 0chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionalCreditImpairment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
0chco_OtherThatTemporaryImpairmentCreditLossesRecognizedInEarningsAdditionalCreditImpairment
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Deductions:    
Sold 0chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCalled
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
(3,114)chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsReductionsCalled
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Ending Balance $ 1,584chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
$ 1,584chco_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarnings
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember