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Commitments And Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Standby letters of credit    
Commitments And Contingencies [Line Items]    
Contractual obligations $ 4,592us-gaap_CommitmentsAndContingencies
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_StandbyLettersOfCreditMember
$ 14,122us-gaap_CommitmentsAndContingencies
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_StandbyLettersOfCreditMember
Commercial letters of credit    
Commitments And Contingencies [Line Items]    
Contractual obligations 1,991us-gaap_CommitmentsAndContingencies
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= chco_CommercialLettersOfCreditMember
1,555us-gaap_CommitmentsAndContingencies
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= chco_CommercialLettersOfCreditMember
Home equity - junior liens (including lines of credit) | Commitments to extend credit:    
Commitments And Contingencies [Line Items]    
Contractual obligations 175,312us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
174,417us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityMember
Commercial Real Estate | Commitments to extend credit:    
Commitments And Contingencies [Line Items]    
Contractual obligations 50,298us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
42,209us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateMember
Other commitments | Commitments to extend credit:    
Commitments And Contingencies [Line Items]    
Contractual obligations $ 145,283us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= chco_OtherCommitmentsMember
$ 201,065us-gaap_CommitmentsAndContingencies
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= chco_OtherCommitmentsMember