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Background and Basis Of Presentation Background and Basis of Presentation (Details) (City National [Member]) | Mar. 31, 2015 store
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Entity Location [Line Items] |
Number of Stores | 82 us-gaap_NumberOfStores
WEST VIRGINIA |
Entity Location [Line Items] |
Number of Stores | 57 us-gaap_NumberOfStores / dei_LegalEntityAxis = chco_CityNationalMember / us-gaap_StatementGeographicalAxis = stpr_WV
VIRGINIA |
Entity Location [Line Items] |
Number of Stores | 14 us-gaap_NumberOfStores / dei_LegalEntityAxis = chco_CityNationalMember / us-gaap_StatementGeographicalAxis = stpr_VA
KENTUCKY |
Entity Location [Line Items] |
Number of Stores | 8 us-gaap_NumberOfStores / dei_LegalEntityAxis = chco_CityNationalMember / us-gaap_StatementGeographicalAxis = stpr_KY
OHIO |
Entity Location [Line Items] |
Number of Stores | 3 us-gaap_NumberOfStores / dei_LegalEntityAxis = chco_CityNationalMember / us-gaap_StatementGeographicalAxis = stpr_OH

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