XML 138 R88.htm IDEA: XBRL DOCUMENT v2.4.1.9
Short-Term Debt (Narrative) (Details) (USD $)
In Billions, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Investment Securities And One To Four Family Residential Property Loans    
Short-term Debt [Line Items]    
Collateral pledged to the FHLB $ 1.7us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
/ us-gaap_ShortTermDebtTypeAxis
= chco_InvestmentSecuritiesAndOneToFourFamilyResidentialPropertyLoansMember		 $ 1.7us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1
/ us-gaap_ShortTermDebtTypeAxis
= chco_InvestmentSecuritiesAndOneToFourFamilyResidentialPropertyLoansMember
City National    
Short-term Debt [Line Items]    
FHLB stock held 17,571chco_FederalHomeLoanBankStockHeld
/ dei_LegalEntityAxis
= chco_CityNationalMember		  
Unused FHLB funds $ 1.5us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds
/ dei_LegalEntityAxis
= chco_CityNationalMember		 $ 1.4us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds
/ dei_LegalEntityAxis
= chco_CityNationalMember