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Derivative Instruments Derivative Instruments (Derivative Liabilities Offset in the Consolidated Balance Sheet) (Details) (Interest Rate Swap, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Interest Rate Swap
 
Offsetting Liabilities [Line Items]  
Gross Amounts of Recognized Liabilities $ 10,253us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Net Amounts of Liabilities presented in the Statement of Financial Position 10,253us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Fair Value of Financial Collateral 13,264us-gaap_DerivativeLiabilityFairValueOfCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Total of Gross Amounts Not Offset in the Statement of Financial Position Including Applicable Netting Agreement and Fair Value of Collateral 13,264us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Net Amount $ 0chco_DerivativeLiabilitiesNetAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember