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Derivative Instruments Derivative Instruments (Derivative Assets Offset in The Consolidated Balance Sheet) (Details) (Interest Rate Swap, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Interest Rate Swap
 
Offsetting Assets [Line Items]  
Gross Amounts of Recognized Assets $ 10,253us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Net Amounts of Assets presented in the Statement of Financial Position 10,253us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Fair Value of Financial Collateral 10,253us-gaap_DerivativeAssetFairValueOfCollateral
/ 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 10,253us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Net Amount $ 0chco_DerivativeAssetsNetAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember