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Long-Term Debt (Components Of Long-Term Debt) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Long-term Debt, Unclassified [Abstract]    
Long-term debt $ 16,495us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust $ 16,495us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
Junior subordinated debentures, interest rate 3.74%us-gaap_SubordinatedBorrowingInterestRate 3.74%us-gaap_SubordinatedBorrowingInterestRate
Junior subordinated debentures, due date Dec. 31, 2038 Dec. 31, 2038
Percent over three month LIBOR Rate 3.50%chco_DistributionsOnDebenturesInterestRateOverThreeMonthLiborRate 3.50%chco_DistributionsOnDebenturesInterestRateOverThreeMonthLiborRate
Junior subordinated debenture, Threshold in days 90 days 90 days