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Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Interest Income
Interest and fees on loans	$ 29,388us-gaap_InterestAndFeeIncomeLoansAndLeases	$ 29,734us-gaap_InterestAndFeeIncomeLoansAndLeases
Interest and dividends on investment securities:
Taxable	2,712us-gaap_InterestIncomeSecuritiesTaxable	3,003us-gaap_InterestIncomeSecuritiesTaxable
Tax-exempt	264us-gaap_InterestIncomeSecuritiesTaxExempt	281us-gaap_InterestIncomeSecuritiesTaxExempt
Total Interest Income	32,364us-gaap_InterestAndDividendIncomeOperating	33,018us-gaap_InterestAndDividendIncomeOperating
Interest Expense
Interest on deposits	2,741us-gaap_InterestExpenseDeposits	2,753us-gaap_InterestExpenseDeposits
Interest on short-term borrowings	82us-gaap_InterestExpenseShortTermBorrowings	75us-gaap_InterestExpenseShortTermBorrowings
Interest on long-term debt	150us-gaap_InterestExpenseLongTermDebt	150us-gaap_InterestExpenseLongTermDebt
Total Interest Expense	2,973us-gaap_InterestExpense	2,978us-gaap_InterestExpense
Net Interest Income	29,391us-gaap_InterestIncomeExpenseNet	30,040us-gaap_InterestIncomeExpenseNet
Provision for loan losses	888us-gaap_ProvisionForLoanAndLeaseLosses	1,363us-gaap_ProvisionForLoanAndLeaseLosses
Net Interest Income After Provision for Loan Losses	28,503us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	28,677us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Non-interest Income
Gains on sale of investment securities	14us-gaap_GainLossOnSaleOfSecuritiesNet	83us-gaap_GainLossOnSaleOfSecuritiesNet
Service charges	5,927us-gaap_FeesAndCommissionsDepositorAccounts	6,160us-gaap_FeesAndCommissionsDepositorAccounts
Bankcard revenue	4,074us-gaap_FeesAndCommissionsCreditAndDebitCards	3,685us-gaap_FeesAndCommissionsCreditAndDebitCards
Insurance commissions	0us-gaap_InsuranceCommissionsAndFees	2,025us-gaap_InsuranceCommissionsAndFees
Trust and investment management fee income	1,200us-gaap_FeesAndCommissionsFiduciaryAndTrustActivities	1,037us-gaap_FeesAndCommissionsFiduciaryAndTrustActivities
Bank owned life insurance	764us-gaap_BankOwnedLifeInsuranceIncome	756us-gaap_BankOwnedLifeInsuranceIncome
Gain (Loss) on Disposition of Business	11,084us-gaap_GainLossOnSaleOfBusiness	0us-gaap_GainLossOnSaleOfBusiness
Other income	958us-gaap_NoninterestIncomeOther	559us-gaap_NoninterestIncomeOther
Total Non-interest Income	24,021us-gaap_NoninterestIncome	14,305us-gaap_NoninterestIncome
Non-interest Expense
Salaries and employee benefits	12,179us-gaap_LaborAndRelatedExpense	13,139us-gaap_LaborAndRelatedExpense
Occupancy and equipment	2,590us-gaap_OccupancyNet	2,615us-gaap_OccupancyNet
Depreciation	1,511us-gaap_Depreciation	1,478us-gaap_Depreciation
FDIC insurance expense	450us-gaap_FederalDepositInsuranceCorporationPremiumExpense	410us-gaap_FederalDepositInsuranceCorporationPremiumExpense
Advertising	704us-gaap_AdvertisingExpense	824us-gaap_AdvertisingExpense
Bankcard expenses	818chco_BankcardExpenses	806chco_BankcardExpenses
Postage, delivery, and statement mailings	561us-gaap_PostageExpense	575us-gaap_PostageExpense
Office supplies	346us-gaap_SuppliesExpense	410us-gaap_SuppliesExpense
Legal and professional fees	567us-gaap_ProfessionalFees	409us-gaap_ProfessionalFees
Telecommunications	475us-gaap_Communication	338us-gaap_Communication
Repossessed asset losses, net of expenses	220us-gaap_ForeclosedRealEstateExpense	379us-gaap_ForeclosedRealEstateExpense
Other expenses	2,744us-gaap_OtherNoninterestExpense	1,993us-gaap_OtherNoninterestExpense
Total Non-interest Expense	23,165us-gaap_NoninterestExpense	23,376us-gaap_NoninterestExpense
Income Before Income Taxes	29,359us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	19,606us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense	11,367us-gaap_IncomeTaxExpenseBenefit	5,803us-gaap_IncomeTaxExpenseBenefit
Net Income Available to Common Shareholders	17,992us-gaap_NetIncomeLoss	13,803us-gaap_NetIncomeLoss
Total comprehensive income	$ 18,898us-gaap_ComprehensiveIncomeNetOfTax	$ 14,579us-gaap_ComprehensiveIncomeNetOfTax
Average common shares outstanding (in shares)	15,067us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	15,631us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities, employee stock awards and warrants outstanding (in shares)	82chco_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsandWarrants	165chco_IncrementalCommonSharesAttributabletoDilutiveEffectofSharebasedPaymentArrangementsandWarrants
Effect of dilutive securities:
Shares for diluted earnings per share (in shares)	15,149us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	15,796us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per common share (in dollars per share)	$ 1.18us-gaap_EarningsPerShareBasic	$ 0.87us-gaap_EarningsPerShareBasic
Diluted earnings per common share (in dollars per share)	$ 1.17us-gaap_EarningsPerShareDiluted	$ 0.86us-gaap_EarningsPerShareDiluted
Dividends declared per common share (in dollars per share)	$ 0.42us-gaap_CommonStockDividendsPerShareDeclared	$ 0.4us-gaap_CommonStockDividendsPerShareDeclared

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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