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Income Taxes (Reconciliation Of The Significant Differences Between The Federal Statutory Income Tax Rate And Effective Income Tax Rate) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Computed federal taxes at statutory rate |  |  |  |  |  |  |  |  | $ 27,031 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 25,722 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 20,735 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal tax benefit |  |  |  |  |  |  |  |  | (482)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 1,982 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 1,591 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Tax-exempt interest income |  |  |  |  |  |  |  |  | (500)us-gaap_IncomeTaxReconciliationTaxExemptIncome | (616)us-gaap_IncomeTaxReconciliationTaxExemptIncome | (712)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Bank-owned life insurance |  |  |  |  |  |  |  |  | (1,074)chco_IncomeTaxReconciliationBankOwnedLifeInsuranceTaxEffect | (1,187)chco_IncomeTaxReconciliationBankOwnedLifeInsuranceTaxEffect | (1,044)chco_IncomeTaxReconciliationBankOwnedLifeInsuranceTaxEffect
Tax reserve adjustment |  |  |  |  |  |  |  |  | 0 chco_IncomeTaxReconciliationTaxReserveAdjustment | 24 chco_IncomeTaxReconciliationTaxReserveAdjustment | 8 chco_IncomeTaxReconciliationTaxReserveAdjustment
Other items, net |  |  |  |  |  |  |  |  | (704)us-gaap_IncomeTaxReconciliationOtherReconcilingItems | (650)us-gaap_IncomeTaxReconciliationOtherReconcilingItems | (280)us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Income tax expense | $ 5,961 us-gaap_IncomeTaxExpenseBenefit | $ 6,010 us-gaap_IncomeTaxExpenseBenefit | $ 6,497 us-gaap_IncomeTaxExpenseBenefit | $ 5,803 us-gaap_IncomeTaxExpenseBenefit | $ 6,877 us-gaap_IncomeTaxExpenseBenefit | $ 7,056 us-gaap_IncomeTaxExpenseBenefit | $ 6,573 us-gaap_IncomeTaxExpenseBenefit | $ 4,769 us-gaap_IncomeTaxExpenseBenefit | $ 24,271 us-gaap_IncomeTaxExpenseBenefit | $ 25,275 us-gaap_IncomeTaxExpenseBenefit | $ 20,298 us-gaap_IncomeTaxExpenseBenefit

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- Definition Income Tax Reconciliation Bank Owned Life Insurance Tax Effect + References No definition available. + Details
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- Definition Income Tax Reconciliation Tax Reserve Adjustment + References No definition available. + Details
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- Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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