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City Holding Company (Parent Company Only) Financial Information (Condensed Statements Of Comprehensive Income) (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
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment securities gains | $ 184 us-gaap_GainLossOnInvestments | $ 71 us-gaap_GainLossOnInvestments | $ 818 us-gaap_GainLossOnInvestments | $ 83 us-gaap_GainLossOnInvestments | $ 671 us-gaap_GainLossOnInvestments | $ 0 us-gaap_GainLossOnInvestments | $ 9 us-gaap_GainLossOnInvestments | $ 84 us-gaap_GainLossOnInvestments | $ 1,156 us-gaap_GainLossOnInvestments | $ 764 us-gaap_GainLossOnInvestments | $ 954 us-gaap_GainLossOnInvestments
Interest expense | 3,041 us-gaap_InterestExpense | 2,968 us-gaap_InterestExpense | 2,973 us-gaap_InterestExpense | 2,978 us-gaap_InterestExpense | 3,115 us-gaap_InterestExpense | 3,304 us-gaap_InterestExpense | 3,427 us-gaap_InterestExpense | 3,455 us-gaap_InterestExpense | 11,960 us-gaap_InterestExpense | 13,301 us-gaap_InterestExpense | 14,450 us-gaap_InterestExpense
Income Before Income Taxes |  |  |  |  |  |  |  |  | 77,233 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 73,490 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 59,243 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax (benefit) 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
Net Income Available to Common Shareholders | 14,530 us-gaap_NetIncomeLoss | 11,872 us-gaap_NetIncomeLoss | 12,757 us-gaap_NetIncomeLoss | 13,803 us-gaap_NetIncomeLoss | 13,247 us-gaap_NetIncomeLoss | 13,975 us-gaap_NetIncomeLoss | 13,006 us-gaap_NetIncomeLoss | 7,987 us-gaap_NetIncomeLoss | 52,962 us-gaap_NetIncomeLoss | 48,215 us-gaap_NetIncomeLoss | 38,945 us-gaap_NetIncomeLoss
Total comprehensive income |  |  |  |  |  |  |  |  | 53,793 us-gaap_ComprehensiveIncomeNetOfTax | 44,647 us-gaap_ComprehensiveIncomeNetOfTax | 41,430 us-gaap_ComprehensiveIncomeNetOfTax
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends from subsidiaries |  |  |  |  |  |  |  |  | 46,050 chco_DividendsReceivedFromSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 46,317 chco_DividendsReceivedFromSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 41,422 chco_DividendsReceivedFromSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investment securities gains |  |  |  |  |  |  |  |  | 1,130 us-gaap_GainLossOnInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 89 us-gaap_GainLossOnInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,134 us-gaap_GainLossOnInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other income |  |  |  |  |  |  |  |  | 65 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 66 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 65 us-gaap_OtherIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income |  |  |  |  |  |  |  |  | 47,245 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 46,472 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 42,621 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest expense |  |  |  |  |  |  |  |  | 605 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 617 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 661 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other expenses |  |  |  |  |  |  |  |  | 849 us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,352 us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 533 us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Expenses |  |  |  |  |  |  |  |  | 1,454 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,969 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,194 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income Before Income Taxes |  |  |  |  |  |  |  |  | 45,791 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 43,503 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 41,427 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax (benefit) expense |  |  |  |  |  |  |  |  | (231)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,050)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income Before Equity in Undistributed Net Income (Excess Dividends) of Subsidiaries |  |  |  |  |  |  |  |  | 46,022 chco_IncomeLossFromContinuingOperationsBeforeEquityInUndistributedNetIncomeOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 44,553 chco_IncomeLossFromContinuingOperationsBeforeEquityInUndistributedNetIncomeOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 41,425 chco_IncomeLossFromContinuingOperationsBeforeEquityInUndistributedNetIncomeOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in undistributed net income (excess dividends) of subsidiaries |  |  |  |  |  |  |  |  | 6,940 chco_EquityInUndistributedEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,662 chco_EquityInUndistributedEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2,480)chco_EquityInUndistributedEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net Income Available to Common Shareholders |  |  |  |  |  |  |  |  | 52,962 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 48,215 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 38,945 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total comprehensive income |  |  |  |  |  |  |  |  | $ 53,793 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 44,647 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 41,430 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=16317811 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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