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Long-Term Debt (Components Of Long-Term Debt) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Dec. 31, 2017
Long-term Debt, Unclassified [Abstract] |  |
Long-term debt | $ 16,495 | $ 16,495
Junior subordinated debentures, interest rate | 5.84% | 5.09%
Junior subordinated debentures, due date | Jun. 30, 2038 | Jun. 30, 2038
Percent over three month LIBOR Rate | 3.50% | 3.50%
Junior subordinated debenture, Threshold in days | 90 days | 90 days

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- Definition Distributions On Debentures Interest Rate Over Three Month Libor Rate + References No definition available. + Details
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Namespace Prefix: | chco_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Subordinated Borrowing Threshold In Days After Redemption Date For Redemption In Part + References No definition available. + Details
Name: | chco_SubordinatedBorrowingThresholdInDaysAfterRedemptionDateForRedemptionInPart
Namespace Prefix: | chco_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LongTermDebtAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Date the payments are due on subordinated debt, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_SubordinatedBorrowingDueDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Stated interest rate of the subordinated debt. + References No definition available. + Details
Name: | us-gaap_SubordinatedBorrowingInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration