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Recent Accounting Pronouncements (Narrative) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)
Impact of ASC 326 Adoption	$ (2,335)
Receivables Acquired with Deteriorated Credit Quality [Domain]
Impact of ASC 326 Adoption	$ 2,700

X

- Definition

New Accounting Pronouncement, Effect Of Adoption, Quantification

+ References

No definition available.

+ Details

Name:	chco_NewAccountingPronouncementEffectOfAdoptionQuantification
Namespace Prefix:	chco_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Details

Name:	us-gaap_CreditLossStatusAxis=us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: