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Accumulated Other Comprehensive Income (Narrative) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Equity [Abstract]
Combined Federal and State income tax rate (percent)	24.00%	24.00%	24.00%	24.00%

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- Definition

Combined Federal And State Income Tax Rate

+ References

No definition available.

+ Details

Name:	chco_CombinedFederalAndStateIncomeTaxRate
Namespace Prefix:	chco_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_EquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration