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Accumulated Other Comprehensive Loss (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Combined Federal and State income tax rate (percent)	23.00%	23.00%	23.00%	23.00%

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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:	num:percentItemType
Balance Type:	na
Period Type:	duration