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v3.20.1

Accumulated Other Comprehensive Loss (Narrative) (Details) | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Combined Federal And State Income Tax Rate | 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