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v3.25.1

Accumulated Other Comprehensive Loss (Narrative) (Details) | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Equity [Abstract] |  |
Combined Federal and State income tax rate (percent) | 23.00% | 23.00%

X
- 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

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