Provision For Loan Losses on Impaired Loans During Period

No definition available.

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Namespace Prefix:	chco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Unobservable Inputs Fair Value Measurement Collateral Discount Percent

+ References

No definition available.

+ Details

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

- Definition

Amount of credit risk valuation adjustment to derivative assets to properly reflect the credit quality of the counterparties.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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- Definition

Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

+ Details

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Period Type:	duration

- Details

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Namespace Prefix:
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Balance Type:
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- Details

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Fair Value Measurements (Narrative) (Details) - USD ($)	6 Months Ended		12 Months Ended
Fair Value Measurements (Narrative) (Details) - USD ($)	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Material losses related to counterparty's inability to pay undercollateralized position	$ 0
Significant change in the value of derivative assets and liabilities attributed to credit risk	0
Loans individually evaluated
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
ProvisionForLoanLossesonImpairedLoansDuringPeriod	$ (478,000)		$ (1,118,000)
Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateral discount	10.00%	10.00%
Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateral discount	30.00%	30.00%