Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses

No definition available.

Name:	chco_FinancingReceivableTroubledDebtRestructuringAllowanceForCreditLosses
Namespace Prefix:	chco_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Financing Receivables, Impaired, Troubled Debt Restructuring, Provision for Credit Losses

+ References

No definition available.

+ Details

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

- 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

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

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

+ Details

Name:	us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Reflects the amount of the write-down related to a troubled debt restructuring.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

+ Details

Name:	us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of financing receivable modified on trial basis.

+ References

+ Details

Name:	us-gaap_LoanRestructuringTrialModificationsAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of unfunded portion of contractual agreement to lend funds to borrower for financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18794-111554

+ Details

Name:	us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis=us-gaap_ConsumerBorrowerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationNameAxis=chco_COVID19Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_PaymentDeferralMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis=us-gaap_CommercialBorrowerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=chco_CommercialRealEstate14FamilyDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=chco_CommercialRealEstateHotelsDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=chco_CommercialRealEstateMultifamilyDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=chco_CommercialRealEstateNonResidentialNonOwnerOccupiedDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=chco_CommercialRealEstateNonResidentialOwnerOccupiedDomain
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_HomeEquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Allowance For Credit Losses (Financing Receivable, Troubled Debt Restructurings) (Details) $ in Thousands	2 Months Ended	3 Months Ended		12 Months Ended
	May 06, 2020 USD ($)	Mar. 31, 2020 USD ($) contract	Mar. 31, 2019 USD ($) contract	Dec. 31, 2019 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring		$ 29,054		$ 29,630
Number of Contracts \| contract		11	28
Pre-Modification Outstanding Recorded Investment		$ 877	$ 1,798
Post Modification Outstanding Recorded Investment		875	1,798
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend		0
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down		100	100	700
Financing Receivable, Troubled Debt Restructuring, Allowance for Credit Losses		700		800
Financing Receivables, Impaired, Troubled Debt Restructuring, Provision for Credit Losses		100	$ 100
Financing Receivable, Troubled Debt Restructuring, Subsequent Default				$ 3,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts \| contract				1
Consumer Borrower [Member] \| COVID-19 [Member] \| Payment Deferral [Member] \| Subsequent Event [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loan Restructuring, Trial Modifications, Amount	$ 99,000
Commercial Borrower [Member] \| COVID-19 [Member] \| Payment Deferral [Member] \| Subsequent Event [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loan Restructuring, Trial Modifications, Amount	$ 391,300
Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring		$ 0		$ 0
Number of Contracts \| contract		0	0
Pre-Modification Outstanding Recorded Investment		$ 0	$ 0
Post Modification Outstanding Recorded Investment		0	$ 0
Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring		$ 5,163		4,973
Number of Contracts \| contract		0	0
Pre-Modification Outstanding Recorded Investment		$ 0	$ 0
Post Modification Outstanding Recorded Investment		0	$ 0
1-4 Family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring		$ 128
Number of Contracts \| contract		0
Pre-Modification Outstanding Recorded Investment		$ 0
Post Modification Outstanding Recorded Investment		0
Hotels
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring		$ 2,861
Number of Contracts \| contract		0
Pre-Modification Outstanding Recorded Investment		$ 0
Post Modification Outstanding Recorded Investment		0
Multi-family
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring		$ 1,940
Number of Contracts \| contract		0
Pre-Modification Outstanding Recorded Investment		$ 0
Post Modification Outstanding Recorded Investment		0
Non Residential Non-Owner Occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring		$ 0
Number of Contracts \| contract		0
Pre-Modification Outstanding Recorded Investment		$ 0
Post Modification Outstanding Recorded Investment		0
Non Residential Owner Occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring		$ 234
Number of Contracts \| contract		0
Pre-Modification Outstanding Recorded Investment		$ 0
Post Modification Outstanding Recorded Investment		0
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring		$ 21,413		21,029
Number of Contracts \| contract		9	23
Pre-Modification Outstanding Recorded Investment		$ 807	$ 1,729
Post Modification Outstanding Recorded Investment		805	$ 1,729
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring		$ 2,294		3,628
Number of Contracts \| contract		2	5
Pre-Modification Outstanding Recorded Investment		$ 70	$ 69
Post Modification Outstanding Recorded Investment		70	$ 69
Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Troubled Debt Restructuring		$ 184		$ 0
Number of Contracts \| contract		0	0
Pre-Modification Outstanding Recorded Investment		$ 0	$ 0
Post Modification Outstanding Recorded Investment		$ 0	$ 0