Financing Receivable, Collateral Dependent

No definition available.

Name:	chco_FinancingReceivableCollateralDependent
Namespace Prefix:	chco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

+ Details

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

- Definition

Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5258-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524

+ Details

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

- Definition

Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, for which there is no related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953550-111524

+ Details

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

- Definition

Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.

+ References

+ Details

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

- Definition

Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5258-111524

+ Details

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

- Definition

Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

+ Details

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

- Definition

Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

+ References

+ Details

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

- Details

Name:	us-gaap_CollateralAxis=chco_RealEstateCollateralMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember
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Data Type:	na
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- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=chco_CommercialRealEstate14FamilyMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_CollateralAxis=chco_EquipmentAndReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=chco_CommercialRealEstateHotelsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=chco_CommercialRealEstateNonResidentialOwnerOccupiedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Allowance For Credit Losses (Schedule Of Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Recorded investment				$ 4,047
With no related allowance recorded, Unpaid principal balance				4,073
With an allowance recorded, Recorded investment				2,644
With an allowance recorded, Unpaid principal balance				2,644
With an allowance recorded, Related allowance				87
With no related allowance recorded, Average recorded investment	$ 4,043	$ 5,128
With no related allowance recorded, Interest income recognized	3	41
With an allowance recorded, Average recorded investment	5,748	4,800
With an allowance recorded, Interest income recognized	30	136
Real Estate
Financing Receivable, Impaired [Line Items]
Financing Receivable, Collateral Dependent			$ 5,485
Commercial and industrial
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Recorded investment				501
With no related allowance recorded, Unpaid principal balance				501
With an allowance recorded, Recorded investment				0
With an allowance recorded, Unpaid principal balance				0
With an allowance recorded, Related allowance				0
With no related allowance recorded, Average recorded investment	503	570
With no related allowance recorded, Interest income recognized	0	0
With an allowance recorded, Average recorded investment	100	0
With an allowance recorded, Interest income recognized	0	0
Commercial and industrial \| Real Estate
Financing Receivable, Impaired [Line Items]
Financing Receivable, Collateral Dependent			216
Commercial real estate
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, Recorded investment				3,546
With no related allowance recorded, Unpaid principal balance				3,572
With an allowance recorded, Recorded investment				2,644
With an allowance recorded, Unpaid principal balance				2,644
With an allowance recorded, Related allowance				$ 87
With no related allowance recorded, Average recorded investment	3,540	4,558
With no related allowance recorded, Interest income recognized	3	41
With an allowance recorded, Average recorded investment	5,648	4,800
With an allowance recorded, Interest income recognized	$ 30	$ 136
Commercial real estate \| Real Estate
Financing Receivable, Impaired [Line Items]
Financing Receivable, Collateral Dependent			5,269
1-4 Family \| Real Estate
Financing Receivable, Impaired [Line Items]
Financing Receivable, Collateral Dependent			0
1-4 Family \| Equipment
Financing Receivable, Impaired [Line Items]
Financing Receivable, Collateral Dependent			0
Hotels \| Real Estate
Financing Receivable, Impaired [Line Items]
Financing Receivable, Collateral Dependent			2,729
Non Residential Owner Occupied \| Real Estate
Financing Receivable, Impaired [Line Items]
Financing Receivable, Collateral Dependent			$ 2,540