XML 60 R48.htm IDEA: XBRL DOCUMENT
v3.20.2

Derivative Instruments (Fair Value Of Derivative Instruments) (Details) - Non-hedging interest rate derivatives: - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Customer Counterparties Loan Interest Rate Swap Assets | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 651,096 | $ 377,534
Fair Value | 62,404 | 16,094
Customer Counterparties Loan Interest Rate Swap Liabilities | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 4,272 | 189,803
Fair Value | 283 | 3,214
Financial Institution Counterparties Loan Interest Rate Swap Asset | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 4,272 | 189,803
Fair Value | 283 | 3,214
Financial Institution Counterparties Loan Interest Rate Swap Liabilities | Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 655,743 | 382,566
Fair Value | $ 62,602 | $ 16,133

X
- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- 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_DerivativesFairValueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=chco_CustomerCounterpartiesLoanInterestRateSwapAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=chco_CustomerCounterpartiesLoanInterestRateSwapLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=chco_FinancialInstitutionCounterpartiesLoanInterestRateSwapAssetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=chco_FinancialInstitutionCounterpartiesLoanInterestRateSwapLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |