XML 204 R120.htm IDEA: XBRL DOCUMENT
v3.19.1

Fair Value Measurements Schedule of Level 3 Financial Assets and Liabilities Measured on A Recurring Basis (Details) - Level 3 - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Fair Value Measurement On Nonrecurring Basis Asset And Liabilities Value [Roll Forward] |  |
Beginning balance | $ 9,020 | $ 6,916
Loans classified as impaired during the period | 2,330 | 3,098
Specific valuation allowance allocations | 0 | (94)
Fair Value | 2,330 | 3,004
(Additional) reduction in specific valuation allowance allocations | (218) | (19)
Paydowns, payoffs, other activity | (1,054) | (881)
Ending balance | $ 10,078 | $ 9,020

X
- Definition (Additional) Reduction In Specific Valuation Allowance Allocations During Period + References No definition available. + Details
Name: | chco_AdditionalReductionInSpecificValuationAllowanceAllocationsDuringPeriod
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Allowance For Loan Losses On Impaired Loans During The Period + References No definition available. + Details
Name: | chco_AllowanceForLoanLossesOnImpairedLoansDuringPeriod
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Assets And Liabilities Measured On Nonrecurring Basis + References No definition available. + Details
Name: | chco_AssetsAndLiabilitiesMeasuredOnNonrecurringBasis
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Assets And Liabilities Paydowns, Payoffs and Other + References No definition available. + Details
Name: | chco_AssetsAndLiabilitiesPaydownsPayoffsandOther
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Carrying Value Of Impaired Loans Before Allocations + References No definition available. + Details
Name: | chco_CarryingValueOfImpairedLoansBeforeAllocations
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair Value Measurement On Nonrecurring Basis Asset And Liabilities Value + References No definition available. + Details
Name: | chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValue
Namespace Prefix: | chco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair Value Measurement On Nonrecurring Basis Asset And Liabilities Value [Roll Forward] + References No definition available. + Details
Name: | chco_FairValueMeasurementOnNonrecurringBasisAssetAndLiabilitiesValueRollForward
Namespace Prefix: | chco_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |