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Fair Value Measurement - Quantitative Information about Level 3 Fair Value Measurements (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value | $ 0 | $ 0
Assets Measured at Fair Value on a Nonrecurring Basis [Member] | (Level 3) [Member] | Impaired Loans [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value | $ 1 | $ 1,803
Valuation Technique [Extensible List] | civb:AppraisalOfCollateralMember | civb:AppraisalOfCollateralMember
Assets Measured at Fair Value on a Nonrecurring Basis [Member] | (Level 3) [Member] | Impaired Loans [Member] | Measurement Input, Appraised Value [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Unobservable Input | 30 |
Assets Measured at Fair Value on a Nonrecurring Basis [Member] | (Level 3) [Member] | Impaired Loans [Member] | Measurement Input, Appraised Value [Member] | Weighted Average [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Unobservable Input | 30 | 26
Assets Measured at Fair Value on a Nonrecurring Basis [Member] | (Level 3) [Member] | Impaired Loans [Member] | Measurement Input, Appraised Value [Member] | Minimum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Unobservable Input |  | 0
Assets Measured at Fair Value on a Nonrecurring Basis [Member] | (Level 3) [Member] | Impaired Loans [Member] | Measurement Input, Appraised Value [Member] | Maximum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Unobservable Input |  | 30
Assets Measured at Fair Value on a Nonrecurring Basis [Member] | (Level 3) [Member] | Impaired Loans [Member] | Measurement Input Holding Period [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Term | 22 months |
Assets Measured at Fair Value on a Nonrecurring Basis [Member] | (Level 3) [Member] | Impaired Loans [Member] | Measurement Input Holding Period [Member] | Weighted Average [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Term | 22 months | 21 months
Assets Measured at Fair Value on a Nonrecurring Basis [Member] | (Level 3) [Member] | Impaired Loans [Member] | Measurement Input Holding Period [Member] | Minimum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Term |  | 0 months
Assets Measured at Fair Value on a Nonrecurring Basis [Member] | (Level 3) [Member] | Impaired Loans [Member] | Measurement Input Holding Period [Member] | Maximum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Term |  | 30 months
Assets Measured at Fair Value on a Nonrecurring Basis [Member] | (Level 3) [Member] | Impaired Loans [Member] | Measurement Input Liquidation Expense [Member] | Weighted Average [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Unobservable Input |  | 8
Assets Measured at Fair Value on a Nonrecurring Basis [Member] | (Level 3) [Member] | Impaired Loans [Member] | Measurement Input Liquidation Expense [Member] | Minimum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Unobservable Input |  | 0
Assets Measured at Fair Value on a Nonrecurring Basis [Member] | (Level 3) [Member] | Impaired Loans [Member] | Measurement Input Liquidation Expense [Member] | Maximum [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Unobservable Input |  | 10

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