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Fair Value Measurement - Quantitative Information about Level 3 Fair Value Measurements (Detail) - Assets Measured at Fair Value on a Nonrecurring Basis [Member] - (Level 3) [Member] $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Impaired Loans [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value | $ 1,803 | $ 1,040
Valuation Technique [Extensible List] | civb:AppraisalOfCollateralMember | civb:AppraisalOfCollateralMember
Impaired Loans [Member] | Minimum [Member] | Measurement Input, Appraised Value |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Unobservable Input | 0 | 10
Impaired Loans [Member] | Minimum [Member] | Measurement Input Liquidation Expense [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Unobservable Input | 0 | 0
Impaired Loans [Member] | Minimum [Member] | Measurement Input Holding Period |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Term | 0 months | 0 months
Impaired Loans [Member] | Maximum [Member] | Measurement Input, Appraised Value |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Unobservable Input | 30 | 30
Impaired Loans [Member] | Maximum [Member] | Measurement Input Liquidation Expense [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Unobservable Input | 10 | 10
Impaired Loans [Member] | Maximum [Member] | Measurement Input Holding Period |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Term | 30 months | 30 months
Impaired Loans [Member] | Weighted Average [Member] | Measurement Input, Appraised Value |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Unobservable Input | 26 | 16
Impaired Loans [Member] | Weighted Average [Member] | Measurement Input Liquidation Expense [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Unobservable Input | 8 | 8
Impaired Loans [Member] | Weighted Average [Member] | Measurement Input Holding Period |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Impaired loans, Term | 21 months | 20 months
Other Real Estate Owned [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value |  | $ 16
Other Real Estate Owned, Valuation Technique [Extensible List] |  | civb:AppraisalOfCollateralMember
Other Real Estate Owned [Member] | Minimum [Member] | Measurement Input, Appraised Value |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Other real estate owned, Unobservable Input |  | 10
Other Real Estate Owned [Member] | Minimum [Member] | Measurement Input Liquidation Expense [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Other real estate owned, Unobservable Input |  | 0
Other Real Estate Owned [Member] | Maximum [Member] | Measurement Input, Appraised Value |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Other real estate owned, Unobservable Input |  | 30
Other Real Estate Owned [Member] | Maximum [Member] | Measurement Input Liquidation Expense [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Other real estate owned, Unobservable Input |  | 10
Other Real Estate Owned [Member] | Weighted Average [Member] | Measurement Input, Appraised Value |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Other real estate owned, Unobservable Input |  | 10
Other Real Estate Owned [Member] | Weighted Average [Member] | Measurement Input Liquidation Expense [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Other real estate owned, Unobservable Input |  | 10

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- 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
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- Definition Value of input used to measure real estate owned by financial institution by financial institution which is not directly related to its business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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