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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] - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Impaired Loans [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Estimate | $ 1,350 | $ 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] |  |
Fair Value Assumptions, Appraisal adjustments | 10.00% | 0.00%
Impaired Loans [Member] | Minimum [Member] | Measurement Input Liquidation Expense |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Liquidation expense | 0.00% | 0.00%
Impaired Loans [Member] | Minimum [Member] | Measurement Input Holding Period |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Holding period | 0 months | 0 months
Impaired Loans [Member] | Maximum [Member] | Measurement Input, Appraised Value |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Appraisal adjustments | 38.00% | 30.00%
Impaired Loans [Member] | Maximum [Member] | Measurement Input Liquidation Expense |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Liquidation expense | 10.00% | 10.00%
Impaired Loans [Member] | Maximum [Member] | Measurement Input Holding Period |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Holding period | 30 months | 30 months
Impaired Loans [Member] | Weighted Average [Member] | Measurement Input, Appraised Value |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Appraisal adjustments | 30.00% | 16.00%
Impaired Loans [Member] | Weighted Average [Member] | Measurement Input Liquidation Expense |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Liquidation expense | 3.00% | 8.00%
Impaired Loans [Member] | Weighted Average [Member] | Measurement Input Holding Period |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Holding period | 21 months | 20 months
Other Real Estate Owned |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Estimate |  | $ 16
Other Real Estate Owned, Valuation Technique [Extensible List] |  | civb:AppraisalOfCollateralMember
Other Real Estate Owned | Minimum [Member] | Measurement Input, Appraised Value |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Appraisal adjustments |  | 10.00%
Other Real Estate Owned | Minimum [Member] | Measurement Input Liquidation Expense |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Liquidation expense |  | 0.00%
Other Real Estate Owned | Maximum [Member] | Measurement Input, Appraised Value |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Appraisal adjustments |  | 30.00%
Other Real Estate Owned | Maximum [Member] | Measurement Input Liquidation Expense |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Liquidation expense |  | 10.00%
Other Real Estate Owned | Weighted Average [Member] | Measurement Input, Appraised Value |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Appraisal adjustments |  | 10.00%
Other Real Estate Owned | Weighted Average [Member] | Measurement Input Liquidation Expense |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Liquidation expense |  | 10.00%

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- Definition Percentage of adjustment to the observed price to dispose of asset, used as an input to measure fair value. + References No definition available. + Details
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- Definition Indicates valuation technique for measuring alternative investment. + 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)(1) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14210-108612 + Details
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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 Indicates valuation technique for measuring real estate owned 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)(1) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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