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Fair Value Measurement - Quantitative Information about Level 3 Fair Value Measurements (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 | Dec. 31, 2014
Impaired Loans [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Estimate | 10,061 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = civb_ImpairedLoansMember | 10,126 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = civb_ImpairedLoansMember
Impaired Loans [Member] | Appraisal of Collateral [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Measurements, Valuation Technique | Appraisal of collateral | Appraisal of collateral
Impaired Loans [Member] | Discounted Cash Flows [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Measurements, Valuation Technique | Discounted cash flows | Discounted cash flows
Other Real Estate Owned [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Estimate | 528 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = civb_OtherRealEstateOwnedMember | 560 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = civb_OtherRealEstateOwnedMember
Other Real Estate Owned [Member] | Appraisal of Collateral [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Measurements, Valuation Technique | Appraisal of collateral | Appraisal of collateral
Maximum [Member] | Impaired Loans [Member] | Appraisal of Collateral [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Appraisal adjustments | 30.00%civb_FairValueInputsAppraisalAdjustments / us-gaap_FairValueByAssetClassAxis = civb_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = civb_AppraisalOfCollateralMember | 30.00%civb_FairValueInputsAppraisalAdjustments / us-gaap_FairValueByAssetClassAxis = civb_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = civb_AppraisalOfCollateralMember
Fair Value Assumptions, Liquidation expense | 10.00%civb_FairValueInputsLiquidationExpense / us-gaap_FairValueByAssetClassAxis = civb_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = civb_AppraisalOfCollateralMember | 10.00%civb_FairValueInputsLiquidationExpense / us-gaap_FairValueByAssetClassAxis = civb_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = civb_AppraisalOfCollateralMember
Fair Value Assumptions, Holding period | 30 months | 30 months
Maximum [Member] | Impaired Loans [Member] | Discounted Cash Flows [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Discount rates | 8.00%civb_FairValueInputsChangeInInterestRates / us-gaap_FairValueByAssetClassAxis = civb_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = civb_DiscountedCashFlowMember | 8.00%civb_FairValueInputsChangeInInterestRates / us-gaap_FairValueByAssetClassAxis = civb_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = civb_DiscountedCashFlowMember
Maximum [Member] | Other Real Estate Owned [Member] | Appraisal of Collateral [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Appraisal adjustments | 30.00%civb_FairValueInputsAppraisalAdjustments / us-gaap_FairValueByAssetClassAxis = civb_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = civb_AppraisalOfCollateralMember | 30.00%civb_FairValueInputsAppraisalAdjustments / us-gaap_FairValueByAssetClassAxis = civb_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = civb_AppraisalOfCollateralMember
Fair Value Assumptions, Liquidation expense | 10.00%civb_FairValueInputsLiquidationExpense / us-gaap_FairValueByAssetClassAxis = civb_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = civb_AppraisalOfCollateralMember | 10.00%civb_FairValueInputsLiquidationExpense / us-gaap_FairValueByAssetClassAxis = civb_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ValuationTechniqueAxis = civb_AppraisalOfCollateralMember
Minimum [Member] | Impaired Loans [Member] | Appraisal of Collateral [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Appraisal adjustments | 10.00%civb_FairValueInputsAppraisalAdjustments / us-gaap_FairValueByAssetClassAxis = civb_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = civb_AppraisalOfCollateralMember | 10.00%civb_FairValueInputsAppraisalAdjustments / us-gaap_FairValueByAssetClassAxis = civb_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = civb_AppraisalOfCollateralMember
Fair Value Assumptions, Liquidation expense | 0.00%civb_FairValueInputsLiquidationExpense / us-gaap_FairValueByAssetClassAxis = civb_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = civb_AppraisalOfCollateralMember | 0.00%civb_FairValueInputsLiquidationExpense / us-gaap_FairValueByAssetClassAxis = civb_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = civb_AppraisalOfCollateralMember
Fair Value Assumptions, Holding period | 0 months | 0 months
Minimum [Member] | Impaired Loans [Member] | Discounted Cash Flows [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Discount rates | 3.80%civb_FairValueInputsChangeInInterestRates / us-gaap_FairValueByAssetClassAxis = civb_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = civb_DiscountedCashFlowMember | 3.80%civb_FairValueInputsChangeInInterestRates / us-gaap_FairValueByAssetClassAxis = civb_ImpairedLoansMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = civb_DiscountedCashFlowMember
Minimum [Member] | Other Real Estate Owned [Member] | Appraisal of Collateral [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Fair Value Assumptions, Appraisal adjustments | 10.00%civb_FairValueInputsAppraisalAdjustments / us-gaap_FairValueByAssetClassAxis = civb_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = civb_AppraisalOfCollateralMember | 10.00%civb_FairValueInputsAppraisalAdjustments / us-gaap_FairValueByAssetClassAxis = civb_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = civb_AppraisalOfCollateralMember
Fair Value Assumptions, Liquidation expense | 0.00%civb_FairValueInputsLiquidationExpense / us-gaap_FairValueByAssetClassAxis = civb_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = civb_AppraisalOfCollateralMember | 0.00%civb_FairValueInputsLiquidationExpense / us-gaap_FairValueByAssetClassAxis = civb_OtherRealEstateOwnedMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ValuationTechniqueAxis = civb_AppraisalOfCollateralMember

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- Definition Percentage of adjustment to the observed price for a similar asset, used as an input to measure fair value. + References No definition available. + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References No definition available. + Details
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X
- Definition Fair value inputs holding period. + References No definition available. + Details
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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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X
- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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