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Allowance for Loan Losses - Impaired Financing Receivables - Average Recorded Investment and Interest Income Recognized (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total | $ 11,033 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment | $ 18,668 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Impaired financing receivables, Interest Income Recognized, Total | 146 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod | 304 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Commercial and Agriculture [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total | 2,303 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialAndAgricultureMember | 4,310 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialAndAgricultureMember
Impaired financing receivables, Interest Income Recognized, Total | 34 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialAndAgricultureMember | 65 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialAndAgricultureMember
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total | 3,752 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateOwnerOccupiedMember | 7,512 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateOwnerOccupiedMember
Impaired financing receivables, Interest Income Recognized, Total | 63 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateOwnerOccupiedMember | 126 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateOwnerOccupiedMember
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total | 2,123 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateNonOwnerOccupiedMember | 3,057 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateNonOwnerOccupiedMember
Impaired financing receivables, Interest Income Recognized, Total | 9 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateNonOwnerOccupiedMember | 21 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateNonOwnerOccupiedMember
Residential Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total | 2,830 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 3,782 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Impaired financing receivables, Interest Income Recognized, Total | 40 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 92 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Real Estate Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total | 20 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_RealEstateConstructionMember |
Consumer and Other [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired financing receivables, Average Recorded Investment, Total | $ 5 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_ConsumerAndOtherMember | $ 7 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_ConsumerAndOtherMember

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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