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Allowance for Loan Losses - Summary of Nonaccrual Loans (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | $ 13,582 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus | $ 13,558 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Commercial and Agriculture [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | 1,274 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialAndAgricultureMember | 1,264 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialAndAgricultureMember
Commercial Real Estate Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | 4,507 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateOwnerOccupiedMember | 3,403 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateOwnerOccupiedMember
Commercial Real Estate Non Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | 1,994 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateNonOwnerOccupiedMember | 2,134 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateNonOwnerOccupiedMember
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | 5,735 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember | 6,674 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | 32 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_RealEstateConstructionMember | 41 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_RealEstateConstructionMember
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total, Non-Accrual Status | $ 40 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_ConsumerAndOtherMember | $ 42 us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_ConsumerAndOtherMember

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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524 + Details
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