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Allowance for Loan Losses - Performing and Nonperforming Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Performing	$ 175,015civb_PerformingLoans	$ 173,309civb_PerformingLoans
Nonperforming	0civb_NonPerformingLoans	0civb_NonPerformingLoans
Total	175,015civb_PerformingAndNonperformingLoans	173,309civb_PerformingAndNonperformingLoans
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing	159,714civb_PerformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	158,169civb_PerformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Nonperforming	0civb_NonPerformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	0civb_NonPerformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Total	159,714civb_PerformingAndNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	158,169civb_PerformingAndNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing	6,043civb_PerformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_RealEstateConstructionMember	5,808civb_PerformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_RealEstateConstructionMember
Nonperforming	0civb_NonPerformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_RealEstateConstructionMember	0civb_NonPerformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_RealEstateConstructionMember
Total	6,043civb_PerformingAndNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_RealEstateConstructionMember	5,808civb_PerformingAndNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_RealEstateConstructionMember
Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing	9,258civb_PerformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_ConsumerAndOtherMember	9,332civb_PerformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_ConsumerAndOtherMember
Nonperforming	0civb_NonPerformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_ConsumerAndOtherMember	0civb_NonPerformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_ConsumerAndOtherMember
Total	$ 9,258civb_PerformingAndNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_ConsumerAndOtherMember	$ 9,332civb_PerformingAndNonperformingLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_ConsumerAndOtherMember

X

- Definition

Financing arrangement that represents a contractual right to receive money either on demand or on fixed or determinable dates that are not current in regards to payments.

+ References

No definition available.

+ Details

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Namespace Prefix:	civb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Performing and nonperforming loans.

+ References

No definition available.

+ Details

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X

- Definition

Financing arrangement that represents a contractual right to receive money either on demand or on fixed or determinable dates that are current in regards to payments.

+ References

No definition available.

+ Details

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X

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