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Allowance for Loan Losses - Performing and Nonperforming Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Performing | $ 180,921 | $ 173,309
Nonperforming | 0 | 0
Total | 180,921 | 173,309
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing | 163,051 | 158,169
Nonperforming | 0 | 0
Total | 163,051 | 158,169
Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing | 8,466 | 5,808
Nonperforming | 0 | 0
Total | 8,466 | 5,808
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing | 9,404 | 9,332
Nonperforming | 0 | 0
Total | $ 9,404 | $ 9,332

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

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- Definition Performing and nonperforming loans. + References No definition available. + Details
Name: | civb_PerformingAndNonperformingLoans
Namespace Prefix: | civb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- 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
Name: | us-gaap_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=civb_RealEstateConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=civb_ConsumerAndOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |