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Consolidated Financial Statements - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 Dwellings
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |
Amount payable to lessors | $ 209,673 civb_AmountPayableToLessorsInRespectOfDefaultOnRentalObligation
Amount payable to lessors in percentage | 21.30%civb_PercentageOfAmountPayableToLessors
Amount payable to owners | $ 139,814 civb_AmountPayableToOwnersInRespectOfDefaultOnRentalObligation
Amount payable to owners in percentage | 14.20%civb_PercentageOfAmountPayableToOwners
Number of concentration by bank to lessors and owners of Residential Buildings and Dwellings | 2 civb_NumberOfConcentrationByBankToLessorsAndOwnersOfResidentialBuildingsAndDwellings
Maximum [Member] |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |
Percentage of insurance commission revenue of total revenue | 1.00%civb_PercentageOfInsuranceCommissionRevenueOfRevenue / us-gaap_RangeAxis = us-gaap_MaximumMember
Water St. [Member] |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |
Number of reportable segment | 1 us-gaap_NumberOfReportableSegments / dei_LegalEntityAxis = civb_WaterStMember
Water St. [Member] | Maximum [Member] |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |
Percentage of insurance commission revenue of total revenue | 1.00%civb_PercentageOfInsuranceCommissionRevenueOfRevenue / dei_LegalEntityAxis = civb_WaterStMember / us-gaap_RangeAxis = us-gaap_MaximumMember

X
- Definition Amount payable to lessors in respect of default on rental obligation. + References No definition available. + Details
Name: | civb_AmountPayableToLessorsInRespectOfDefaultOnRentalObligation
Namespace Prefix: | civb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount payable to owners in respect of default on rental obligation. + References No definition available. + Details
Name: | civb_AmountPayableToOwnersInRespectOfDefaultOnRentalObligation
Namespace Prefix: | civb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | civb_NatureOfOperationsAndSummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | civb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of concentration by bank to lessors and owners of residential buildings and dwellings. + References No definition available. + Details
Name: | civb_NumberOfConcentrationByBankToLessorsAndOwnersOfResidentialBuildingsAndDwellings
Namespace Prefix: | civb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of amount payable to lessors. + References No definition available. + Details
Name: | civb_PercentageOfAmountPayableToLessors
Namespace Prefix: | civb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of amount payable to owners. + References No definition available. + Details
Name: | civb_PercentageOfAmountPayableToOwners
Namespace Prefix: | civb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of insurance commission revenue of total revenue. + References No definition available. + Details
Name: | civb_PercentageOfInsuranceCommissionRevenueOfRevenue
Namespace Prefix: | civb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=civb_WaterStMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |