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Consolidated Financial Statements - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 Dwellings
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Amount payable to lessors	$ 209,673civb_AmountPayableToLessorsInRespectOfDefaultOnRentalObligation
Amount payable to lessors in percentage	21.30%civb_PercentageOfAmountPayableToLessors
Amount payable to owners	$ 139,814civb_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	2civb_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	1us-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

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- Definition

Amount payable to lessors in respect of default on rental obligation.

+ References

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- Definition

Amount payable to owners in respect of default on rental obligation.

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- Definition

Number of concentration by bank to lessors and owners of residential buildings and dwellings.

+ References

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Percentage of amount payable to owners.

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