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Allowance for Loan Losses - Changes in Allowance for Loan Losses (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Allowance for loan losses:
Beginning balance	$ 14,268us-gaap_AllowanceForDoubtfulAccountsReceivable	$ 16,528us-gaap_AllowanceForDoubtfulAccountsReceivable
Charge-offs	(585)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs	(652)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Recoveries	232us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries	141us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
Provision	400us-gaap_ProvisionForLoanAndLeaseLosses	750us-gaap_ProvisionForLoanAndLeaseLosses
Ending Balance	14,315us-gaap_AllowanceForDoubtfulAccountsReceivable	16,767us-gaap_AllowanceForDoubtfulAccountsReceivable
Commercial and Agriculture [Member]
Allowance for loan losses:
Beginning balance	1,822us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialAndAgricultureMember	2,841us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialAndAgricultureMember
Charge-offs		(229)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialAndAgricultureMember
Recoveries	19us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialAndAgricultureMember	58us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialAndAgricultureMember
Provision	(47)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialAndAgricultureMember	(63)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialAndAgricultureMember
Ending Balance	1,794us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialAndAgricultureMember	2,607us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialAndAgricultureMember
Commercial Real Estate Owner Occupied [Member]
Allowance for loan losses:
Beginning balance	2,580us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateOwnerOccupiedMember	3,263us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateOwnerOccupiedMember
Charge-offs	(198)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateOwnerOccupiedMember	(47)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateOwnerOccupiedMember
Recoveries	2us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateOwnerOccupiedMember	5us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateOwnerOccupiedMember
Provision	224us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateOwnerOccupiedMember	608us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateOwnerOccupiedMember
Ending Balance	2,608us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateOwnerOccupiedMember	3,829us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateOwnerOccupiedMember
Commercial Real Estate Non Owner Occupied [Member]
Allowance for loan losses:
Beginning balance	4,798us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateNonOwnerOccupiedMember	4,296us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateNonOwnerOccupiedMember
Charge-offs	(9)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateNonOwnerOccupiedMember	(27)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateNonOwnerOccupiedMember
Recoveries	65us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateNonOwnerOccupiedMember	12us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateNonOwnerOccupiedMember
Provision	72us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateNonOwnerOccupiedMember	(113)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateNonOwnerOccupiedMember
Ending Balance	4,926us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateNonOwnerOccupiedMember	4,168us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_CommercialRealEstateNonOwnerOccupiedMember
Residential Real Estate [Member]
Allowance for loan losses:
Beginning balance	3,747us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	5,224us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Charge-offs	(328)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	(317)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Recoveries	131us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	49us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Provision	116us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	94us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Ending Balance	3,666us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember	5,050us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialPortfolioSegmentMember
Real Estate Construction [Member]
Allowance for loan losses:
Beginning balance	428us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_RealEstateConstructionMember	184us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_RealEstateConstructionMember
Recoveries	1us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_RealEstateConstructionMember	1us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_RealEstateConstructionMember
Provision	69us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_RealEstateConstructionMember	110us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_RealEstateConstructionMember
Ending Balance	498us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_RealEstateConstructionMember	295us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_RealEstateConstructionMember
Consumer and Other [Member]
Allowance for loan losses:
Beginning balance	196us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_ConsumerAndOtherMember	214us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_ConsumerAndOtherMember
Charge-offs	(50)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_ConsumerAndOtherMember	(32)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_ConsumerAndOtherMember
Recoveries	14us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_ConsumerAndOtherMember	16us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_ConsumerAndOtherMember
Provision	26us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_ConsumerAndOtherMember	41us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_ConsumerAndOtherMember
Ending Balance	186us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_ConsumerAndOtherMember	239us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = civb_ConsumerAndOtherMember
Unallocated [Member]
Allowance for loan losses:
Beginning balance	697us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_UnallocatedFinancingReceivablesMember	506us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_UnallocatedFinancingReceivablesMember
Provision	(60)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_UnallocatedFinancingReceivablesMember	73us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_UnallocatedFinancingReceivablesMember
Ending Balance	$ 637us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_UnallocatedFinancingReceivablesMember	$ 579us-gaap_AllowanceForDoubtfulAccountsReceivable / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_UnallocatedFinancingReceivablesMember

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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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Amount of expense related to estimated loss from loan and lease transactions.

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