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Commitments, Contingencies and Off-Balance-Sheet Risk - Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fixed Rate	$ 10,635civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate	$ 9,609civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate
Variable Rate	201,909civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate	183,847civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate
Lines of Credit and Construction Loans [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fixed Rate	10,430civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate / us-gaap_CreditFacilityAxis = civb_LinesOfCreditAndConstructionLoansMember	9,405civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate / us-gaap_CreditFacilityAxis = civb_LinesOfCreditAndConstructionLoansMember
Variable Rate	176,371civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate / us-gaap_CreditFacilityAxis = civb_LinesOfCreditAndConstructionLoansMember	160,718civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate / us-gaap_CreditFacilityAxis = civb_LinesOfCreditAndConstructionLoansMember
Overdraft Protection [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fixed Rate	5civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate / us-gaap_CreditFacilityAxis = civb_OverdraftProtectionMember	4civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate / us-gaap_CreditFacilityAxis = civb_OverdraftProtectionMember
Variable Rate	24,531civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate / us-gaap_CreditFacilityAxis = civb_OverdraftProtectionMember	22,122civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate / us-gaap_CreditFacilityAxis = civb_OverdraftProtectionMember
Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fixed Rate	200civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember	200civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember
Variable Rate	$ 1,007civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember	$ 1,007civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember

X

- Definition

Concentration risk credit risk financial instruments off balance sheet risk asset at fixed rate.

+ References

No definition available.

+ Details

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

X

- Definition

Concentration risk credit risk financial instruments off balance sheet risk asset at variable rate.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_CreditFacilityAxis=civb_LinesOfCreditAndConstructionLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=civb_OverdraftProtectionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: