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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
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Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fixed Rate | $ 10,635 civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate | $ 9,609 civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate
Variable Rate | 201,909 civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate | 183,847 civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate
Lines of Credit and Construction Loans [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fixed Rate | 10,430 civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate / us-gaap_CreditFacilityAxis = civb_LinesOfCreditAndConstructionLoansMember | 9,405 civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate / us-gaap_CreditFacilityAxis = civb_LinesOfCreditAndConstructionLoansMember
Variable Rate | 176,371 civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate / us-gaap_CreditFacilityAxis = civb_LinesOfCreditAndConstructionLoansMember | 160,718 civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate / us-gaap_CreditFacilityAxis = civb_LinesOfCreditAndConstructionLoansMember
Overdraft Protection [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fixed Rate | 5 civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate / us-gaap_CreditFacilityAxis = civb_OverdraftProtectionMember | 4 civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate / us-gaap_CreditFacilityAxis = civb_OverdraftProtectionMember
Variable Rate | 24,531 civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate / us-gaap_CreditFacilityAxis = civb_OverdraftProtectionMember | 22,122 civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate / us-gaap_CreditFacilityAxis = civb_OverdraftProtectionMember
Letters of Credit [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fixed Rate | 200 civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember | 200 civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtFixedRate / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember
Variable Rate | $ 1,007 civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember | $ 1,007 civb_ConcentrationRiskCreditRiskFinancialInstrumentsOffBalanceSheetRiskAssetAtVariableRate / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember

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- 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

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- 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

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

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

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

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