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Commitments, Contingencies and Off-Balance Sheet Risk - Contractual Amounts of Financial Instruments with Off-Balance-Sheet Risk (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fixed Rate | $ 8,215 | $ 9,621
Variable Rate | 222,247 | 218,604
Lines of Credit and Construction Loans [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fixed Rate | 7,610 | 9,416
Variable Rate | 194,874 | 195,732
Overdraft Protection [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fixed Rate | 5 | 5
Variable Rate | 27,053 | 22,122
Letters of Credit [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Fixed Rate | 600 | 200
Variable Rate | $ 320 | $ 750

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- Definition Concentration risk credit risk financial instruments off balance sheet risk asset at fixed rate. + References No definition available. + Details
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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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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: |