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Fair Value Measurement - Additional Information (Detail) $ in Thousands | Jun. 30, 2019 USD ($)
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Fair Value Disclosures [Abstract] |
Impaired loans, estimated selling cost | $ 13

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- Definition Refers to the estimated selling cost of impaired loans excluded from calculation of fair value. + References No definition available. + Details
Name: | civb_ImpairedLoansEstimatedSellingCost
Namespace Prefix: | civb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration