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Capital Requirements and Restriction on Retained Earnings - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($)
Capital Requirements And Restriction On Retained Earnings [Abstract] |
Net profits available to pay dividends to CBI | $ 50,821

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- Definition Capital requirements and restriction on retained earnings. + References No definition available. + Details
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Namespace Prefix: | civb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount after tax of income (loss) of subsidiary attributable to the parent entity. + References No definition available. + Details
Name: | us-gaap_IncomeLossFromSubsidiariesNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration