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Short-Term Borrowings - Additional Information (Detail) | Dec. 31, 2023
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Short-Term Debt [Abstract] |
Average maturity days | 1 day

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- Definition Short term borrowings maturity date. + References No definition available. + Details
Name: | civb_ShortTermBorrowingsMaturityDate
Namespace Prefix: | civb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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