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Short-Term Borrowings - Additional Information (Detail)	Dec. 31, 2023
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