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Fair Value Measurement - Additional Information (Detail) $ in Thousands	Sep. 30, 2019 USD ($)
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