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Capital Requirements and Restriction on Retained Earnings - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020 USD ($)
Capital Requirements And Restriction On Retained Earnings [Abstract]
Net profits available to pay dividends to CBI	$ 53,484,000

X

- Definition

Capital requirements and restriction on retained earnings.

+ References

No definition available.

+ Details

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Namespace Prefix:	civb_
Data Type:	xbrli:stringItemType
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- Definition

Amount after tax of income (loss) of subsidiary attributable to the parent entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration