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Securities - Available for Sale Securities (Parenthetical) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]
Accrued interest securities receivable	$ 3,755	$ 4,351

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- Definition

Marketable securities accrued interest receivable.

+ References

No definition available.

+ Details

Name:	civb_MarketableSecuritiesAccruedInterestReceivable
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_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration