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Derivatives - Summary Of Gross Notional Amount Derivatives (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Customers [Member]
Derivative, Notional Amount	$ 242,782	$ 244,818
Financial Institutions [Member]
Derivative, Notional Amount	$ 242,782	$ 244,818

X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	srt_CounterpartyNameAxis=civb_CustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=civb_FinancialInstitutionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: