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Allowance for Loan Losses - Performing and Nonperforming Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Performing	$ 219,522	$ 201,018
Nonperforming	16	9
Total	219,538	201,027
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing	198,237	179,721
Total	198,237	179,721
Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing	5,944	5,572
Total	5,944	5,572
Consumer and Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Performing	15,341	15,725
Nonperforming	16	9
Total	$ 15,357	$ 15,734

X

- Definition

Financing arrangement that represents a contractual right to receive money either on demand or on fixed or determinable dates that are not current in regards to payments.

+ References

No definition available.

+ Details

Name:	civb_NonPerformingLoans
Namespace Prefix:	civb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Performing and nonperforming loans.

+ References

No definition available.

+ Details

Name:	civb_PerformingAndNonperformingLoans
Namespace Prefix:	civb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Financing arrangement that represents a contractual right to receive money either on demand or on fixed or determinable dates that are current in regards to payments.

+ References

No definition available.

+ Details

Name:	civb_PerformingLoans
Namespace Prefix:	civb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=civb_RealEstateConstructionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=civb_ConsumerAndOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: