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v3.22.2.2

Allowance for Loan Losses - Performing and Nonperforming Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Performing | $ 423,036 | $ 378,785
Nonperforming | 326 |
Total | 423,362 | 378,785
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing | 383,389 | 347,847
Nonperforming | 326 |
Total | 383,715 | 347,847
Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing | 30,670 | 20,713
Total | 30,670 | 20,713
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing | 8,977 | 10,225
Total | $ 8,977 | $ 10,225

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
Name: | us-gaap_FinancingReceivableRecordedInvestmentLineItems
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: |