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v3.20.1

Allowance for Loan Losses - Performing and Nonperforming Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Performing | $ 407,051 | $ 407,201
Total | 407,051 | 407,201
Residential Real Estate [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing | 382,720 | 378,999
Total | 382,720 | 378,999
Real Estate Construction [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing | 10,565 | 10,372
Total | 10,565 | 10,372
Consumer and Other [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Performing | 13,766 | 17,830
Total | $ 13,766 | $ 17,830

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- 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

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- 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

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- 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

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

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

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