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Merger - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 0 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 06, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 05, 2015
Business Combinations [Line Items] |  |  |  |
Goodwill |  | $ 26,841 us-gaap_Goodwill | $ 21,720 us-gaap_Goodwill |
TCNB Financial Corp [Member] |  |  |  |
Business Combinations [Line Items] |  |  |  |
Cash paid for acquisition | 17,226 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember |  |  |
Acquisition value per share | $ 23.50 us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember |  |  |
Total assets of TCNB prior to the merger |  |  |  | 97,479 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember
Asset, loan | 76,830 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember |  |  | 76,771 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember
Assets, Deposit |  |  |  | 86,708 civb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDepositLiabilities / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember
Goodwill | 5,121 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember |  |  | 5,121 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember
Cash and short-term investments acquired | $ 18,152 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = civb_TcnbFinancialCorpMember |  |  |
Minimum [Member] |  |  |  |
Business Combinations [Line Items] |  |  |  |
Core deposit intangibles and other intangibles , amortization period | 5 years |  |  |
Maximum [Member] |  |  |  |
Business Combinations [Line Items] |  |  |  |
Core deposit intangibles and other intangibles , amortization period | 10 years |  |  |

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