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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   $ 26,841us-gaap_Goodwill $ 21,720us-gaap_Goodwill  
TCNB Financial Corp [Member]        
Business Combinations [Line Items]        
Cash paid for acquisition 17,226us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
     
Acquisition value per share $ 23.50us-gaap_BusinessAcquisitionSharePrice
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
     
Total assets of TCNB prior to the merger       97,479us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
Asset, loan 76,830us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
    76,771us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
Assets, Deposit       86,708civb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDepositLiabilities
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
Goodwill 5,121us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
    5,121us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
Cash and short-term investments acquired $ 18,152us-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