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Merger - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 06, 2015
Dec. 31, 2014
Mar. 05, 2015
Net assets acquired:        
Goodwill $ 26,841us-gaap_Goodwill   $ 21,720us-gaap_Goodwill  
Cash acquired in acquisition 926us-gaap_CashAcquiredFromAcquisition      
TCNB Financial Corp [Member]        
Business Acquisition [Line Items]        
Total purchase price   17,226us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
   
Net assets acquired:        
Cash and short-term investments   18,152us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
   
Loans, net   76,830us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
  76,771us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancialAssets
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
Other securities   716us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
   
Premises and equipment   1,739us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
   
Accrued interest receivable   194us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
   
Goodwill   5,121us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
  5,121us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
Core deposit intangible   1,009us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
   
Other assets   1,265us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
   
Noninterest-bearing deposits   (18,263)civb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNonInterestBearingDeposits
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
   
Interest-bearing deposits   (68,606)civb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInterestBearingDeposits
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
   
Other liabilities   (5)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
   
Net assets acquired   18,152us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember
   
Cash acquired in acquisition   $ 926us-gaap_CashAcquiredFromAcquisition
/ us-gaap_BusinessAcquisitionAxis
= civb_TcnbFinancialCorpMember