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Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost $ 630us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Due after one year through five years, Amortized Cost 27,680us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Due after five years through ten years,Amortized Cost 34,948us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Due after ten years, Amortized Cost 64,903us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Mortgage-backed securities, Amortized Cost 64,512us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost  
Equity securities, Amortized Cost 481civb_AvailableForSaleSecuritiesEquityMaturitiesAmortizedCost  
Amortized Cost 193,154us-gaap_AvailableForSaleSecuritiesAmortizedCost 192,252us-gaap_AvailableForSaleSecuritiesAmortizedCost
Due in one year or less, Fair Value 631us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Due after one year through five years, Fair Value 27,900us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Due after five years through ten years, Fair Value 36,552us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Due after ten years, Fair Value 68,283us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Mortgage-backed securities, Fair Value 65,755us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue  
Equity securities, Fair Value 572civb_AvailableForSaleSecuritiesEquityMaturitiesFairValue  
Total securities available for sale, Fair Value $ 199,693us-gaap_AvailableForSaleSecurities $ 197,905us-gaap_AvailableForSaleSecurities