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Preferred Shares - Additional information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended
Dec. 19, 2013
Feb. 15, 2014
Mar. 31, 2015
Dec. 31, 2014
Depositary Shares [Member]        
Preferred Stock [Line Items]        
Newly issued shares 1,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= civb_DepositarySharesMember		      
Percentage of ownership Interest 2.50%civb_PercentageOfOwnershipInterest
/ us-gaap_StatementClassOfStockAxis
= civb_DepositarySharesMember		      
Share issued price per share $ 25.00civb_PublicOfferingPricePerShare
/ us-gaap_StatementClassOfStockAxis
= civb_DepositarySharesMember		      
Gross proceeds from public offering $ 25,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity
/ us-gaap_StatementClassOfStockAxis
= civb_DepositarySharesMember		      
Series B Preferred Stock [Member]        
Preferred Stock [Line Items]        
Preferred stock liquidation preference $ 1,000us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		   $ 1,000us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		 $ 1,000us-gaap_PreferredStockLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Dividend on preferred stock 6.50%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		      
Series A Preferred Stock [Member]        
Preferred Stock [Line Items]        
Aggregate purchase price of Preferred stock   $ 22,857us-gaap_StockRedeemedOrCalledDuringPeriodValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		    
Preferred stock redemption date   Feb. 15, 2014