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Investments - Investments by contractual maturity (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities    
Within one year, amortized cost $ 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Within one year, estimated fair value 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
After one year through five years, amortized cost 3,510us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
After one year through five years, estimated fair value 3,853us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
After five years through ten years, amortized cost 20,110us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
After five years through ten years, estimated fair value 21,013us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
After ten years, amortized cost 122,076us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
After ten years, estimated fair value 127,585us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Total securities with single maturity date, amortized cost 145,696cvcy_AvailableForSaleSecuritiesDebtMaturitiesWithSingleMaturityDateAmortizedCostBasis  
Total securities with single maturity date, estimated fair value 152,451cvcy_AvailableForSaleSecuritiesDebtMaturitiesWithSingleMaturityDateFairValue  
Debt securities, amortized cost 417,257us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost  
Available-for-sale investment securities 427,811us-gaap_AvailableForSaleSecurities 432,535us-gaap_AvailableForSaleSecurities
Held-to-maturity Securities    
Ten Years, Amortized Cost 32,096us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount  
Ten Years, Estimated Fair Value 35,486us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue  
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 50,661us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		  
Investment securities not due at a single maturity date, estimated fair value 50,648us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		  
U.S. Government agencies collateralized by residential mortgage obligations    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 210,617us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		  
Investment securities not due at a single maturity date, estimated fair value 212,581us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember		  
Private label residential mortgage backed securities    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 2,783us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember		  
Investment securities not due at a single maturity date, estimated fair value 4,476us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember		  
Other equity securities    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 7,500us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember		  
Investment securities not due at a single maturity date, estimated fair value $ 7,655us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember