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Investments - Textual (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Schedule of Available-for-sale Securities      
Available-for-sale Securities Pledged as Collateral $ 109,341,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral    
Available-for-sale Securities, Gross Unrealized Gain (Loss) 10,554,000us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 8,896,000us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1  
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to realized net gains on available-for-sale securities 299,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax 110,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax  
Transfer of securities from available-for-sale to held-to-maturity 0cvcy_AvailableforsaleSecuritiesTransferstoHeldtomaturity 31,346,000cvcy_AvailableforsaleSecuritiesTransferstoHeldtomaturity 31,346,000cvcy_AvailableforsaleSecuritiesTransferstoHeldtomaturity
Fair value of held-to-maturity investment securities transferred     32,047,000cvcy_AvailableforsaleSecuritiesTransferstoHeldtomaturityFairValue
Unrealized gain on transfer of securities from available-for-sale to held-to-maturity 0cvcy_AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesUnrealizedGainLoss 163,000cvcy_AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesUnrealizedGainLoss 163,000cvcy_AvailableforsaleSecuritiesTransferredtoHeldtomaturitySecuritiesUnrealizedGainLoss
AOCI available-for-sale securities adjustment tax 4,343,000cvcy_AccumulatedOtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentTax   3,661,000cvcy_AccumulatedOtherComprehensiveIncomeAvailableForSaleSecuritiesAdjustmentTax
Unaccreted balance 141,000cvcy_AccumulatedOtherComprehensiveIncomeLossAvailableforSaleSecuritiesTransferredtoHeldtoMaturityUnaccretedBalance   142,000cvcy_AccumulatedOtherComprehensiveIncomeLossAvailableforSaleSecuritiesTransferredtoHeldtoMaturityUnaccretedBalance
U.S. Government agencies      
Schedule of Available-for-sale Securities      
Available-for-sale Securities, Number of Positions 14cvcy_AvailableForSaleSecuritiesNumberOfPositions
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
   
Debt Securities, Amortized Cost 50,661,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
  33,088,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Obligations of states and political subdivisions      
Schedule of Available-for-sale Securities      
Available-for-sale Securities, Number of Positions 151cvcy_AvailableForSaleSecuritiesNumberOfPositions
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
   
Debt Securities, Amortized Cost 145,696,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
  143,343,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
U.S. Government agencies collateralized by residential mortgage obligations      
Schedule of Available-for-sale Securities      
Available-for-sale Securities, Number of Positions 182cvcy_AvailableForSaleSecuritiesNumberOfPositions
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
   
Debt Securities, Amortized Cost 210,617,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
  236,629,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Private label residential mortgage backed securities      
Schedule of Available-for-sale Securities      
Available-for-sale Securities, Gross Unrealized Gain (Loss) 1,693,000us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
   
Available-for-sale Securities, Number of Positions 20cvcy_AvailableForSaleSecuritiesNumberOfPositions
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
   
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions 0us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
   
Debt Securities, Amortized Cost 2,783,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
  3,079,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Other equity securities      
Schedule of Available-for-sale Securities      
Available For Sale Securities, Number of Securities 1cvcy_AvailableForSaleSecuritiesNumberofSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
   
Available-for-sale Equity Securities, Amortized Cost Basis 7,500,000us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
  7,500,000us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Less than 12 months | U.S. Government agencies      
Schedule of Available-for-sale Securities      
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions 6us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ cvcy_DurationOfLossAxis
= cvcy_LessThanTwelveMonthsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
   
Less than 12 months | Obligations of states and political subdivisions      
Schedule of Available-for-sale Securities      
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions 7us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ cvcy_DurationOfLossAxis
= cvcy_LessThanTwelveMonthsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
   
Less than 12 months | U.S. Government agencies collateralized by residential mortgage obligations      
Schedule of Available-for-sale Securities      
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions 24us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ cvcy_DurationOfLossAxis
= cvcy_LessThanTwelveMonthsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
   
Greater than 12 months | U.S. Government agencies      
Schedule of Available-for-sale Securities      
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions 0us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ cvcy_DurationOfLossAxis
= cvcy_GreaterThanTwelveMonthsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
   
Greater than 12 months | Obligations of states and political subdivisions      
Schedule of Available-for-sale Securities      
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions 4us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ cvcy_DurationOfLossAxis
= cvcy_GreaterThanTwelveMonthsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
   
Greater than 12 months | U.S. Government agencies collateralized by residential mortgage obligations      
Schedule of Available-for-sale Securities      
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions 10us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ cvcy_DurationOfLossAxis
= cvcy_GreaterThanTwelveMonthsMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
   
Below investment grade | Private label residential mortgage backed securities      
Schedule of Available-for-sale Securities      
Available-for-sale Securities, Number of Positions 10cvcy_AvailableForSaleSecuritiesNumberOfPositions
/ us-gaap_ExternalCreditRatingByGroupingAxis
= us-gaap_ExternalCreditRatingNonInvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
   
Debt Securities, Amortized Cost $ 2,346,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
/ us-gaap_ExternalCreditRatingByGroupingAxis
= us-gaap_ExternalCreditRatingNonInvestmentGradeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember