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Loans and Allowance for Credit Losses - Credit impaired loans acquired during the period (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
quarter
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contractually required payments receivable at acquisition $ 0us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition $ 6,912us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition
Cash flows expected to be collected at acquisition 0us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition 2,681us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition
Fair value of acquired loans at acquisition 0us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue 2,576us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue
Loans acquired during the year 0us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodNotAccountedForUsingIncomeRecognitionModelAtAcquisition 1,324us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodNotAccountedForUsingIncomeRecognitionModelAtAcquisition
Loans at the end of the year 0us-gaap_AllCertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNotAccountedForUsingIncomeRecognitionModel 1,324us-gaap_AllCertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesNotAccountedForUsingIncomeRecognitionModel
Number of rolling quarters used in analysis 20cvcy_FinancingReceivableAllowanceForCreditLossesMethodologyChangeNumberOfRollingQuartersUsedInAnalysis  
Real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contractually required payments receivable at acquisition $ 0us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember
$ 6,912us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_RealEstateMember