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Investment Securities - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Securities
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]      
Number of securities   13cvbf_NumberOfSecurities  
Investment securities, par value   $ 94,200,000cvbf_AvailableForSaleSecuritiesAmortizedCostSoldDuringPeriod  
Pre-tax gain on sale of securities 0us-gaap_GainLossOnSaleOfSecuritiesNet 2,094,000us-gaap_GainLossOnSaleOfSecuritiesNet 0us-gaap_GainLossOnSaleOfSecuritiesNet
Gains (loss) recognized 0us-gaap_RealizedInvestmentGainsLosses    
Average life of investment grade debt securities, years 4 years    
Gross unrealized holding losses 0us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss    
Book value of the bond 1,528,000us-gaap_HeldToMaturitySecurities 1,777,000us-gaap_HeldToMaturitySecurities  
Credit-related impairment loss on investment securities held-to-maturity 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentHeldtomaturitySecurities 0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentHeldtomaturitySecurities  
Investment securities pledged as collateral 3,110,000,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral 2,600,000,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral  
Investment in FHLB stock, impairment losses 0us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxAvailableforsaleDebtSecurities    
United States [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Securities issued by U.S. government percentage 81.00%cvbf_SecuritiesIssuedByGovernmentOrGovernmentSponsoredAgenciesAndEnterprisesPercentage
/ us-gaap_StatementGeographicalAxis
= country_US
   
Government agency [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Agency bond callable 223,200,000cvbf_CallableSecuritiesAtCarryingValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
   
CMO's / REMIC's - residential [Member]      
Schedule of Available-for-sale Securities [Line Items]      
CMO/REMICs backed by whole loans issued by private-label companies (non-government sponsored) 343,000cvbf_SecuritiesBackedByWholeLoans
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedMortgageObligationsMember
   
Investment security classified as held-to-maturity, number 1cvbf_InvestmentSecurityClassifiedAsHeldToMaturityNumber
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedMortgageObligationsMember
   
Held-to-Maturity securities, average FICO score 715cvbf_HeldToMaturityAssetsFicoScoreAverage
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedMortgageObligationsMember
   
Held-to-Maturity securities, acquired price, percentage 98.25%cvbf_HeldToMaturitySecuritiesAcquiredPricePercentage
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedMortgageObligationsMember
   
Average percentage of LTV 71.00%cvbf_AveragePercentageOfLtv
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedMortgageObligationsMember
   
Average life of investment grade debt securities, years 30 years    
Current fair value percentage of Held-to-Maturity security against par value 81.00%cvbf_FairValuePercentageOfHeldToMaturitySecurityAgainstParValue
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedMortgageObligationsMember
   
Investment contractual cash flows guaranteed by Government, percentage 99.98%cvbf_InvestmentContractualCashFlowsGuaranteedByGovernment
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedMortgageObligationsMember
   
Investment contractual cash flows guaranteed by banks, percentage 0.02%cvbf_InvestmentContractualCashFlowsGuaranteedByBanks
/ us-gaap_InvestmentTypeAxis
= us-gaap_CollateralizedMortgageObligationsMember
   
Alt-A bond [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Book value of the bond 1,500,000us-gaap_HeldToMaturitySecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateBondSecuritiesMember
   
Net impairment losses $ 1,900,000us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxHeldtomaturityDebtSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_CorporateBondSecuritiesMember
   
Municipal bonds [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Average life of investment grade debt securities, years 8 years 6 months