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Stock Option Plans and Restricted Stock Awards - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended
May 31, 2008
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option plan, options outstanding   1,688,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 2,106,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber  
Total expenses on stock option   $ 876,000us-gaap_AllocatedShareBasedCompensationExpense $ 850,000us-gaap_AllocatedShareBasedCompensationExpense $ 1,100,000us-gaap_AllocatedShareBasedCompensationExpense
Stock options granted under Black-Scholes options pricing model   169,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod 45,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod 248,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
Forfeiture rate   6.00%cvbf_PercentageOfForfeitureRate    
Intrinsic value of options exercised   2,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 1,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 618,000.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Unrecognized compensation cost related to nonvested options granted   1,300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Weighted-average period for expected cost recognized   3 years 4 months 24 days    
Fair value of options vested   841,000cvbf_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsVestedInPeriodFairValue 918,000cvbf_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsVestedInPeriodFairValue 1,100,000cvbf_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsVestedInPeriodFairValue
Cash received from stock option exercises   5,500,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions 4,500,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions 2,600,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
Common stock, shares outstanding   105,893,216us-gaap_CommonStockSharesOutstanding 105,370,170us-gaap_CommonStockSharesOutstanding  
Number of common shares, options exercisable   1,317,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber    
Options exercisable lower price range   $ 7.68us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit    
Options exercisable upper price range   $ 16.97us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit    
Period of compensation cost recognized   5 years    
Amount of compensation cost recognized   2,100,000cvbf_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionCompensationCost 1,100,000cvbf_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionCompensationCost 911,000cvbf_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionCompensationCost
Common stock available for the granting of future options and restricted stock   1,021,822cvbf_CommonStockAvailableForGrantingOfFutureOptionsAndRestrictedStock    
Common Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of common shares, options exercisable   1,316,726us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		    
2008 Equity Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized issuance of shares of Company common stock 3,949,891cvbf_ShareBasedCompensationArrangementBySharesBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= cvbf_EquityIncentivePlanTwoThousandEightMember		      
Expiry of equity incentive plan   2018    
Vesting period   5 years 5 years 5 years
2008 Equity Incentive Plan, granted restricted stock awards   400,000cvbf_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesThatRemainAvailableForGrantsAsRestrictedStockUnits
/ us-gaap_AwardTypeAxis
= cvbf_EquityIncentivePlanTwoThousandEightMember		 100,000cvbf_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesThatRemainAvailableForGrantsAsRestrictedStockUnits
/ us-gaap_AwardTypeAxis
= cvbf_EquityIncentivePlanTwoThousandEightMember		 173,000cvbf_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesThatRemainAvailableForGrantsAsRestrictedStockUnits
/ us-gaap_AwardTypeAxis
= cvbf_EquityIncentivePlanTwoThousandEightMember
Weighted average fair value of restricted stock   $ 14.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cvbf_EquityIncentivePlanTwoThousandEightMember		 $ 13.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cvbf_EquityIncentivePlanTwoThousandEightMember		 $ 11.10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cvbf_EquityIncentivePlanTwoThousandEightMember
2008 Stock Option Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option plan, options outstanding   390,698us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= cvbf_TwoThousandStockOptionPlanMember		    
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   5 years    
Common stock, shares outstanding   1,688,326us-gaap_CommonStockSharesOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		    
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost related to nonvested options granted   $ 6,300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		    
Weighted average fair value of restricted stock   $ 14.78us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember