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Investment Securities - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 Securities | Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items] |  |  |
Number of securities |  | 13 cvbf_NumberOfSecurities |
Investment securities, par value |  | $ 94,200,000 cvbf_AvailableForSaleSecuritiesAmortizedCostSoldDuringPeriod |
Pre-tax gain on sale of securities | 0 us-gaap_GainLossOnSaleOfSecuritiesNet | 2,094,000 us-gaap_GainLossOnSaleOfSecuritiesNet | 0 us-gaap_GainLossOnSaleOfSecuritiesNet
Gains (loss) recognized | 0 us-gaap_RealizedInvestmentGainsLosses |  |
Average life of investment grade debt securities, years | 4 years |  |
Gross unrealized holding losses | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss |  |
Book value of the bond | 1,528,000 us-gaap_HeldToMaturitySecurities | 1,777,000 us-gaap_HeldToMaturitySecurities |
Credit-related impairment loss on investment securities held-to-maturity | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentHeldtomaturitySecurities | 0 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentHeldtomaturitySecurities |
Investment securities pledged as collateral | 3,110,000,000 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral | 2,600,000,000 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral |
Investment in FHLB stock, impairment losses | 0 us-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 | 223,200,000 cvbf_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) | 343,000 cvbf_SecuritiesBackedByWholeLoans / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember |  |
Investment security classified as held-to-maturity, number | 1 cvbf_InvestmentSecurityClassifiedAsHeldToMaturityNumber / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember |  |
Held-to-Maturity securities, average FICO score | 715 cvbf_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 | 1,500,000 us-gaap_HeldToMaturitySecurities / us-gaap_InvestmentTypeAxis = us-gaap_CorporateBondSecuritiesMember |  |
Net impairment losses | $ 1,900,000 us-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 |  |

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- Definition Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as held-to-maturity that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (dd) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Subparagraph h -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 3 -Article 7 + Details
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