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Investment Securities - Additional Information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items] |  |  |
Average life of investment grade debt securities, years | 3 years 9 months 18 days |  |
Gross unrealized holding losses | $ 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss |  |
Book value of the bond | 1,464,000 us-gaap_HeldToMaturitySecurities |  | 1,528,000 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 | 2,990,000,000 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral |  | 3,110,000,000 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 | 82.00%cvbf_SecuritiesIssuedByGovernmentOrGovernmentSponsoredAgenciesAndEnterprisesPercentage / us-gaap_StatementGeographicalAxis = country_US |  |
Government agency [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Agency bond callable | 140,900,000 cvbf_CallableSecuritiesAtCarryingValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember |  |
CMO's / REMIC's - residential [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
CMOs/REMICs backed by whole loans issued by private-label companies (non-government sponsored) | 304,000 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 | 78.76%cvbf_FairValuePercentageOfHeldToMaturitySecurityAgainstParValue / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember |  |
Investment contractual cash flows guaranteed by Government, percentage | 99.99%cvbf_InvestmentContractualCashFlowsGuaranteedByGovernment / us-gaap_InvestmentTypeAxis = us-gaap_CollateralizedMortgageObligationsMember |  |
Investment contractual cash flows guaranteed by banks, percentage | 1.00%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] |  |  |
Weighted-average life of investment grade debt securities, years | 8 years 4 months 24 days |  |

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- Definition Investment contractual cash flows guaranteed by banks. + References No definition available. + 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 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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