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Business - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 FinancialCenters Subsidiary | May 15, 2014 Branch | Sep. 30, 2014 Branch
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Schedule Of Description Of Company [Line Items] |  |  |
Number of inactive subsidiaries | 1 cvbf_NumberOfInactiveSubsidiaries |  |
Bank operated Business Financial Centers, number | 40 cvbf_BankOperatedBusinessFinancialCentersNumber |  |
Bank operated Commercial Banking Centers, number | 6 cvbf_BankOperatedCommercialBankingCentersNumber |  |
Bank operated trust office locations, number | 3 cvbf_BankOperatedWealthManagementOfficesNumber |  |
American Security Bank [Member] |  |  |
Schedule Of Description Of Company [Line Items] |  |  |
Total assets |  | $ 433 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = cvbf_AmericanSecurityBankMember |
Number of bank branches |  | 5 cvbf_NumberOfBranches / us-gaap_BusinessAcquisitionAxis = cvbf_AmericanSecurityBankMember |
Electronic Branch [Member] | American Security Bank [Member] |  |  |
Schedule Of Description Of Company [Line Items] |  |  |
Number of bank branches |  | 2 cvbf_NumberOfBranches / us-gaap_BusinessAcquisitionAxis = cvbf_AmericanSecurityBankMember / us-gaap_StatementBusinessSegmentsAxis = cvbf_ElectronicBranchMember |
Number of banking vestibules closed |  |  | 2 cvbf_NumberOfBranchesClosed / us-gaap_BusinessAcquisitionAxis = cvbf_AmericanSecurityBankMember / us-gaap_StatementBusinessSegmentsAxis = cvbf_ElectronicBranchMember

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- Definition Bank operated business financial centers, number. + References No definition available. + Details
Name: | cvbf_BankOperatedBusinessFinancialCentersNumber
Namespace Prefix: | cvbf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Bank operated commercial banking centers, number. + References No definition available. + Details
Name: | cvbf_BankOperatedCommercialBankingCentersNumber
Namespace Prefix: | cvbf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Bank operated wealth management offices, number. + References No definition available. + Details
Name: | cvbf_BankOperatedWealthManagementOfficesNumber
Namespace Prefix: | cvbf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Branches + References No definition available. + Details
Name: | cvbf_NumberOfBranches
Namespace Prefix: | cvbf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Branches Closed + References No definition available. + Details
Name: | cvbf_NumberOfBranchesClosed
Namespace Prefix: | cvbf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of inactive subsidiaries. + References No definition available. + Details
Name: | cvbf_NumberOfInactiveSubsidiaries
Namespace Prefix: | cvbf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | cvbf_ScheduleOfDescriptionOfCompanyLineItems
Namespace Prefix: | cvbf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=cvbf_AmericanSecurityBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=cvbf_ElectronicBranchMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |