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Business Segments - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2015 Segment FinancialCenters
Segment Reporting Information [Line Items]
Number of principal reporting segments	2us-gaap_NumberOfReportableSegments
Bank operated Business Financial Centers, number	40cvbf_BankOperatedBusinessFinancialCentersNumber
Bank operated Commercial Banking Centers, number	7cvbf_BankOperatedCommercialBankingCentersNumber
Consideration of Business Financial and Commercial Banking Centers	1cvbf_ConsiderationOfBusinessFinancialAndCommercialBankingCenter
Subsidiary bank [Member]
Segment Reporting Information [Line Items]
Bank operated Business Financial Centers, number	40cvbf_BankOperatedBusinessFinancialCentersNumber / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Bank operated Commercial Banking Centers, number	7cvbf_BankOperatedCommercialBankingCentersNumber / dei_LegalEntityAxis = us-gaap_SubsidiariesMember

X

- 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

X

- 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

X

- Definition

Consideration of business financial and commercial banking center.

+ References

No definition available.

+ Details

Name:	cvbf_ConsiderationOfBusinessFinancialAndCommercialBankingCenter
Namespace Prefix:	cvbf_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=us-gaap_SubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: