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Business Segments - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 Location Segment
Segment Reporting [Abstract] |
Number of principal reporting segments | Segment | 2
Bank operated banking centers, number | Location | 50

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

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

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- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration