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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Operating Lease, Right-of-Use Asset	$ 19,809

X

- Definition

Summary Of Significant Accounting Policies [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	cvbf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

Name:	us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant