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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Contingencies And Commitments [Line Items]
Commitments to extend credit	$ 1,610.0	$ 1,540.0
Obligations under letters of credit	53.2	53.1
Reserve for credit risk for undisbursed commitments	9.0	$ 9.0
Available lines of credit	4,290.0
Secured [Member]
Contingencies And Commitments [Line Items]
Available lines of credit	$ 3,900.0

X

- Definition

Commitments to extend credit.

+ References

No definition available.

+ Details

Name:	cvbf_CommitmentsToExtendCredit
Namespace Prefix:	cvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Contingencies And Commitments [Line Items]

+ References

No definition available.

+ Details

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

X

- Definition

Reserve for undisbursed commitments.

+ References

No definition available.

+ Details

Name:	cvbf_ReserveForUndisbursedCommitments
Namespace Prefix:	cvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: