Loans and Lease Finance Receivables and Allowance for Loan Losses - Summary of Activity Related to Troubled Debt Restructurings (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Modifications [Line Items]
Total TDRs	$ 3,356	$ 7,103
Performing TDRs [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance	3,594	4,809
New modifications	0	311
Payoffs/payments, net and other	(482)	(1,526)
TDRs returned to accrual status	0	0
TDRs placed on nonaccrual status	0	0
Ending balance	3,112	3,594
Nonperforming TDRs [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance	3,509	4,200
New modifications	0	316
Charge-offs	(78)	0
Transfer to OREO	(2,275)	0
Payoffs/payments, net and other	(912)	(1,007)
TDRs returned to accrual status	0	0
TDRs placed on nonaccrual status	0	0
Ending balance	$ 244	$ 3,509

Financing Receivable Modifications Recorded Investments

No definition available.

Name:	cvbf_FinancingReceivableModificationsRecordedInvestments
Namespace Prefix:	cvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The increase (decrease) in performing troubled debt restructurings financing receivables, because of returns to accrual status.

+ References

No definition available.

+ Details

Name:	cvbf_FinancingReceivableRecordedInvestmentTroubledDebtRestructuringsAccrualStatus
Namespace Prefix:	cvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The decrease in performing troubled debt restructurings financing receivables, because of the change in accrual status to nonaccrual.

+ References

No definition available.

+ Details

Name:	cvbf_FinancingReceivableRecordedInvestmentTroubledDebtRestructuringsNonAccrualStatus
Namespace Prefix:	cvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Financing Receivables Impaired Troubled Debt Restructuring Additions

+ References

No definition available.

+ Details

Name:	cvbf_FinancingReceivablesImpairedTroubledDebtRestructuringAdditions
Namespace Prefix:	cvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Financing Receivables Impaired Troubled Debt Restructuring Payments

+ References

No definition available.

+ Details

Name:	cvbf_FinancingReceivablesImpairedTroubledDebtRestructuringPayments
Namespace Prefix:	cvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Amount of financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554

+ Details

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

- Definition

Reflects the amount of the write-down related to a troubled debt restructuring.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554

+ Details

Name:	us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Value transferred from mortgage loans to real estate owned (REO) in noncash transactions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

+ Details

Name:	us-gaap_TransferToOtherRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_FinancialInstrumentPerformanceStatusAxis=cvbf_PerformingTroubledDebtRestructuringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentPerformanceStatusAxis=cvbf_NonPerformingTroubledDebtRestructuredLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: