Allocation of reserves to troubled debt restructuring.

No definition available.

Name:	cvbf_AllocationOfReservesToTroubledDebtRestructuring
Namespace Prefix:	cvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Provision for unfunded commitments during the period, representing either increases or decreases.

+ References

No definition available.

+ Details

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

- Definition

Loans classified as a troubled debt restructured.

+ References

No definition available.

+ Details

Name:	cvbf_LoansClassifiedAsTroubledDebtRestructured
Namespace Prefix:	cvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Loans receivable percentage of portfolio.

+ References

No definition available.

+ Details

Name:	cvbf_LoansReceivablePercentageOfPortfolio
Namespace Prefix:	cvbf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Number Of Loans

+ References

No definition available.

+ Details

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

- 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

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

- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

+ Details

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

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524

+ Details

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

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

+ Details

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

- Definition

Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524

+ Details

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

- Definition

Amount before allowance of loans issued to agricultural institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(a)(1))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5066-111524

+ Details

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

- Definition

Amount before allowance of mortgage loans on existing land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5066-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(a)(3))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- Definition

Amount of loan with fixed rate of interest.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

+ Details

Name:	us-gaap_LoansReceivableWithFixedRatesOfInterest1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_BusinessAcquisitionAxis=cvbf_CommunityBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cvbf_NonaccrualSmallBusinessAdministrationLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cvbf_ImpairedLoansModifiedInTroubledDebtRestructureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cvbf_SingleFamilyResidentialLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=cvbf_ConsumerAndOtherLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_NonperformingFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_PerformingFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cvbf_CommercialAndIndustrialLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cvbf_SmallBusinessAdministrationLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=cvbf_LoansExcludingPurchasedCreditImpairedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cvbf_DairyAndLivestockLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cvbf_AgribusinessMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=cvbf_DairyLivestockAndAgribusinessMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=cvbf_SecuredByFarmLandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorPropertyClassAxis=cvbf_SecuredByDairyAndLiveStockLandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MajorPropertyClassAxis=cvbf_SecuredByAgriculturalLandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Loans and Lease Finance Receivables and Allowance for Loan Losses - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2019 USD ($) SecurityLoan	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total fixed rate loans held	$ 3,790,000,000
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank	6,180,000,000		$ 5,710,000,000
Impaired, at carrying value	20,290,000	$ 14,457,000	23,545,000
Loans classified as troubled debt restructured	3,600,000
Impaired, at carrying value	435,000	0	561,000
Reserve for credit risk for undisbursed commitments	0		9,000,000
Allocation of allowance to troubled debt restructuring	$ 0		490,000,000
Community Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in reserve for unfunded loan commitments		$ 2,900,000
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	76.31%
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	70.94%
Nonaccrual Small Business Administration Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	$ 0
Impaired Loans Modified in Troubled Debt Restructure [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired, at carrying value	3,600,000
Single-family Residential Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	2,900,000
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	1,100,000
Nonaccrual Single Family Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	8,400,000
Consumer and Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	4,100,000
Nonperforming Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired, at carrying value	277,000,000,000
Loans classified as troubled debt restructured	0
Performing Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired, at carrying value	20,300,000
Loans classified as troubled debt restructured	3,300,000
Performing Financing Receivable [Member] \| Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	$ 563,000
Number of loans \| SecurityLoan	1
Performing Financing Receivable [Member] \| Impaired Loans Modified in Troubled Debt Restructure [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	$ 3,300,000
Performing Financing Receivable [Member] \| Single-family Residential Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	2,200,000
Performing Financing Receivable [Member] \| Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	$ 124,000
Number of loans \| SecurityLoan	2
Performing Financing Receivable [Member] \| Small Business Administration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured	$ 455,000
Number of loans \| SecurityLoan	1
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate loans	$ 5,388,866,000		5,394,229,000
Dairy & livestock and agribusiness	322,321,000		393,843,000
Impaired, at carrying value			23,500,000
Outstanding balance	16,991,000		19,951,000
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dairy & livestock and agribusiness	264,800,000		340,500,000
Loans, Excluding PCI Loans [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Dairy & livestock and agribusiness	57,600,000		53,300,000
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock and Agribusiness [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	0		78,000
Loans, Excluding PCI Loans [Member] \| Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	8,388,000		7,490,000
Loans, Excluding PCI Loans [Member] \| Small Business Administration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	$ 4,098,000		$ 2,892,000
Loans, Excluding PCI Loans [Member] \| Loans Secured by Farmland [Member] \| Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)	4.29%		4.26%
Commercial real estate loans	$ 231,100,000		$ 229,800,000
Loans, Excluding PCI Loans [Member] \| Loans Secured by Farmland [Member] \| Loans Secured by Dairy & Livestock Land [Member] \| Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate loans	124,200,000		126,900,000
Loans, Excluding PCI Loans [Member] \| Loans Secured by Farmland [Member] \| Loans Secured by Agricultural Land [Member] \| Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate loans	$ 106,900,000		$ 102,900,000