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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 |

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- 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

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- 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

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- 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

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- 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

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- 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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |