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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands | Jun. 30, 2019 USD ($)
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Summary Of Significant Accounting Policies [Line Items] |
Operating Lease, Right-of-Use Asset | $ 17,959

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- Definition Summary Of Significant Accounting Policies [Line Items] + References No definition available. + Details
Name: | cvbf_SummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | cvbf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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