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Deposits - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Deposits [Abstract] |  |
Balance of accounts with more than $2500,000 balance | $ 100.3 | $ 107.9

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- Definition Time deposits 250000 or more. + References No definition available. + Details
Name: | cvbf_TimeDeposits250000OrMore
Namespace Prefix: | cvbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DepositsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration