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Deposits - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deposits [Abstract] |  |  |
Balance of accounts with more than $250,000 balance | $ 108,500,000 | $ 104,700,000 |
Interest expenses on accounts with more than $250,000 balance | $ 545,000 | $ 444,000 | $ 787,000

X
- Definition Interest expense time deposits 250000 or more. + References No definition available. + Details
Name: | cvbf_InterestExpenseTimeDeposits250000OrMore
Namespace Prefix: | cvbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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

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