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Acquired SJB Assets and FDIC Loss Sharing Asset - Summary of Activity Related to FDIC Loss Sharing Liability (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
FDIC Indemnification Asset [Roll Forward] |  |
Balance, beginning of period | $ (502) | $ (229)
FDIC share of recoveries, net of charge-offs | 0 | (5)
Cash paid to FDIC, net | 519 | 514
Other | (124) | (782)
Balance, end of period | $ (107) | $ (502)

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- Definition FDIC indemnification asset and liability. + References No definition available. + Details
Name: | cvbf_FdicIndemnificationAssetAndLiability
Namespace Prefix: | cvbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition FDIC indemnification asset and liability other. + References No definition available. + Details
Name: | cvbf_FdicIndemnificationAssetAndLiabilityOther
Namespace Prefix: | cvbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition FDIC share of recoveries, net of charge-offs. + References No definition available. + Details
Name: | cvbf_FdicShareOfRecoveriesNetOfChargeOffs
Namespace Prefix: | cvbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of decreases to the indemnification asset due to cash payments received relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC). + References No definition available. + Details
Name: | us-gaap_FDICIndemnificationAssetCashPaymentsReceived
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_FDICIndemnificationAssetRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration