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Acquired SJB Assets and FDIC Loss Sharing Asset - Summary of Activity Related to FDIC Loss Sharing Asset (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
FDIC Indemnification Asset [Roll Forward] |  |
Balance, beginning of period | $ 4,764 us-gaap_FDICIndemnificationAsset | $ 18,489 us-gaap_FDICIndemnificationAsset
FDIC share of additional losses, net of recoveries | 342 cvbf_FdicShareOfAdditionalLossesIncreasesDecreasesNet | (81)cvbf_FdicShareOfAdditionalLossesIncreasesDecreasesNet
Cash paid to (received from) FDIC, net | 1,134 us-gaap_FDICIndemnificationAssetCashPaymentsReceived | (4)us-gaap_FDICIndemnificationAssetCashPaymentsReceived
Net amortization | (3,932)us-gaap_FDICIndemnificationAssetNetWriteOffs | (12,779)us-gaap_FDICIndemnificationAssetNetWriteOffs
Other reductions, net | (2,009)cvbf_NetReductions | (861)cvbf_NetReductions
Balance, end of period | $ 299 us-gaap_FDICIndemnificationAsset | $ 4,764 us-gaap_FDICIndemnificationAsset

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- Definition FDIC Share of Additional Losses Increases Decreases Net + References No definition available. + Details
Name: | cvbf_FdicShareOfAdditionalLossesIncreasesDecreasesNet
Namespace Prefix: | cvbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Net other reductions in FDIC loss sharing asset during the period. + References No definition available. + Details
Name: | cvbf_NetReductions
Namespace Prefix: | cvbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Carrying amount of receivable assets originating from the indemnification agreement with the Federal Deposit Insurance Corporation (FDIC), in which the FDIC is to partially cover losses. + References No definition available. + Details
Name: | us-gaap_FDICIndemnificationAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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 Amount of decreases to the indemnification asset due to write offs of loans, net of recoveries, relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC). + References No definition available. + Details
Name: | us-gaap_FDICIndemnificationAssetNetWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_FDICIndemnificationAssetRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration