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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 0 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 16, 2009 | Dec. 31, 2014 Segment Office Plans | Oct. 16, 2009
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of operating business segments |  | 2 us-gaap_NumberOfOperatingSegments |
Number of days on which collection of interest on principal is no longer probable |  | 90 days |
Period over which borrower has to demonstrate repayment performance in compliance with restructured terms to take loan out of nonaccrual status |  | 6 months |
Original terms of modified loans |  | 6 months |
Number of days on which charge-offs unsecured consumer loans are recorded |  | 120 days |
Minimum loan amount for credit review process |  | $ 1,000,000 cvbf_MinimumLoanAmountForAnnualCreditReviewProcess |
Allowance for loan losses look-back period, revised |  | Rolling twenty quarters |
Agreed percentage of losses in loss sharing agreement | 80.00%cvbf_PercentageOfLossReimbursementAndRecoverySharingOne |  | 80.00%cvbf_PercentageOfLossReimbursementAndRecoverySharingOne
Loss amount with respect to covered assets | 26,700,000 cvbf_FirstLossAmountCoveredAssets |  |
Agreed percentage of reimbursement in loss sharing agreement | 95.00%cvbf_PercentageOfLossReimbursementAndRecoverySharingTwo |  |
Commercial loans expiration date |  | Oct. 16, 2014 |
Goodwill impairment |  | 0 us-gaap_GoodwillAndIntangibleAssetImpairment |
Number of stock-based employee compensation plans |  | 3 cvbf_NumberOfStockBasedCompensationPlans |
Number of offices providing services, CitizensTrust |  | 3 cvbf_NumberOfServiceProviderOffice |
Assets under administration, CitizensTrust |  | 2,410,000,000 cvbf_AssetsUnderAdministration |
Assets under management, CitizensTrust |  | 1,870,000,000 us-gaap_AssetsUnderManagementCarryingAmount |
Commercial Loans [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Loss sharing agreement term | 5 years |  |
Loss recovery provisions term | 8 years |  |
Single-family Residential Loans [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Loss sharing agreement term | 10 years |  |
Loss recovery provisions term | 10 years |  |
Previously Reported [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Allowance for loan losses look-back period, previous |  | 3 years |
Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of days over which principal or interest payments are past due to consider loans, excluding PCI loans |  | 30 days |
Number of days for which principal or interest payments on loans, excluding PCI loans remain accrual |  | 30 days |
Length of modified debt term |  | 3 months |
Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of days for which principal or interest payments on loans, excluding PCI loans remain accrual |  | 89 days |
Length of modified debt term |  | 12 months |
Loss recoveries on covered assets | $ 144,000,000 cvbf_SecondLossAmountCoveredAssets / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

X
- Definition Assets under administration. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Contractual Agreement Termination Date + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Pursuant to loss sharing agreement, losses incurred prior to losses covered by FDIC in loss sharing agreement. + References No definition available. + Details
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- Definition Look Back Period, Non Rolling + References No definition available. + Details
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- Definition Look Back Period, Rolling + References No definition available. + Details
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- Definition Loss recovery provision term. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Loss sharing agreement term. + References No definition available. + Details
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Period Type: | duration

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- Definition Represents the minimum threshold for loans that are subject to an annual credit review process, where all aspects of the loan, including the borrower and guarantor(s) undergo review. This review process may result in changes to the internal credit risk rating of the loan. + References No definition available. + Details
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Namespace Prefix: | cvbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Number of service provider office. + References No definition available. + Details
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Period Type: | duration

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- Definition Number of stock-based compensation plans. + References No definition available. + Details
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- Definition Original term of modified loans. + References No definition available. + Details
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- Definition Percentage of losses reimbursed by the FDIC, and percentage of recoveries of prior losses shared with the FDIC up to threshold stated in loss sharing agreement with the FDIC. + References No definition available. + Details
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- Definition Percentage of losses reimbursed by the FDIC, and percentage of recoveries of prior losses shared with the FDIC over and above threshold stated in loss sharing agreement with the FDIC. + References No definition available. + Details
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Period Type: | duration

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- Definition Period for principal or interest payment on loans remain accrual. + References No definition available. + Details
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Namespace Prefix: | cvbf_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Period over which borrower has to demonstrate repayment performance in compliance with restructured terms to take loan out of nonaccrual status. + References No definition available. + Details
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- Definition Period when principal or interest payment are past due to consider loans. + References No definition available. + Details
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- Definition Period Which Charge Offs Unsecured Consumer Loan Are Recorded + References No definition available. + Details
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- Definition Pursuant to loss sharing agreement, losses covered by FDIC. + References No definition available. + Details
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Namespace Prefix: | cvbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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- Definition Troubled debt restructuring modified term. + References No definition available. + Details
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- Definition The carrying amount of assets an investment adviser manages on behalf of investors. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Total loss recognized during the period from the impairment of goodwill plus the loss recognized in the period resulting from the impairment of the carrying amount of intangible assets, other than goodwill. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Details
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