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Summary of Significant Accounting Policies - Summary of Useful Lives of Principal Classes of Assets (Detail) | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Line Items] |
Estimated economic lives of leasehold improvements | Shorter of estimated economic lives of 15 years or term of the lease.
Minimum [Member] | Bank Premises [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful life of asset | 15 years
Minimum [Member] | Computer Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful life of asset | 3 years
Minimum [Member] | Furniture, Fixtures and Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful life of asset | 5 years
Maximum [Member] | Bank Premises [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful life of asset | 39 years
Maximum [Member] | Computer Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful life of asset | 5 years
Maximum [Member] | Furniture, Fixtures and Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Estimated useful life of asset | 7 years

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- Definition Useful life of long lived, physical leasehold improvement assets used in the normal conduct of business and not intended for resale. + References No definition available. + Details
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Namespace Prefix: | cvbf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |