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Loans and Lease Finance Receivables and Allowance for Loan Losses - Summary of Loan, Including PCI Loans by Internal Risk Ratings (Parenthetical) (Detail) - USD ($)	3 Months Ended
	Sep. 30, 2018	Dec. 31, 2018
Payments to Acquire Loans Receivable	$ 19,000,000.0
Financial Asset Acquired with Credit Deterioration [Member]
PCI Loans		$ 17,200,000
Financial Asset Acquired with Credit Deterioration [Member] | Pass [Member]
PCI Loans		15,800,000
Financial Asset Acquired with Credit Deterioration [Member] | Special Mention [Member]
PCI Loans		1,200,000
Financial Asset Acquired with Credit Deterioration [Member] | Substandard [Member]
PCI Loans		224,000
Financial Asset Acquired with Credit Deterioration [Member] | Doubtful [Member]
PCI Loans		$ 0

X

- Definition

Gross purchased credit impaired loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	cvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The cash outflow for the purchase of loan receivable arising from the financing of goods and services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

+ Details

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Balance Type:	credit
Period Type:	duration

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- Details

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- Details

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