Business Segments - Schedule of Segment Reporting Information by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Interest income, including loan fees	$ 64,180	$ 61,062
Credit for funds provided	0	0
Total interest income	64,180	61,062
Interest expense	3,171cvbf_InterestExpenses	4,120cvbf_InterestExpenses
Charge for funds used	0cvbf_SegmentReportingChargeForFundsUsed	0cvbf_SegmentReportingChargeForFundsUsed
Total interest expense	3,171us-gaap_InterestExpense	4,120us-gaap_InterestExpense
Net interest income	61,009us-gaap_InterestIncomeExpenseNet	56,942us-gaap_InterestIncomeExpenseNet
Provision for loan losses	0	(7,500)
Net interest income after provision for loan losses	61,009	64,442
Noninterest income	8,011us-gaap_NoninterestIncome	11,498us-gaap_NoninterestIncome
Noninterest expense	44,472us-gaap_NoninterestExpense	31,157us-gaap_NoninterestExpense
Debt termination expense	13,870cvbf_PrepaymentPenaltiesOnBorrowings	0cvbf_PrepaymentPenaltiesOnBorrowings
Earnings before income taxes	24,548	44,783
Segment assets	7,442,951us-gaap_Assets	6,902,518us-gaap_Assets	7,377,920us-gaap_Assets
Operating segments [Member] \| Centers [Member]
Segment Reporting Information [Line Items]
Interest income, including loan fees	35,368	33,091
Credit for funds provided	8,211	7,074
Total interest income	43,579	40,165
Interest expense	1,663	1,637
Charge for funds used	1,067	1,090
Total interest expense	2,730	2,727
Net interest income	40,849	37,438
Provision for loan losses	0	0
Net interest income after provision for loan losses	40,849	37,438
Noninterest income	5,067	4,782
Noninterest expense	11,849	11,828
Debt termination expense	0	0
Earnings before income taxes	34,067	30,392
Segment assets	6,216,028	5,525,494
Operating segments [Member] \| Treasury [Member]
Segment Reporting Information [Line Items]
Interest income, including loan fees	18,655	16,432
Credit for funds provided	0	0
Total interest income	18,655	16,432
Interest expense	1,431	2,373
Charge for funds used	14,806	12,797
Total interest expense	16,237	15,170
Net interest income	2,418	1,262
Provision for loan losses	0	0
Net interest income after provision for loan losses	2,418	1,262
Noninterest income	0	0
Noninterest expense	213	196
Debt termination expense	13,870	0
Earnings before income taxes	(11,665)	1,066
Segment assets	3,450,529	3,264,736
Operating segments [Member] \| Other [Member]
Segment Reporting Information [Line Items]
Interest income, including loan fees	10,157	11,539
Credit for funds provided	12,641	11,463
Total interest income	22,798	23,002
Interest expense	77	110
Charge for funds used	4,979	4,650
Total interest expense	5,056	4,760
Net interest income	17,742	18,242
Provision for loan losses	0	(7,500)
Net interest income after provision for loan losses	17,742	25,742
Noninterest income	2,944	6,716
Noninterest expense	18,540	19,133
Debt termination expense	0	0
Earnings before income taxes	2,146	13,325
Segment assets	898,554	843,026
Eliminations [Member]
Segment Reporting Information [Line Items]
Interest income, including loan fees	0	0
Credit for funds provided	(20,852)	(18,537)
Total interest income	(20,852)	(18,537)
Interest expense	0	0
Charge for funds used	(20,852)	(18,537)
Total interest expense	(20,852)	(18,537)
Net interest income	0	0
Provision for loan losses	0	0
Net interest income after provision for loan losses	0	0
Noninterest income	0	0
Noninterest expense	0	0
Debt termination expense	0	0
Earnings before income taxes	0	0
Segment assets	$ (3,122,160)	$ (2,730,738)

Interest expenses.

No definition available.

Name:	cvbf_InterestExpenses
Namespace Prefix:	cvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Interest income on loans and investments.

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

Debt termination.

+ References

No definition available.

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- Definition

Segment reporting charge for funds used.

+ References

No definition available.

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- Definition

Segment reporting credit for funds provided.

+ References

No definition available.

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- Definition

Amount of other addition (reduction) in allowance reserve for credit loss.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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-Topic 942

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph d

-Article 9

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.18)

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-Section 02

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Period Type:	instant

- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

+ References

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-Publisher FASB

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-Topic 940

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- Definition

Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein.

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-Topic 942

-SubTopic 225

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-Paragraph 1

-Subparagraph (SX 210.9-04.1-5)

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-Number 210

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-Paragraph 1, 2 , 3, 4, 5

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

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- Definition

Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses.

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- Definition

The net amount of operating interest income (expense).

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- Definition

Total aggregate amount of all noninterest expense.

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-Topic 942

-SubTopic 225

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-Number 210

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- Definition

The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified.

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