| Document and Entity Information | Jan. 27, 2021 |
| Cover [Abstract] | |
| Entity Registrant Name | CVB FINANCIAL CORP |
| Amendment Flag | false |
| Entity Central Index Key | 0000354647 |
| Document Type | 8-K |
| Document Period End Date | Jan. 27, 2021 |
| Entity Incorporation State Country Code | CA |
| Entity File Number | 000-10140 |
| Entity Tax Identification Number | 95-3629339 |
| Entity Address, Address Line One | 701 North Haven Avenue |
| Entity Address, City or Town | Ontario |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 91764 |
| City Area Code | (909) |
| Local Phone Number | 980-4030 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, No Par Value |
| Trading Symbol | CVBF |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
