Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 12, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000354647
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2020
Amendment Flag	false
Document Annual Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Document Period End Date	Dec. 31, 2020
Entity Registrant Name	CVB FINANCIAL CORP.
Entity Current Reporting Status	Yes
Trading Symbol	CVBF
Title of 12(b) Security	Common Stock
Security Exchange Name	NASDAQ
Entity File Number	000-10140
Entity Incorporation, State or Country Code	CA
Entity Tax Identification Number	95-3629339
Entity Address, Address Line One	701 N. 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
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		135,873,607
Entity Public Float			$ 2,400,051,983
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
ICFR Auditor Attestation Flag	true