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Cover Page - shares
 9 Months Ended
Sep. 30, 2019
Oct. 31, 2019
Cover [Abstract]    
Document Type 10-Q  
Current Fiscal Year End Date --12-31  
Entity Central Index Key 0000354647  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2019  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Document Period End Date Sep. 30, 2019  
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 North Haven Ave.,  
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   140,106,948