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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2019
Mar. 12, 2020
Jun. 30, 2019
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Annual Report true    
Document Transition Report false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Registrant Name RBB BANCORP    
Entity Central Index Key 0001499422    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   19,960,421  
Entity Public Float     $ 328,999,122
Entity Interactive Data Current Yes    
Entity Tax Identification Number 27-2776416    
Entity File Number 001-38149    
Entity Incorporation, State or Country Code CA    
Entity Address, Address Line One 1055 Wilshire Blvd.    
Entity Address, Address Line Two 12th floor    
Entity Address, City or Town Los Angeles    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 90017    
City Area Code 213    
Local Phone Number 627-9888    
Title of each class Common Stock, No Par Value    
Trading Symbol RBB    
Name of exchange on which registered NASDAQ    
Documents Incorporated by Reference

Portions of the Registrant’s Definitive Proxy Statement relating to the Annual Meeting of Shareholders, scheduled to be held on May 13, 2020, are incorporated by reference into Part III of this Report.