XML 15 R1.htm IDEA: XBRL DOCUMENT v3.24.0.1
Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2023
Mar. 08, 2024
Jun. 30, 2023
Document Information [Line Items]      
Entity Central Index Key 0001499422    
Entity Registrant Name RBB Bancorp    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2023    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Document Transition Report false    
Entity File Number 001-38149    
Entity Incorporation, State or Country Code CA    
Entity Tax Identification Number 27-2776416    
Entity Address, Address Line One 1055 Wilshire Blvd., 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 12(b) Security Common Stock, No Par Value    
Trading Symbol RBB    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 207,343,729
Entity Common Stock, Shares Outstanding   18,621,781  
Auditor Name Crowe LLP    
Auditor Location Los Angeles, California    
Auditor Firm ID 173