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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 28, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 000-32987    
Entity Registrant Name UNITED SECURITY BANCSHARES    
Entity Tax Identification Number 91-2112732    
Entity Address, Address Line One 2126 Inyo Street    
Entity Address, City or Town Fresno    
Entity Incorporation, State or Country Code CA    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 93721    
City Area Code 888    
Local Phone Number 683-6030    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 104,165,322
Entity Common Stock, Shares Outstanding   17,255,505  
Documents Incorporated by Reference
The information required by Items 10, 11, 12, 13 and 14 of Part III of this Annual Report on Form 10-K will be found in the Company’s definitive proxy statement for its 2025 Annual Meeting of Shareholders, to be filed pursuant to Regulation 14A under the Securities Exchange Act of 1934, as amended, and such information is incorporated herein by this reference.
    
Entity Central Index Key 0001137547    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false