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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Mar. 03, 2025
Jun. 30, 2024
Cover [Abstract]      
Entity Registrant Name FIRST US BANCSHARES, INC    
Document Type 10-K    
Trading Symbol FUSB    
Current Fiscal Year End Date --12-31    
Entity Common Stock, Shares Outstanding   5,762,262  
Entity Central Index Key 0000717806    
Entity Filer Category Non-accelerated Filer    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Shell Company false    
Entity Small Business true    
Entity Emerging Growth Company false    
Security Exchange Name NASDAQ    
Entity File Number 000-14549    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 63-0843362    
Entity Address, Address Line One 3291 U.S. Highway 280    
Entity Address, City or Town Birmingham    
Entity Address, State or Province AL    
Entity Address, Postal Zip Code 35243    
City Area Code 205    
Local Phone Number 582-1200    
Document Annual Report true    
Document Transition Report false    
ICFR Auditor Attestation Flag false    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Document Financial Statement Error Correction [Flag] false    
Entity Public Float     $ 48,712,850
Amendment Flag false    
Auditor Firm ID 213    
Auditor Name Carr, Riggs & Ingram, LLC    
Auditor Location Atlanta, Georgia, United States    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive proxy statement for the 2025 Annual Meeting of Shareholders to be held on May 1, 2025 are incorporated by reference into Part III of this Annual Report on Form 10-K.

    
Auditor Opinion [Text Block]

Opinion on the Financial Statements

 

We have audited the accompanying consolidated balance sheets of First US Bancshares, Inc. and subsidiaries (the "Company") as of December 31, 2024 and 2023, the related consolidated statements of operations, comprehensive income, changes in shareholders’ equity, and cash flows for each of the two years in the period ended December 31, 2024, and the related notes (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the consolidated financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the two years in the period ended December 31, 2024, in conformity with accounting principles generally accepted in the United States of America.