v3.25.1
Document and Entity Information
Apr. 30, 2025
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Apr. 30, 2025
Entity Registrant Name First US Bancshares, Inc.
Entity Central Index Key 0000717806
Entity Incorporation, State or Country Code DE
Entity File Number 000-14549
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
Title of 12(b) Security Common Stock, $0.01 par value
Trading Symbol FUSB
Security Exchange Name NASDAQ
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false