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Description of Business	12 Months Ended
	Dec. 31, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Description of Business	1. DESCRIPTION OF BUSINESS First US Bancshares, Inc. (“Bancshares”) and its wholly-owned subsidiary, First US Bank (the “Bank”), provide commercial banking services to customers through 15 banking offices located in Birmingham, Butler, Calera, Centreville, Gilbertown, Grove Hill, Harpersville, Jackson, Thomasville, Tuscaloosa and Woodstock, Alabama; Knoxville and Powell, Tennessee; and Rose Hill, Virginia. In addition, the Bank operates loan production offices in Mobile, Alabama and the Chattanooga, Tennessee area. The Bank provides a wide range of commercial banking services to small- and medium-sized businesses, property managers, business executives, professionals and other individuals. The Bank also performs indirect lending through third-party retailers and currently conducts this lending in 12 states, including Alabama, Florida, Georgia, Kentucky, Mississippi, Missouri, North Carolina, Oklahoma, South Carolina, Tennessee, Texas and Virginia. During the third quarter of 2021, the Company closed four banking offices located in Bucksville, Columbiana and south Tuscaloosa, Alabama, as well as Ewing, Virginia. Both Bancshares and the Bank are headquartered in Birmingham, Alabama. The Bank owns all of the stock of Acceptance Loan Company, Inc., an Alabama corporation (“ALC”). ALC is a finance company headquartered in Mobile, Alabama. During the third quarter of 2021, ALC ceased new business development and permanently closed its 20 branch lending locations in Alabama and Mississippi to the public. The Bank also owns all of the stock of FUSB Reinsurance, Inc. (“FUSB Reinsurance”), an Arizona corporation. FUSB Reinsurance is an insurance company that underwrites credit life and accidental death insurance related to consumer loans written by the Bank and ALC. Risks and Uncertainties The COVID-19 pandemic and its associated impacts on trade (including supply chains and export levels), travel, employee productivity and other economic activities have had, are currently having, and may for some time continue to have a destabilizing effect on financial markets and economic activity. The extent of the impact of COVID-19 on the Company’s operational and financial performance remains uncertain, cannot be predicted and will depend on certain developments, including, among others, the spread of COVID-19 and its variants, vaccination efforts, the duration of the pandemic, its impact on our customers, employees and vendors, and the continued governmental, regulatory and private sector responses, which may be precautionary, to COVID-19. The Company’s business, financial condition and results of operations generally rely upon the ability of the Company’s borrowers to repay their loans, the value of collateral underlying those loans, and demand for loans and other products and services that the Company offers, which are highly dependent on the business environment in the Company’s primary markets and the United States economy as a whole. In light of the changing economic outlook as a result of COVID-19, in March 2020, the Federal Reserve reduced the target federal funds rate by 150 basis points. These reductions in interest rates and other economic uncertainties that have arisen as a result primarily of the COVID-19 pandemic have negatively impacted net interest income, provisions for loan losses and noninterest income. Additional negative financial impacts could occur; however, the ultimate potential impact is not known at this time.

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- Definition

The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings. For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-URI http://asc.fasb.org/topic&trid=2134479

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- References

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