Description of Business	12 Months Ended
Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	1. DESCRIPTION OF BUSINESS First US Bancshares, Inc., a Delaware corporation (“Bancshares” and, together with its subsidiaries, the “Company”), is a bank holding company formed in 1983 registered under the Bank Holding Company Act of 1956, as amended (the “BHCA”). Bancshares operates one banking subsidiary, First US Bank, an Alabama banking corporation (the “Bank”). Prior to its name change on October 11, 2016, Bancshares was known as United Security Bancshares, Inc. Bancshares and the Bank are headquartered in Birmingham, Alabama. The Bank conducts a general commercial banking business and offers banking services such as demand, savings, individual retirement account and time deposits, personal and commercial loans, safe deposit box services and remote deposit capture. The Bank operates and serves its customers through 15 full-service 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; as well as 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. The Bank has two wholly owned subsidiaries: Acceptance Loan Company, Inc., an Alabama corporation (“ALC”), and FUSB Reinsurance, Inc., an Arizona corporation (“FUSB Reinsurance”). As used herein, unless the context suggests otherwise, references to the “Company,” “we,” “us” and “our” refer to Bancshares, as well as the Bank, ALC, and FUSB Reinsurance, collectively. The Bank owns all of the stock of 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. ALC continues to service its remaining portfolio of loans from its headquarters in Mobile, Alabama. FUSB Reinsurance was designed to reinsure or “underwrite” credit life and credit accident and health insurance policies sold to the Bank’s and ALC’s consumer loan customers. FUSB Reinsurance was responsible for the first level of risk on these policies up to a specified maximum amount, while the primary third-party insurer retained the remaining risk. While FUSB Reinsurance underwrote insurance contracts for both the Bank and ALC, in recent years, the majority of contracts were associated with ALC’s loans. Due to reduced contract volume, particularly following the cessation of business of ALC, during 2022, management of FUSB Reinsurance began procedures to terminate the entity’s activities. During 2022, FUSB Reinsurance ceased writing new insurance contracts, and reached an agreement with a third-party insurance provider to indemnify FUSB Reinsurance for all remaining liabilities associated with previously underwritten insurance policies. As of December 31, 2022, the remaining assets and liabilities of FUSB Reinsurance were transferred to the Bank, and it is anticipated that FUSB Reinsurance will be legally dissolved during 2023.

Description of Business

12 Months Ended

Dec. 31, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

DESCRIPTION OF BUSINESS

First US Bancshares, Inc., a Delaware corporation (“Bancshares” and, together with its subsidiaries, the “Company”), is a bank holding company formed in 1983 registered under the Bank Holding Company Act of 1956, as amended (the “BHCA”). Bancshares operates one banking subsidiary, First US Bank, an Alabama banking corporation (the “Bank”). Prior to its name change on October 11, 2016, Bancshares was known as United Security Bancshares, Inc. Bancshares and the Bank are headquartered in Birmingham, Alabama.

The Bank conducts a general commercial banking business and offers banking services such as demand, savings, individual retirement account and time deposits, personal and commercial loans, safe deposit box services and remote deposit capture. The Bank operates and serves its customers through 15 full-service 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; as well as 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.

The Bank has two wholly owned subsidiaries: Acceptance Loan Company, Inc., an Alabama corporation (“ALC”), and FUSB Reinsurance, Inc., an Arizona corporation (“FUSB Reinsurance”). As used herein, unless the context suggests otherwise, references to the “Company,” “we,” “us” and “our” refer to Bancshares, as well as the Bank, ALC, and FUSB Reinsurance, collectively.

The Bank owns all of the stock of 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. ALC continues to service its remaining portfolio of loans from its headquarters in Mobile, Alabama.

FUSB Reinsurance was designed to reinsure or “underwrite” credit life and credit accident and health insurance policies sold to the Bank’s and ALC’s consumer loan customers. FUSB Reinsurance was responsible for the first level of risk on these policies up to a specified maximum amount, while the primary third-party insurer retained the remaining risk. While FUSB Reinsurance underwrote insurance contracts for both the Bank and ALC, in recent years, the majority of contracts were associated with ALC’s loans. Due to reduced contract volume, particularly following the cessation of business of ALC, during 2022, management of FUSB Reinsurance began procedures to terminate the entity’s activities. During 2022, FUSB Reinsurance ceased writing new insurance contracts, and reached an agreement with a third-party insurance provider to indemnify FUSB Reinsurance for all remaining liabilities associated with previously underwritten insurance policies. As of December 31, 2022, the remaining assets and liabilities of FUSB Reinsurance were transferred to the Bank, and it is anticipated that FUSB Reinsurance will be legally dissolved during 2023.