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First US Bancshares, Inc. (Parent Company Only) Financial Information - Statements of Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Income:                    
Total income                 $ 1,197 $ 1,154
Expense                 5,142 4,424
Net income (loss) $ 2,277 $ 2,113 $ 2,023 $ 2,072 $ 2,228 $ 1,860 $ 1,415 $ 1,361 8,485 6,864
FUSB [Member]                    
Income:                    
Dividend income, First US Bank                 3,460 3,463
Total income                 3,460 3,463
Expense                 1,362 1,320
Gain before equity in undistributed income of subsidiaries                 2,098 2,143
Equity in undistributed income of subsidiaries                 6,387 4,721
Net income (loss)                 $ 8,485 $ 6,864