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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Income:                    
Expense                 $ 6,499 $ 5,965
Net income (loss) $ 1,209 $ 1,118 $ 1,005 $ 1,234 $ 1,477 $ 240 $ 359 $ 414 4,566 2,490
FUSB [Member]                    
Income:                    
Dividend income, First US Bank                 3,104 976
Total income                 3,104 976
Expense                 924 831
Gain before equity in undistributed income of subsidiaries                 2,180 145
Equity in undistributed income of subsidiaries                 2,386 2,345
Net income (loss)                 $ 4,566 $ 2,490