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First US Bancshares, Inc. (Parent Company Only) Financial Information - Statements of Balance Sheet (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash on deposit	$ 57,030	$ 49,599
Investment in subsidiaries		5
Other assets	9,739	7,954
Total assets	788,738	791,939
Other liabilities	9,766	6,826
Shareholders’ equity	84,748	79,437	$ 76,208
Total liabilities and shareholders’ equity	788,738	791,939
FUSB [Member]
Cash on deposit	476	265
Investment in subsidiaries	84,186	79,097
Other assets	246	326
Total assets	84,908	79,688
Other liabilities	160	251
Shareholders’ equity	84,748	79,437
Total liabilities and shareholders’ equity	$ 84,908	$ 79,688

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