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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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