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First US Bancshares, Inc. (Parent Company Only) Financial Information - Statements of Balance Sheet (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Cash on deposit | $ 47,216 | $ 50,279 |
Other assets | 11,022 | 10,748 |
Total assets | 1,101,086 | 1,072,940 |
Other liabilities | 7,282 | 9,327 |
Long-term borrowings | 10,872 | 10,799 |
Shareholders’ equity | 98,624 | 90,593 | $ 85,135
Total liabilities and shareholders’ equity | 1,101,086 | 1,072,940 |
FUSB [Member] |  |  |
Cash on deposit | 2,716 | 1,856 |
Investment in subsidiaries | 106,167 | 99,395 |
Other assets | 718 | 343 |
Total assets | 109,601 | 101,594 |
Other liabilities | 105 | 201 |
Long-term borrowings | 10,872 | 10,799 |
Shareholders’ equity | 98,624 | 90,594 |
Total liabilities and shareholders’ equity | $ 109,601 | $ 101,594 |

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