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First US Bancshares, Inc. (Parent Company Only) Financial Information - Statements of Cash Flow (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |
Net income | $ 1,714 | $ 2,222 | $ 2,127 | $ 2,107 | $ 2,277 | $ 2,113 | $ 2,023 | $ 2,072 | $ 8,170 | $ 8,485
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 7,761 | 13,067
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |
Net share-based compensation transactions |  |  |  |  |  |  |  |  | 64 | (25)
Dividends paid |  |  |  |  |  |  |  |  | (1,264) | (1,175)
Treasury stock repurchases |  |  |  |  |  |  |  |  | (1,643) | (1,422)
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 19,523 | 67,506
Net (decrease) increase in cash and cash equivalents |  |  |  |  |  |  |  |  | (3,063) | 20,127
Cash and cash equivalents, beginning of period |  |  |  | 50,279 |  |  |  | 30,152 | 50,279 | 30,152
Cash and cash equivalents, end of period | 47,216 |  |  |  | 50,279 |  |  |  | 47,216 | 50,279
FUSB [Member] |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 8,170 | 8,485
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |
Distributions in excess of undistributed income of subsidiaries |  |  |  |  |  |  |  |  | (4,079) | (6,387)
Change in other assets and liabilities |  |  |  |  |  |  |  |  | (388) | (475)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 3,703 | 1,623
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |
Net share-based compensation transactions |  |  |  |  |  |  |  |  | 64 | (25)
Dividends paid |  |  |  |  |  |  |  |  | (1,264) | (1,175)
Treasury stock repurchases |  |  |  |  |  |  |  |  | (1,643) | (1,422)
Net cash provided by financing activities |  |  |  |  |  |  |  |  | (2,843) | (2,622)
Net (decrease) increase in cash and cash equivalents |  |  |  |  |  |  |  |  | 860 | (999)
Cash and cash equivalents, beginning of period |  |  |  | $ 1,856 |  |  |  | $ 2,855 | 1,856 | 2,855
Cash and cash equivalents, end of period | $ 2,716 |  |  |  | $ 1,856 |  |  |  | $ 2,716 | $ 1,856

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