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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