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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, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:                    
Net income $ 2,277 $ 2,113 $ 2,023 $ 2,072 $ 2,228 $ 1,860 $ 1,415 $ 1,361 $ 8,485 $ 6,864
Adjustments to reconcile net income to net cash provided by operating activities:                    
Net cash provided by operating activities                 13,067 12,529
Cash flows from investing activities:                    
Net cash used in investing activities                 (60,446) (80,199)
Cash flows from financing activities:                    
Net share-based compensation transactions                 (25)  
Dividends paid                 (1,175) (832)
Treasury stock repurchases                 (1,422) (4,481)
Net cash provided by financing activities                 67,506 36,578
Net increase (decrease) in cash and cash equivalents                 20,127 (31,092)
Cash and cash equivalents, beginning of period       30,152       61,244 30,152 61,244
Cash and cash equivalents, end of period 50,279       30,152       50,279 30,152
FUSB [Member]                    
Cash flows from operating activities:                    
Net income                 8,485 6,864
Adjustments to reconcile net income to net cash provided by operating activities:                    
Distributions in excess of undistributed income of subsidiaries                 (6,387) (4,721)
Change in other assets and liabilities                 (475) 135
Net cash provided by operating activities                 1,623 2,278
Cash flows from financing activities:                    
Net share-based compensation transactions                 (25)  
Dividends paid                 (1,175) (832)
Treasury stock repurchases                 (1,422) (4,481)
Net cash provided by financing activities                 (2,622) (5,313)
Net increase (decrease) in cash and cash equivalents                 (999) (3,035)
Cash and cash equivalents, beginning of period       $ 2,855       $ 5,890 2,855 5,890
Cash and cash equivalents, end of period $ 1,856       $ 2,855       $ 1,856 $ 2,855