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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, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities:                    
Net income $ 2,228 $ 1,860 $ 1,415 $ 1,361 $ 1,711 $ 837 $ 953 $ 950 $ 6,864 $ 4,451
Adjustments to reconcile net income to net cash provided by operating activities:                    
Net cash provided by operating activities                 12,529 9,825
Cash flows from investing activities:                    
Net cash used in investing activities                 (80,199) (108,315)
Cash flows from financing activities:                    
Net proceeds from long-term borrowings                   10,653
Net share-based compensation transactions                   (7)
Dividends paid                 (832) (745)
Treasury stock repurchases                 (4,481) (525)
Net cash provided by financing activities                 36,578 65,319
Net decrease in cash and cash equivalents                 (31,092) (33,171)
Cash and cash equivalents, beginning of period       61,244       94,415 61,244 94,415
Cash and cash equivalents, end of period 30,152       61,244       30,152 61,244
FUSB [Member]                    
Cash flows from operating activities:                    
Net income                 6,864 4,451
Adjustments to reconcile net income to net cash provided by operating activities:                    
Distributions in excess of undistributed income of subsidiaries                 (4,721) (3,936)
Change in other assets and liabilities                 135 580
Net cash provided by operating activities                 2,278 1,095
Cash flows from investing activities:                    
Investment in subsidiaries                   (5,000)
Net cash used in investing activities                   (5,000)
Cash flows from financing activities:                    
Net proceeds from long-term borrowings                   10,653
Net share-based compensation transactions                   (7)
Dividends paid                 (832) (745)
Treasury stock repurchases                 (4,481) (525)
Net cash provided by financing activities                 (5,313) 9,376
Net decrease in cash and cash equivalents                 (3,035) 5,471
Cash and cash equivalents, beginning of period       $ 5,890       $ 419 5,890 419
Cash and cash equivalents, end of period $ 2,855       $ 5,890       $ 2,855 $ 5,890