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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, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities:                    
Net income $ 1,711 $ 837 $ 953 $ 950 $ 1,045 $ 411 $ 404 $ 847 $ 4,451 $ 2,707
Adjustments to reconcile net income to net cash provided by operating activities:                    
Net cash provided by operating activities                 9,825 6,094
Cash flows from investing activities:                    
Net cash used in investing activities                 (108,315) (66,059)
Cash flows from financing activities:                    
Net proceeds from long-term borrowings                 10,653  
Net share-based compensation transactions                 (7)  
Dividends paid                 (745) (740)
Treasury stock repurchases                 (525) (452)
Net cash provided by financing activities                 65,319 97,350
Net (decrease) increase in cash and cash equivalents                 (33,171) 37,385
Cash and cash equivalents, beginning of period       94,415       57,030 94,415 57,030
Cash and cash equivalents, end of period 61,244       94,415       61,244 94,415
FUSB [Member]                    
Cash flows from operating activities:                    
Net income                 4,451 2,707
Adjustments to reconcile net income to net cash provided by operating activities:                    
Distributions in excess of undistributed income of subsidiaries                 (3,936) (1,586)
Change in other assets and liabilities                 580 14
Net cash provided by operating activities                 1,095 1,135
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                 (745) (740)
Treasury stock repurchases                 (525) (452)
Net cash provided by financing activities                 9,376 (1,192)
Net (decrease) increase in cash and cash equivalents                 5,471 (57)
Cash and cash equivalents, beginning of period       $ 419       $ 476 419 476
Cash and cash equivalents, end of period $ 5,890       $ 419       $ 5,890 $ 419