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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:                    
Net income $ 1,209 $ 1,118 $ 1,005 $ 1,234 $ 1,477 $ 240 $ 359 $ 414 $ 4,566 $ 2,490
Adjustments to reconcile net income to net cash provided by operating activities:                    
Net cash provided by operating activities                 11,315 8,064
Cash flows from investing activities:                    
Net cash paid for acquisition                   (19,014)
Net cash provided by investing activities                 9,721 2,702
Cash flows from financing activities:                    
Dividends paid                 (562) (495)
Treasury stock repurchases                 (1,478)  
Net cash (used in) provided by financing activities                 (13,605) 11,709
Net increase in cash and cash equivalents                 7,431 22,475
Cash and cash equivalents, beginning of period       49,599       27,124 49,599 27,124
Cash and cash equivalents, end of period 57,030       49,599       57,030 49,599
FUSB [Member]                    
Cash flows from operating activities:                    
Net income                 4,566 2,490
Adjustments to reconcile net income to net cash provided by operating activities:                    
Distributions in excess of undistributed income of subsidiaries                 (2,385) (2,345)
Change in other assets and liabilities                 69 256
Net cash provided by operating activities                 2,250 401
Cash flows from investing activities:                    
Net cash paid for acquisition                   (22,099)
Net cash provided by investing activities                   (22,099)
Cash flows from financing activities:                    
Dividends paid                 (561) (495)
Dividends received                   22,099
Treasury stock repurchases                 (1,478)  
Net cash (used in) provided by financing activities                 (2,039) 21,604
Net increase in cash and cash equivalents                 211 (94)
Cash and cash equivalents, beginning of period       $ 265       $ 359 265 359
Cash and cash equivalents, end of period $ 476       $ 265       $ 476 $ 265