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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |
Net income | $ 1,045 | $ 411 | $ 404 | $ 847 | $ 1,209 | $ 1,118 | $ 1,005 | $ 1,234 | $ 2,707 | $ 4,566
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 6,094 | 11,315
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |
Dividends paid |  |  |  |  |  |  |  |  | (740) | (562)
Treasury stock repurchases |  |  |  |  |  |  |  |  | (452) | (1,478)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 97,350 | (13,605)
Net increase in cash and cash equivalents |  |  |  |  |  |  |  |  | 37,385 | 7,431
Cash and cash equivalents, beginning of period |  |  |  | 57,030 |  |  |  | 49,599 | 57,030 | 49,599
Cash and cash equivalents, end of period | 94,415 |  |  |  | 57,030 |  |  |  | 94,415 | 57,030
FUSB [Member] |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 2,707 | 4,566
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |
Distributions in excess of undistributed income of subsidiaries |  |  |  |  |  |  |  |  | (1,586) | (2,385)
Change in other assets and liabilities |  |  |  |  |  |  |  |  | 14 | 69
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 1,135 | 2,250
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |
Dividends paid |  |  |  |  |  |  |  |  | (740) | (561)
Treasury stock repurchases |  |  |  |  |  |  |  |  | (452) | (1,478)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (1,192) | (2,039)
Net increase in cash and cash equivalents |  |  |  |  |  |  |  |  | (57) | 211
Cash and cash equivalents, beginning of period |  |  |  | $ 476 |  |  |  | $ 265 | 476 | 265
Cash and cash equivalents, end of period | $ 419 |  |  |  | $ 476 |  |  |  | $ 419 | $ 476

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