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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

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