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Parent Only Condensed Financial Information - Schedule of Parent Only Condensed Statements of Financial Condition (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and cash equivalents | $ 114,763 | $ 147,685 |  |
Total assets | 2,788,535 | 2,974,002 |  |
Liabilities and Shareholders’ Equity |  |  |  |
Reserve for unfunded commitments | 826 | 688 |  |
Long term debt | 104,049 | 103,708 |  |
Accrued interest and other liabilities | 17,359 | 21,938 |  |
Total liabilities | 2,380,845 | 2,599,381 |  |
Shareholders' equity: |  |  |  |
Common stock | 290,395 | 288,610 |  |
Additional paid-in capital | 4,938 | 5,659 |  |
Retained earnings | 112,046 | 81,618 |  |
Non-controlling interest | 72 | 72 |  |
Accumulated other comprehensive income (loss) | 239 | (1,338) |  |
Total shareholders’ equity | 407,690 | 374,621 | $ 265,176 | $ 181,585
Total liabilities and shareholders’ equity | 2,788,535 | 2,974,002 |  |
RBB Bancorp |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 29,985 | 45,540 |  |
Other assets | 4,202 | 2,820 |  |
Total assets | 521,760 | 488,179 |  |
Liabilities and Shareholders’ Equity |  |  |  |
Long term debt | 104,049 | 103,708 |  |
Subordinated debentures | 9,673 | 9,506 |  |
Other liabilities | 348 | 344 |  |
Total liabilities | 114,070 | 113,558 |  |
Shareholders' equity: |  |  |  |
Common stock | 290,395 | 288,610 |  |
Additional paid-in capital | 4,938 | 5,659 |  |
Retained earnings | 112,046 | 81,618 |  |
Non-controlling interest | 72 | 72 |  |
Accumulated other comprehensive income (loss) | 239 | (1,338) |  |
Total shareholders’ equity | 407,690 | 374,621 |  |
Total liabilities and shareholders’ equity | 521,760 | 488,179 |  |
RBB Bancorp | Royal Business Bank |  |  |  |
Assets |  |  |  |
Investment | 480,703 | 433,023 |  |
RBB Bancorp | Royal Asset Management |  |  |  |
Assets |  |  |  |
Investment | $ 6,870 | $ 6,796 |  |

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