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Parent Only Condensed Financial Information - Schedule of Parent Only Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |  |
Net income | $ 39,209 | $ 36,105 | $ 25,528
Net cash provided by (used in) operating activities | 476,468 | (84,648) | 28,783
Cash flows from investment activities: |  |  |
Net cash acquired (outlay) in connection with acquisition |  | 25,073 |
Net cash used in investing activities | (219,353) | (322,390) | (264,446)
Cash flows from financing activities: |  |  |
Issuance of subordinated debentures, net of issuance costs |  | 54,018 |
Issuance of common stock, net of issuance costs |  |  | 60,210
Dividends paid | (8,033) | (5,753) | (5,118)
Common stock repurchased, net of repurchased costs | (3,190) |  |
Stock options exercised | 2,817 | 9,629 | 2,296
Net cash (used in) provided by financing activities | (223,037) | 404,675 | 266,998
Net increase (decrease) in cash and cash equivalents | 34,078 | (2,363) | 31,335
Cash and cash equivalents at beginning of period | 147,685 | 150,048 | 118,713
Cash and cash equivalents at end of period | 181,763 | 147,685 | 150,048
RBB Bancorp |  |  |
Cash flows from operating activities: |  |  |
Net income | 39,209 | 36,105 | 25,528
Net amortization of other | 508 | 268 | 235
Provision for deferred income taxes | 513 | (1,905) | 1,807
Undistributed income of subsidiaries | (45,398) | (39,726) | (27,763)
Change in other assets and liabilities | (1,981) | 3,492 | (3,923)
Net cash provided by (used in) operating activities | (7,149) | (1,766) | (4,116)
Cash flows from investment activities: |  |  |
Net cash acquired (outlay) in connection with acquisition |  | (41,358) |
Investment in subsidiaries |  | (15,000) | (25,000)
Net cash used in investing activities |  | (56,358) | (25,000)
Cash flows from financing activities: |  |  |
Issuance of subordinated debentures, net of issuance costs |  | 54,018 |
Issuance of common stock, net of issuance costs |  |  | 60,210
Dividends paid | (8,033) | (5,753) | (5,118)
Common stock repurchased, net of repurchased costs | (3,190) |  |
Stock options exercised | 2,817 | 9,630 | 2,296
Net cash (used in) provided by financing activities | (8,406) | 57,895 | 57,388
Net increase (decrease) in cash and cash equivalents | (15,555) | (229) | 28,272
Cash and cash equivalents at beginning of period | 45,540 | 45,769 | 17,497
Cash and cash equivalents at end of period | $ 29,985 | $ 45,540 | $ 45,769

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