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Parent Only Condensed Financial Information - Schedule of Parent Only Condensed Statements of Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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 | Dec. 31, 2017
Consolidated Statements of Income and Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 33,907 | $ 34,669 | $ 35,943 | $ 37,206 | $ 35,181 | $ 24,473 | $ 22,284 | $ 20,177 | $ 141,725 | $ 102,115 | $ 74,104
Interest expense | 10,784 | 11,157 | 11,626 | 11,294 | 9,599 | 5,857 | 4,457 | 3,732 | 44,861 | 23,645 | 13,938
Noninterest expense | 13,463 | 13,786 | 14,899 | 15,325 | 15,503 | 8,654 | 8,191 | 8,289 | 57,473 | 40,637 | 27,623
Income before income taxes | 14,824 | 11,701 | 14,557 | 14,239 | 13,678 | 10,372 | 11,729 | 10,427 | 55,321 | 46,206 | 46,797
Income tax benefit | (4,149) | (3,689) | (4,415) | (3,859) | (4,188) | (2,041) | (2,292) | (1,580) | (16,112) | (10,101) | (21,269)
Net income | $ 10,675 | $ 8,012 | $ 10,142 | $ 10,380 | $ 9,490 | $ 8,331 | $ 9,437 | $ 8,847 | 39,209 | 36,105 | 25,528
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | 1,577 | (895) | (104)
Total comprehensive income |  |  |  |  |  |  |  |  | 40,786 | 35,210 | 25,424
RBB Bancorp |  |  |  |  |  |  |  |  |  |  |
Consolidated Statements of Income and Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  |  | 15 |
Interest expense |  |  |  |  |  |  |  |  | 7,697 | 4,083 | 3,629
Noninterest expense |  |  |  |  |  |  |  |  | 1,300 | 1,255 | 642
Loss before equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | (8,997) | (5,323) | (4,271)
Income before income taxes |  |  |  |  |  |  |  |  | 36,401 | 34,403 | 23,492
Income tax benefit |  |  |  |  |  |  |  |  | 2,808 | 1,702 | 2,036
Net income |  |  |  |  |  |  |  |  | 39,209 | 36,105 | 25,528
Other comprehensive income (loss) |  |  |  |  |  |  |  |  | 1,577 | (895) | (104)
Total comprehensive income |  |  |  |  |  |  |  |  | 40,786 | 35,210 | 25,424
RBB Bancorp | Royal Business Bank |  |  |  |  |  |  |  |  |  |  |
Consolidated Statements of Income and Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed income |  |  |  |  |  |  |  |  | 45,324 | 39,198 | 27,620
RBB Bancorp | Royal Asset Management |  |  |  |  |  |  |  |  |  |  |
Consolidated Statements of Income and Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Equity in undistributed income |  |  |  |  |  |  |  |  | $ 74 | $ 528 | $ 143

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