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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2019
Banking And Thrift [Abstract] |
Summary of Actual Capital Amounts and Ratios and Related Regulatory Requirements | The following table sets forth RBB Bancorp's consolidated and the Bank's actual capital amounts and ratios and related regulatory requirements for the Bank as of December 31, 2019:
|  |  |  |  |  |  |  |  |  | Amount of Capital Required |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | To Be Well-Capitalized |
|  |  |  |  |  |  |  |  |  | Minimum Required for |  |  | Under Prompt Corrective |
|  | Actual |  |  | Capital Adequacy Purposes |  |  | Provisions |
(dollars in thousands) |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
As of December 31, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 Leverage Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 353,572 |  |  |  | 12.89 | % |  | NA |  |  | NA |  |  | NA |  |  | NA |
Bank |  |  | 417,036 |  |  |  | 15.23 | % |  | $ | 108,150 |  |  |  | 4.0 | % |  | $ | 135,187 |  |  |  | 5.0 | %
Common Equity Tier 1 Risk-Based Capital Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 343,899 |  |  |  | 17.16 | % |  | NA |  |  | NA |  |  | NA |  |  | NA |
Bank |  |  | 417,036 |  |  |  | 20.87 | % |  |  | 89,127 |  |  |  | 4.5 | % |  |  | 128,739 |  |  |  | 6.5 | %
Tier 1 Risk-Based Capital Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 353,572 |  |  |  | 17.65 | % |  | NA |  |  | NA |  |  | NA |  |  | NA |
Bank |  |  | 417,036 |  |  |  | 20.87 | % |  |  | 118,836 |  |  |  | 6.0 | % |  |  | 158,448 |  |  |  | 8.0 | %
Total Risk-Based Capital Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 477,262 |  |  |  | 23.82 | % |  | NA |  |  | NA |  |  | NA |  |  | NA |
Bank |  |  | 436,677 |  |  |  | 21.86 | % |  |  | 158,448 |  |  |  | 8.0 | % |  |  | 198,061 |  |  |  | 10.0 | %
The following table sets forth RBB Bancorp's consolidated and the Bank's actual capital amounts and ratios and related regulatory requirements for the Bank as of December 31, 2018:
|  |  |  |  |  |  |  |  |  | Amount of Capital Required |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | To Be Well-Capitalized |
|  |  |  |  |  |  |  |  |  | Minimum Required for |  |  | Under Prompt Corrective |
|  | Actual |  |  | Capital Adequacy Purposes |  |  | Provisions |
(dollars in thousands) |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |  |  | Amount |  |  | Ratio |
As of December 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 Leverage Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 321,407 |  |  |  | 11.80 | % |  | NA |  |  | NA |  |  | NA |  |  | NA |
Bank |  |  | 370,304 |  |  |  | 13.66 | % |  | $ | 108,445 |  |  |  | 4.0 | % |  | $ | 135,556 |  |  |  | 5.0 | %
Common Equity Tier 1 Risk Based Capital Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 311,901 |  |  |  | 15.28 | % |  | NA |  |  | NA |  |  | NA |  |  | NA |
Bank |  |  | 370,304 |  |  |  | 18.17 | % |  | $ | 91,722 |  |  |  | 4.5 | % |  | $ | 132,487 |  |  |  | 6.5 | %
Tier 1 Risk-Based Capital Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 321,407 |  |  |  | 15.74 | % |  | NA |  |  | NA |  |  | NA |  |  | NA |
Bank |  |  | 370,304 |  |  |  | 18.17 | % |  |  | 122,296 |  |  |  | 6.0 | % |  | $ | 163,061 |  |  |  | 8.0 | %
Total Risk-Based Capital Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 443,379 |  |  |  | 21.71 | % |  | NA |  |  | NA |  |  | NA |  |  | NA |
Bank |  |  | 388,569 |  |  |  | 19.07 | % |  | $ | 163,061 |  |  |  | 8.0 | % |  | $ | 203,826 |  |  |  | 10.0 | %

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