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Regulatory Matters - Summary of Actual Capital Amounts and Ratios and Related Regulatory Requirements (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Jan. 01, 2015
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Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |
Tier 1 Risk-Based Capital Ratio, Amount | $ 227,104 | $ 178,645 |
Tier 1 Risk-Based Capital Ratio, Ratio | 18.13% | 15.81% |
Tier 1 Risk-Based Capital Ratio, For Capital Adequacy Purposes Amount | $ 75,169 | $ 67,813 |
Tier 1 Risk-Based Capital Ratio, For Capital Adequacy Purposes Ratio | 6.00% | 6.00% | 4.00%
Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount | $ 100,225 | $ 90,417 |
Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Ratio | 8.00% | 8.00% | 6.00%
Total Risk-Based Capital Ratio, Amount | $ 239,013 | $ 192,784 |
Total Risk-Based Capital Ratio, Ratio | 19.08% | 17.06% |
Total Risk-Based Capital Ratio, For Capital Adequacy Purposes Amount | $ 100,225 | $ 90,417 |
Total Risk-Based Capital Ratio, For Capital Adequacy Purposes Ratio | 8.00% | 8.00% |
Total Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount | $ 125,282 | $ 113,021 |
Total Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Ratio | 10.00% | 10.00% |
RBB Bancorp |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |
Tier 1 Leverage Ratio, Amount | $ 232,521 | $ 153,682 |
Tier 1 Leverage Ratio, Ratio | 14.91% | 11.00% |
Common Equity Tier 1 Risk-Based Capital Ratio, Amount | $ 229,244 | $ 150,786 |
Common Equity Tier 1 Risk-Based Capital Ratio, Ratio | 18.23% | 13.30% |
Tier 1 Risk-Based Capital Ratio, Amount | $ 232,521 | $ 153,682 |
Tier 1 Risk-Based Capital Ratio, Ratio | 18.49% | 13.56% |
Total Risk-Based Capital Ratio, Amount | $ 293,922 | $ 217,244 |
Total Risk-Based Capital Ratio, Ratio | 23.37% | 19.17% |
Royal Business Bank |  |  |
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items] |  |  |
Tier 1 Leverage Ratio, Amount | $ 227,104 | $ 178,645 |
Tier 1 Leverage Ratio, Ratio | 14.57% | 12.81% |
Tier 1 Leverage Ratio, For Capital Adequacy Purposes Amount | $ 62,363 | $ 55,777 |
Tier 1 Leverage Ratio, For Capital Adequacy Purposes Ratio | 4.00% | 4.00% |
Tier 1 Leverage Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount | $ 77,953 | $ 69,722 |
Tier 1 Leverage Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Ratio | 5.00% | 5.00% |
Common Equity Tier 1 Risk-Based Capital Ratio, Amount | $ 227,104 | $ 178,645 |
Common Equity Tier 1 Risk-Based Capital Ratio, Ratio | 18.13% | 15.81% |
Common Equity Tier 1 Risk-Based Capital Ratio, For Capital Adequacy Purposes Amount | $ 56,377 | $ 50,860 |
Common Equity Tier 1 Risk-Based Capital Ratio, For Capital Adequacy Purposes Ratio | 4.50% | 4.50% |
Common Equity Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount | $ 81,433 | $ 73,464 |
Common Equity Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Ratio | 6.50% | 6.50% |

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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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