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Note 17 - Regulatory Matters - Summary of Company and Bank Continue to Exceed Regulatory Capital Minimum Requirements and Bank Continues to Exceed Well Capitalized Standards (Details) $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jan. 01, 2015
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Banking Regulation, Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum |  |  |  | 0.04
RBB Bancorp [Member] |  |  |  |
Tier 1 Leverage Ratio, Amount |  | $ 472,152 | $ 446,776 |
Tier 1 Leverage Ratio, Ratio |  | 0.1199 | 0.1167 |
Tier 1 Leverage Ratio, Minimum Required for Capital Adequacy Purposes Amount |  | $ 157,526 | $ 153,116 |
Tier 1 Leverage Ratio, Minimum Required for Capital Adequacy Purposes Ratio | [1] | 0.04 | 0.04 |
Tier 1 Leverage Ratio, Minimum Required Plus Capital Conservation Buffer Fully Phased-In Amount |  | $ 196,907 | $ 191,395 |
Tier 1 Leverage Ratio, Minimum Required Plus Capital Conservation Buffer Fully Phased-In Ratio |  |  | 5.00% |
Common Equity Tier 1 Risk-Based Capital Ratio, Amount |  | $ 457,214 | $ 432,056 |
Common Equity Tier 1 Risk-Based Capital Ratio, Ratio |  | 0.1907 | 0.1603 |
Common Equity Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount |  | $ 107,886 | $ 121,291 |
Common Equity Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Ratio | [1] | 4.50% | 4.50% |
Common Equity Tier 1 Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Amount |  | $ 155,836 | $ 175,199 |
Common Equity Tier 1 Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Ratio |  | 0.065 | 0.065 |
Tier 1 Risk-Based Capital Ratio, Amount |  | $ 472,152 | $ 446,776 |
Tier 1 Risk-Based Capital Ratio, Ratio |  | 0.1969 | 0.1658 |
Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount |  | $ 143,849 | $ 161,722 |
Banking Regulation, Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum | [1] | 0.06 | 0.06 |
Tier 1 Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Amount |  | $ 191,798 | $ 215,629 |
Tier 1 Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Ratio |  | 8.00% | 8.00% |
Total Risk-Based Capital Ratio, Amount |  | $ 621,423 | $ 654,159 |
Total Risk-Based Capital Ratio, Ratio |  | 0.2592 | 0.2427 |
Total Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount |  | $ 191,798 | $ 215,629 |
Total Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Ratio | [1] | 0.08 | 0.08 |
Total Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Amount |  | $ 239,748 | $ 269,537 |
Total Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Ratio |  | 10.00% | 10.00% |
Royal Business Bank [Member] |  |  |  |
Tier 1 Leverage Ratio, Amount |  | $ 535,952 | $ 569,071 |
Tier 1 Leverage Ratio, Ratio |  | 0.1362 | 0.1489 |
Tier 1 Leverage Ratio, Minimum Required for Capital Adequacy Purposes Amount |  | $ 157,454 | $ 152,900 |
Tier 1 Leverage Ratio, Minimum Required for Capital Adequacy Purposes Ratio | [1] | 0.04 | 0.04 |
Tier 1 Leverage Ratio, Minimum Required Plus Capital Conservation Buffer Fully Phased-In Amount |  | $ 196,818 | $ 191,124 |
Tier 1 Leverage Ratio, Minimum Required Plus Capital Conservation Buffer Fully Phased-In Ratio |  | 5.00% | 5.00% |
Common Equity Tier 1 Risk-Based Capital Ratio, Amount |  | $ 535,952 | $ 569,071 |
Common Equity Tier 1 Risk-Based Capital Ratio, Ratio |  | 0.2241 | 0.2114 |
Common Equity Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount |  | $ 107,598 | $ 121,110 |
Common Equity Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Ratio | [1] | 4.50% | 4.50% |
Common Equity Tier 1 Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Amount |  | $ 155,419 | $ 174,937 |
Common Equity Tier 1 Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Ratio |  | 0.065 | 0.065 |
Tier 1 Risk-Based Capital Ratio, Amount |  | $ 535,952 | $ 569,071 |
Tier 1 Risk-Based Capital Ratio, Ratio |  | 0.2241 | 0.2114 |
Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount |  | $ 143,464 | $ 161,481 |
Banking Regulation, Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum | [1] | 0.06 | 0.06 |
Tier 1 Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Amount |  | $ 191,285 | $ 215,307 |
Tier 1 Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Ratio |  | 8.00% | 8.00% |
Total Risk-Based Capital Ratio, Amount |  | $ 565,997 | $ 602,819 |
Total Risk-Based Capital Ratio, Ratio |  | 0.2367 | 0.224 |
Total Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount |  | $ 191,285 | $ 215,307 |
Total Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Ratio | [1] | 0.08 | 0.08 |
Total Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Amount |  | $ 239,106 | $ 269,134 |
Total Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Ratio |  | 10.00% | 10.00% |
[1] | These ratios are exclusive of the capital conservation buffer.

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