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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
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.