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Note 16 - 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
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2015
Banking Regulation, Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum     0.040
Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Ratio     0.060
RBB Bancorp [Member]      
Tier 1 Leverage Ratio, Amount $ 361,290 $ 353,572  
Tier 1 Leverage Ratio, Ratio 11.47 0.1289  
Tier 1 Leverage Ratio, Minimum Required for Capital Adequacy Purposes Amount $ 125,998 $ 109,735  
Tier 1 Leverage Ratio, Minimum Required for Capital Adequacy Purposes Ratio 4.0 0.040  
Tier 1 Leverage Ratio, Minimum Required Plus Capital Conservation Buffer Fully Phased-In Amount $ 125,998 $ 109,735  
Tier 1 Leverage Ratio, Minimum Required Plus Capital Conservation Buffer Fully Phased-In Ratio 4.00% 4.00%  
Tier 1 Leverage Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount $ 157,497 $ 137,169  
Tier 1 Leverage Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Ratio 5.0 0.050  
Common Equity Tier 1 Risk-Based Capital Ratio, Amount $ 347,061 $ 343,899  
Common Equity Tier 1 Risk-Based Capital Ratio, Ratio 14.11 0.1716  
Common Equity Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount $ 110,704 $ 90,165  
Common Equity Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Ratio 4.50% 4.50%  
Common Equity Tier 1 Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Amount $ 172,207 $ 140,256  
Common Equity Tier 1 Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Ratio 0.070 0.070  
Common Equity Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount $ 159,906 $ 130,238  
Common Equity Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Ratio 6.50% 6.50%  
Tier 1 Risk-Based Capital Ratio, Amount $ 361,290 $ 353,572  
Tier 1 Risk-Based Capital Ratio, Ratio 14.69 0.1765  
Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount $ 147,606 $ 120,219  
Banking Regulation, Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum 6.0 0.060  
Tier 1 Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Amount $ 209,108 $ 170,311  
Tier 1 Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Ratio 8.50% 8.50%  
Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount $ 196,808 $ 160,292  
Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Ratio 8.0 0.080  
Total Risk-Based Capital Ratio, Amount $ 493,358 $ 477,262  
Total Risk-Based Capital Ratio, Ratio 20.05 0.2382  
Total Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount $ 196,808 $ 160,292  
Total Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Ratio 8.0 0.080  
Total Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Amount $ 258,310 $ 210,384  
Total Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Ratio 10.50% 10.50%  
Total Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount $ 246,010 $ 200,366  
Total Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Ratio 10.0 0.100  
Royal Business Bank [Member]      
Tier 1 Leverage Ratio, Amount $ 445,699 $ 417,036  
Tier 1 Leverage Ratio, Ratio 14.16 0.1523  
Tier 1 Leverage Ratio, Minimum Required for Capital Adequacy Purposes Amount $ 125,929 $ 108,150  
Tier 1 Leverage Ratio, Minimum Required for Capital Adequacy Purposes Ratio 4.0 0.040  
Tier 1 Leverage Ratio, Minimum Required Plus Capital Conservation Buffer Fully Phased-In Amount $ 125,929 $ 108,150  
Tier 1 Leverage Ratio, Minimum Required Plus Capital Conservation Buffer Fully Phased-In Ratio 4.00% 4.00%  
Tier 1 Leverage Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount $ 157,411 $ 135,187  
Tier 1 Leverage Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Ratio 5.0 0.050  
Common Equity Tier 1 Risk-Based Capital Ratio, Amount $ 445,699 $ 417,036  
Common Equity Tier 1 Risk-Based Capital Ratio, Ratio 18.13 0.2087  
Common Equity Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount $ 110,432 $ 89,127  
Common Equity Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Ratio 4.50% 4.50%  
Common Equity Tier 1 Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Amount $ 171,783 $ 138,642  
Common Equity Tier 1 Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Ratio 7.0 0.070  
Common Equity Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount $ 159,513 $ 128,739  
Common Equity Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Ratio 6.50% 6.50%  
Tier 1 Risk-Based Capital Ratio, Amount $ 445,699 $ 417,036  
Tier 1 Risk-Based Capital Ratio, Ratio 18.13 0.2087  
Tier 1 Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount $ 147,242 $ 118,836  
Banking Regulation, Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum 6.0 0.060  
Tier 1 Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Amount $ 208,593 $ 168,351  
Tier 1 Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Ratio 8.50% 8.50%  
Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount $ 196,323 $ 158,448  
Tier 1 Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Ratio 8.0 0.080  
Total Risk-Based Capital Ratio, Amount $ 473,462 $ 436,677  
Total Risk-Based Capital Ratio, Ratio 19.26 0.2186  
Total Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Amount $ 196,323 $ 158,448  
Total Risk-Based Capital Ratio, Minimum Required for Capital Adequacy Purposes Ratio 8.0 0.080  
Total Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Amount $ 257,674 $ 207,964  
Total Risk-Based Capital Ratio, Minimum Required Plus Capital Conversation Buffer Fully Phased-In, Ratio 10.50% 10.50%  
Total Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Amount $ 245,404 $ 198,061  
Total Risk-Based Capital Ratio, To Be Well-Capitalized Under Prompt Corrective Provisions Ratio 10.0 0.100