Regulatory Matters (Tables)

12 Months Ended

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	%