Regulatory Matters (Tables)

9 Months Ended

Sep. 30, 2019

Regulated Operations [Abstract]

Summary of Company and Bank Continue to Exceed Regulatory Capital Minimum Requirements and Bank Continues to Exceed Well Capitalized Standards

As defined in applicable regulations and set forth in the tables below, RBB and the Bank continue to exceed the regulatory capital minimum requirements and the Bank continues to exceed the "well capitalized" standards at the dates indicated:

						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 September 30, 2019:
Tier 1 Leverage Ratio
Consolidated	$	344,745		12.74	%	NA		NA			NA		NA
Bank		404,795		14.98	%	$	108,150		4.0	%	$	135,187		5.0	%
Common Equity Tier 1 Risk-    Based Capital Ratio
Consolidated		335,113		16.95	%	NA		NA			NA		NA
Bank		404,795		20.53	%		89,127		4.5	%		128,739		6.5	%
Tier 1 Risk-Based Capital Ratio
Consolidated		344,745		17.44	%	NA		NA			NA		NA
Bank		404,795		20.53	%		118,836		6.0	%		158,448		8.0	%
Total Risk-Based Capital    Ratio
Consolidated		468,714		23.71	%	NA		NA			NA		NA
Bank		424,800		21.54	%		158,448		8.0	%		198,061		10.0	%

						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	%