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Deposits - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Maturities Of Time Deposits [Abstract]
Brokered time deposits	$ 67.1	$ 113.8

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- Definition

Brokered time deposits.

+ References

No definition available.

+ Details

Name:	rbb_BrokeredTimeDeposits
Namespace Prefix:	rbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_MaturitiesOfTimeDepositsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration