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Note 6 - Loan Servicing - Schedule of Principal Balances of Mortgage and SBA Loans Serviced for Others (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Mortgages [Member]
Loans serviced for others	$ 1,569,407	$ 1,683,298
Small Business Administration Loans [Member]
Loans serviced for others	153,382	170,849
Commerical Real Estate Loans [Member]
Loans serviced for others	$ 4,164	$ 4,216

X

- Definition

Represent amount of loans serviced for others.

+ References

No definition available.

+ Details

Name:	rbb_LoansServicedForOthers
Namespace Prefix:	rbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_MortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=rbb_SmallBusinessAdministrationLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=rbb_CommericalRealEstateLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: