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Note 6 - Loan Servicing - Schedule of Principal Balances of Mortgage and SBA Loans Serviced for Others (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Mortgages [Member]
Loans serviced for others	$ 1,014,017	$ 1,127,668
Small Business Administration Loans [Member]
Loans serviced for others	100,336	119,893
Commerical Real Estate Loans [Member]
Loans serviced for others	3,813	3,991
Construction Loans [Member]
Loans serviced for others	$ 4,710	$ 3,677

X

- Definition

Represent amount of loans serviced for others.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
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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:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: