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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

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- 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

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

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

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

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |