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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

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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: |

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