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Note 8 - Deposits (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Time Deposits | $ 405,600 |
Brokered Time Deposits | 254,900 | $ 255,000
Collateralized Deposits From the State of California [Member] |  |
Time Deposits | 80,000 | 0
Time Deposits Acquired Through Internet Listing Services [Member] |  |
Time Deposits | 61,400 | 10,700
Certificates of Deposit Held Through CDARS [Member] |  |
Time Deposits | $ 135,700 | $ 17,700

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- Definition Amount of 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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- Definition Amount of time deposit liabilities, including certificates of deposit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 405 -Topic 942 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481047/942-405-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_TimeDeposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_FinancialInstrumentAxis=rbb_CollateralizedDepositsFromTheStateOfCaliforniaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=rbb_TimeDepositsAcquiredThroughInternetListingServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=rbb_CertificatesOfDepositHeldThroughCdarsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |