XML 116 R102.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Note 18 - Fair Value Measurements and Fair Value of Financial Instruments - Schedule of Major Category of Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Recurring [Member] |  |
Assets measured at fair value | $ 319,007 | $ 256,848
Fair Value, Recurring [Member] | Forward Mortgage Loan Sale Contracts [Member] |  |
Assets measured at fair value | 14 | 18
Fair Value, Recurring [Member] | Interest Rate Lock Contracts [Member] |  |
Assets measured at fair value | 32 |
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |
Assets measured at fair value | 8,161 | 4,495
Fair Value, Recurring [Member] | Small Business Administration Agency Securities [Member] |  |
Assets measured at fair value | 13,217 | 2,411
Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Assets measured at fair value | 34,652 | 42,928
Fair Value, Recurring [Member] | Collateralized Mortgage Obligations [Member] |  |
Assets measured at fair value | 149,626 | 111,593
Fair Value, Recurring [Member] | Commercial Paper [Member] |  |
Assets measured at fair value | 73,105 | 49,537
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Assets measured at fair value | 30,691 | 37,012
Fair Value, Recurring [Member] | Municipal Securities [Member] |  |
Assets measured at fair value | 9,509 | 8,854
Fair Value, Nonrecurring [Member] |  |
Assets measured at fair value | 11,357 |
Fair Value, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Assets measured at fair value | 10,209 |
Fair Value, Nonrecurring [Member] | SBA Loans [Member] |  |
Assets measured at fair value | 1,148 |
Fair Value, Nonrecurring [Member] | Other Real Estate Owned [Member] |  |
Assets measured at fair value |  | 577
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Forward Mortgage Loan Sale Contracts [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Interest Rate Lock Contracts [Member] |  |
Assets measured at fair value |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Small Business Administration Agency Securities [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage Obligations [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Commercial Paper [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Municipal Securities [Member] |  |
Assets measured at fair value |  | 0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |
Assets measured at fair value | 0 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Assets measured at fair value | 0 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | SBA Loans [Member] |  |
Assets measured at fair value | 0 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Other Real Estate Owned [Member] |  |
Assets measured at fair value |  | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |
Assets measured at fair value | 318,961 | 256,830
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Forward Mortgage Loan Sale Contracts [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Interest Rate Lock Contracts [Member] |  |
Assets measured at fair value |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |
Assets measured at fair value | 8,161 | 4,495
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Small Business Administration Agency Securities [Member] |  |
Assets measured at fair value | 13,217 | 2,411
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Assets measured at fair value | 34,652 | 42,928
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage Obligations [Member] |  |
Assets measured at fair value | 149,626 | 111,593
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Commercial Paper [Member] |  |
Assets measured at fair value | 73,105 | 49,537
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Assets measured at fair value | 30,691 | 37,012
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Municipal Securities [Member] |  |
Assets measured at fair value | 9,509 | 8,854
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |
Assets measured at fair value | 0 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Assets measured at fair value | 0 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | SBA Loans [Member] |  |
Assets measured at fair value | 0 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Other Real Estate Owned [Member] |  |
Assets measured at fair value |  | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] |  |
Assets measured at fair value | 46 | 18
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Forward Mortgage Loan Sale Contracts [Member] |  |
Assets measured at fair value | 14 | 18
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Interest Rate Lock Contracts [Member] |  |
Assets measured at fair value | 32 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Small Business Administration Agency Securities [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Collateralized Mortgage Obligations [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Commercial Paper [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Assets measured at fair value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Municipal Securities [Member] |  |
Assets measured at fair value |  | 0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |
Assets measured at fair value | 11,357 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Assets measured at fair value | 10,209 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | SBA Loans [Member] |  |
Assets measured at fair value | $ 1,148 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Other Real Estate Owned [Member] |  |
Assets measured at fair value |  | $ 577

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=rbb_ForwardMortgageLoanSaleContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=rbb_InterestRateLockContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=rbb_SmallBusinessAdministrationAgencySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_CollateralizedMortgageObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_CommercialPaperMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=rbb_MunicipalSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=rbb_SBALoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=rbb_OtherRealEstateOwnedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |