XML 115 R101.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Note 18 - Fair Value Measurements and Fair Value of Financial Instruments (Details Textual) |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 10, 2023 USD ($) | Sep. 01, 2023 USD ($) | Dec. 31, 2023 USD ($) $ / item | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Financing Receivables, Collateral Dependent, Write-down |  |  | $ 521,000 |  |
Other Real Estate, Disposals | $ 284,000 | $ 293,000 |  |  |
Gains (Losses) on Sales of Other Real Estate | $ (57,000) | $ 190,000 | 134,000 | $ (0) | $ (0)
Write Down on Other Real Estate Owned |  |  | $ 0 | 0 |
Minimum [Member] | Interest Rate Lock Contracts and Forward Mortgage Loan Sale Contracts [Member] |  |  |  |  |
Derivative, Buy Price (in USD per Per Share) | $ / item |  |  | 99.5 |  |
Derivative, Sale Price (in USD per Per Share) | $ / item |  |  | 102 |  |
Maximum [Member] | Interest Rate Lock Contracts and Forward Mortgage Loan Sale Contracts [Member] |  |  |  |  |
Derivative, Buy Price (in USD per Per Share) | $ / item |  |  | 100.3 |  |
Derivative, Sale Price (in USD per Per Share) | $ / item |  |  | 104 |  |
Single-Family Residences [Member] |  |  |  |  |
Assets, Fair Value Disclosure |  |  | $ 0 | $ 577,000 |
Measurement Input, Selling Costs [Member] |  |  |  |  |
Collateral Dependent Loans, Measurement Input |  |  | 0.10 |  |
Measurement Input, Comparability Adjustment [Member] | Other Real Estate Owned [Member] | Minimum [Member] |  |  |  |  |
Alternative Investment, Measurement Input |  |  | 0.05 |  |
Measurement Input, Comparability Adjustment [Member] | Other Real Estate Owned [Member] | Maximum [Member] |  |  |  |  |
Alternative Investment, Measurement Input |  |  | 0.06 |  |
Measurement Input, Margin Cost Rate [Member] | Minimum [Member] | Interest Rate Lock Contracts and Forward Mortgage Loan Sale Contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Derivative Asset, Measurement Input |  |  | 0.005 |  |
Measurement Input, Margin Cost Rate [Member] | Maximum [Member] | Interest Rate Lock Contracts and Forward Mortgage Loan Sale Contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Derivative Asset, Measurement Input |  |  | 1 |  |
Collateral Pledged [Member] |  |  |  |  |
Loans Receivable, Fair Value Disclosure |  |  | $ 11,400,000 |  |

X
- Definition Value of input used to measure collateral dependent loans. + References No definition available. + Details
Name: | rbb_CollateralDependentLoansMeasurementInput
Namespace Prefix: | rbb_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The buy price on derivative. + References No definition available. + Details
Name: | rbb_DerivativeBuyPrice
Namespace Prefix: | rbb_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Definition The sale price of derivative. + References No definition available. + Details
Name: | rbb_DerivativeSalePrice
Namespace Prefix: | rbb_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of write-down related to collateral dependent loans. + References No definition available. + Details
Name: | rbb_FinancingReceivablesCollateralDependentWritedown
Namespace Prefix: | rbb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents write down on other real estate owned. + References No definition available. + Details
Name: | rbb_WriteDownOnOtherRealEstateOwned
Namespace Prefix: | rbb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Value of input used to measure alternative investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_AlternativeInvestmentMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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
- Definition Value of input used to measure derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_DerivativeAssetMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 + Details
Name: | us-gaap_GainsLossesOnSalesOfOtherRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Publisher FASB -URI https://asc.fasb.org//310-10/tableOfContent + Details
Name: | us-gaap_LoansReceivableFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Disposals of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This excludes real estate assets taken in settlement of troubled loans through surrender or foreclosure. + References No definition available. + Details
Name: | us-gaap_OtherRealEstateDisposals
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=rbb_SinglefamilyResidencesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=rbb_MeasurementInputSellingCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputComparabilityAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=rbb_MeasurementInputMarginCostRateMember
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: |

X
- Details
Name: | us-gaap_CollateralAxis=us-gaap_CollateralPledgedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |