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Note 6 - Premises and Equipment (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Depreciation and Leasehold Amortization, Excluding Intangibles Amortization | $ 1,900,000 | $ 2,000,000 | $ 2,000,000
Gain (Loss) on Disposition of Property Plant Equipment | $ 0 | $ 32,000 | $ 757,000

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- Definition The amount of depreciation and leasehold amortization, excluding intangibles amortization. + References No definition available. + Details
Name: | rbb_DepreciationAndLeaseholdAmortizationExcludingIntangiblesAmortization
Namespace Prefix: | rbb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
Name: | us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration