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Note 13 - Commitments - Schedule of Financial Commitments Represents Credit Risk (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financial commitments, contractual amount	$ 451,521	$ 330,199
Standby Letters of Credit [Member]
Financial commitments, contractual amount	4,114	3,715
Commitments to Extend Credit [Member]
Financial commitments, contractual amount	447,111	326,126
Commercial And Similar Letters Of Credit [Member]
Financial commitments, contractual amount	$ 296	$ 358

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- Definition

The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=rbb_CommercialAndSimilarLettersOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: