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Note 6 - Loan Servicing (Details Textual)	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Loan Servicing Fees Net of Amortization	$ 2,576,000	$ 2,209,000	$ 684,000
Servicing Asset, Custodial Balance	6,400,000	7,000,000
Servicing Asset at Amortized Cost, Recovery on Impairments			$ 417,000
Servicing Asset	8,110,000	9,521,000
Mortgages [Member]
Servicing Asset	$ 12,100,000	$ 18,300,000
Mortgages [Member] | Measurement Input, Discount Rate [Member]
Servicing Asset, Measurement Input	0.1123	0.111
Mortgages [Member] | Measurement Input, Prepayment Rate [Member]
Servicing Asset, Measurement Input	0.0791	0.0773
Mortgages [Member] | Measurement Input, Default Rate [Member]
Servicing Asset, Measurement Input	0.001	0.001
Small Business Administration Loans [Member]
Servicing Asset	$ 2,800,000	$ 3,500,000
Small Business Administration Loans [Member] | Measurement Input, Discount Rate [Member]
Servicing Asset, Measurement Input	0.085	0.085
Small Business Administration Loans [Member] | Measurement Input, Prepayment Rate [Member]
Servicing Asset, Measurement Input	0.1768	0.1679
Small Business Administration Loans [Member] | Measurement Input, Default Rate [Member]
Servicing Asset, Measurement Input	0.0073	0.0037

X

- Definition

The amount of loan servicing fees net of amortization.

+ References

No definition available.

+ Details

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Namespace Prefix:	rbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of recovery on impairments of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

No definition available.

+ Details

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Namespace Prefix:	rbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Aggregate amount of servicing assets with custodial balances.

+ References

No definition available.

+ Details

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Namespace Prefix:	rbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 50
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481260/860-50-45-2

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Value of input used to measure servicing 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

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