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Note 6 - Loan Servicing (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Servicing Asset, Total	$ 14,724,000		$ 14,724,000		$ 17,083,000
Loan Servicing Fees Net of Amortization	546,000	$ 827,000	1,846,000	$ 2,566,000
Mortgages [Member]
Servicing Asset, Total	11,200,000		11,200,000		15,100,000
Servicing Asset Impairment Write Down	416,000		416,000
SBA Loans [Member]
Servicing Asset, Total	$ 5,000,000.0		$ 5,000,000.0		$ 5,600,000

X

- Definition

The amount of loan servicing fees net of amortization.

+ References

No definition available.

+ Details

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

X

- Definition

Represents amount of write down for impairment of servicing asset.

+ References

No definition available.

+ Details

Name:	rbb_ServicingAssetImpairmentWriteDown
Namespace Prefix:	rbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

+ Details

Name:	us-gaap_ServicingAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_MortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=rbb_SbaLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: