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Note 8 - Deposits (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deposits, Wholesale	$ 147,500	$ 405,600
Brokered Time Deposits	93,200	254,900
Time Deposits	1,857,743
Collateralized Deposits From the State of California [Member]
Time Deposits	20,000	80,000
Time Deposits Acquired Through Internet Listing Services [Member]
Time Deposits	34,200	61,400
Certificates of Deposit Held Through CDARS [Member]
Time Deposits	130,600	135,700
ICS [Member]
Time Deposits	$ 146,100	$ 109,200

X

- Definition

Amount of brokered time deposits.

+ References

No definition available.

+ Details

Name:	rbb_BrokeredTimeDeposits
Namespace Prefix:	rbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The aggregate amount of all wholesale deposit accounts including certificates of deposits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

+ Details

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

X

- Definition

Amount of time deposit liabilities, including certificates of deposit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 405
-Topic 942
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478353/942-405-50-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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