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Note 7 - Premises and Equipment (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Depreciation and Leasehold Amortization, Excluding Intangibles Amortization	$ 2,000,000	$ 2,000,000	$ 1,900,000
Gain (Loss) on Disposition of Property Plant Equipment	$ 32,000	$ 757,000	$ 0

X

- Definition

The amount of depreciation and leasehold amortization, excluding intangibles amortization.

+ References

No definition available.

+ Details

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

X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration