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Note 17 - Regulatory Matters (Details Textual) $ in Billions	12 Months Ended
	Dec. 31, 2024	Jan. 01, 2024 USD ($)
Capital Conservation Buffer	2.50%
Required Assets To Liabilities Ratio After Dividend Effect	1.25
Minimum [Member]
Regulatory Assets, Total		$ 3

X

- Definition

Represents information related to capital conservation buffer.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
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X

- Definition

Represents required assets to liabilities ratio after dividend effect.

+ References

No definition available.

+ Details

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Namespace Prefix:	rbb_
Data Type:	xbrli:pureItemType
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X

- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 340
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478742/980-340-50-1

+ Details

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Balance Type:	debit
Period Type:	instant

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- Details

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