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Note 8 - Deposits (Details Textual) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Brokered Time Deposits	$ 320.7	$ 255.0

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