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Note 8 - Deposits - Schedule of Maturities of Time Deposits (Details) $ in Thousands	Dec. 31, 2023 USD ($)
One year, 250,000 and under	$ 1,994,517
Two to three years, 250,000 and under	6,689
Over three years, 250,000 and under	1,204
Total, 250,000 and under	$ 2,002,410

X

- Definition

Amount of time deposit, $250,000 or Less, maturing after third fiscal year following current fiscal year.

+ References

No definition available.

+ Details

Name:	rbb_TimeDepositMaturities250000OrLessOverThreeYears
Namespace Prefix:	rbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of time deposit $250,000 or less maturing in next fiscal year following current fiscal year. Time deposit includes, but is not limited to, certificate of deposit. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	rbb_TimeDepositMaturities250000OrLessYearOne
Namespace Prefix:	rbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of time deposit $250,000 or Less maturing in second and third fiscal year following current fiscal year. Time deposit includes, but is not limited to, certificate of deposit. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

Name:	rbb_TimeDepositMaturities250000OrLessYearsTwoAndThree
Namespace Prefix:	rbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of time deposit liabilities, including certificates of deposit, in denominations of $250,000 or Less.

+ References

No definition available.

+ Details

Name:	rbb_TimeDeposits250000OrLess
Namespace Prefix:	rbb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant