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Note 8 - Deposits (Details Textual) Pure in Thousands	Mar. 26, 2020
Federal Reserve Reserve Ratio	0.00%

X

- Definition

Represents reserve ratio for federal reserve.

+ References

No definition available.

+ Details

Name:	rbb_FederalReserveReserveRatio
Namespace Prefix:	rbb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant