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Fair Value Measurements - Additional Information (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Write-downs to OREO	$ 0	$ 0

X

- Definition

Write down on other real estate owned.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration