Self-Insurance (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Insurance [Abstract]
Liability, deductible	$ 135
Maximum coverage by the group	$ 4,100

Self Insurance, Maximum Aggregate Policy Deductible Per Group

No definition available.

Name:	rrbi_SelfInsuranceMaximumAggregatePolicyDeductiblePerGroup
Namespace Prefix:	rrbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant