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Loans and Asset Quality - Schedule of Reserve For Unfunded Commitments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance			$ 21,336	$ 20,628
Provision for credit losses	$ 300	$ 185	900	485
Ending Balance	21,757	21,183	21,757	21,183
Provision for credit losses			800
Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance				278
Unfunded commitments
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance			442	0
Provision for credit losses			100	0
Ending Balance	$ 542	$ 442	542	442
Unfunded commitments | Impact of ASC 326 Adoption
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance			$ 0	$ 442

X

- Definition

Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) Excluding Unfunded Loan Commitments

+ References

No definition available.

+ Details

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Namespace Prefix:	rrbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

+ Details

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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X

- Definition

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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- Details

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