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Deposits - Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Deposits [Abstract] |  |
Deposits | $ 2,805,106 | $ 2,801,888
Securities and federal home loan banks letters of credit, pledged as collateral | $ 287,500 | $ 287,400

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- Definition Securities and Federal Home Loan Banks Letters of Credit, Pledged as Collateral + References No definition available. + Details
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Namespace Prefix: | rrbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(12)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
Name: | us-gaap_Deposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration