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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Feb. 29, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-38888    
Entity Registrant Name Red River Bancshares, Inc.    
Entity Incorporation, State or Country Code LA    
Entity Tax Identification Number 72-1412058    
Entity Address, Address Line One 1412 Centre Court Drive, Suite 301    
Entity Address, City or Town Alexandria    
Entity Address, State or Province LA    
Entity Address, Postal Zip Code 71301    
City Area Code 318    
Local Phone Number 561-4000    
Title of 12(b) Security Common Stock, no par value    
Trading Symbol RRBI    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business Category false    
Entity Emerging Growth Category true    
Entity Ex Transition Period true    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 234.4
Entity Common Stock, Shares Outstanding   7,092,448  
Documents Incorporated by Reference
Portions of the Registrant’s Definitive Proxy Statement for the 2024 Annual Meeting of Shareholders of Red River Bancshares, Inc. to be held on May 2, 2024, are incorporated by reference into Part III of this Report to the extent stated herein. Such Definitive Proxy Statement will be filed with the SEC within 120 days after the end of the Registrant’s fiscal year ended December 31, 2023.
    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Central Index Key 0001071236