v3.19.3
Cover Page - shares
9 Months Ended
Sep. 30, 2019
Oct. 31, 2019
Cover page.    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2019  
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 402,  
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 561-5028  
Title of 12(b) Security Common Stock, no par value  
Trading Symbol RRBI  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business Category true  
Entity Emerging Growth Category true  
Entity Ex Transition Period true  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   7,306,221
Entity Central Index Key 0001071236  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus (i.e. Q1,Q2,Q3,FY) Q3  
Amendment Flag false