v3.26.1
Cover - shares
3 Months Ended
Mar. 31, 2026
Apr. 30, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
Document Transition Report false  
Entity File Number 333-236022  
Entity Registrant Name BANCPLUS CORPORATION  
Entity Incorporation, State or Country Code MS  
Entity Tax Identification Number 64-0655312  
Entity Address, Address Line One 1068 Highland Colony Parkway  
Entity Address, City or Town Ridgeland  
Entity Address, State or Province MS  
Entity Address, Postal Zip Code 39157  
City Area Code 601  
Local Phone Number 898-8300  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   11,732,898
Entity Central Index Key 0001118004  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2026