Cover - shares	6 Months Ended
	Jun. 30, 2024	Aug. 05, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2024
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	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		11,698,257
Entity Central Index Key	0001118004
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2024