Document and Entity Information
Jan. 31, 2023
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jan. 31, 2023
Entity Registrant Name The First Bancshares, Inc.
Entity Incorporation, State or Country Code MS
Entity File Number 000-22507
Entity Tax Identification Number 64-0862173
Entity Address, Address Line One 6480 U.S. Hwy 98 West
Entity Address, City or Town Hattiesburg
Entity Address, State or Province MS
Entity Address, Postal Zip Code 39402
City Area Code 601
Local Phone Number 268-8998
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0000947559
Title of 12(b) Security Common Stock
Trading Symbol FBMS
Security Exchange Name NASDAQ