Document And Entity Information	9 Months Ended
	Sep. 30, 2015 shares
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Entity Registrant Name	FIRST BANCSHARES INC /MS/
Entity Central Index Key	0000947559
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Trading Symbol	FBMS
Entity Common Stock, Shares Outstanding	5,403,159