Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 06, 2018
Document And Entity Information
Entity Registrant Name	F&M BANK CORP
Entity Central Index Key	0000740806
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Common Stock, Shares Outstanding		3,218,974
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2018