Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Mar. 05, 2020	Jun. 30, 2019
Document and Entity Information [Abstract]
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Entity File Number	001-33037
Entity Registrant Name	Southern National Bancorp of Virginia Inc
Entity Incorporation, State or Country Code	VA
Entity Tax Identification Number	20-1417448
Entity Address, Address Line One	6830 Old Dominion Drive
Entity Address, City or Town	McLean
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	22101
City Area Code	703
Local Phone Number	893-7400
Title of 12(b) Security	Common Stock
Trading Symbol	SONA
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		24,295,380
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Entity Public Float			$ 347.4
Entity Central Index Key	0001325670
Amendment Flag	false
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No