Document and Entity Information	6 Months Ended
	Jun. 30, 2014	May 07, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	AMERICAN NATIONAL BANKSHARES INC.
Entity Central Index Key	0000741516
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		7,840,132
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q2
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2014