Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2011	Mar. 09, 2012	Jun. 30, 2011
Document information line items
Document Type	10-K
Amendment flag	false
Document Year Focus	2011
Document Period Focus	FY
Document Period End Date	Dec. 31, 2011
Entity Information
Current fiscal year end date	--12-31
Entity central index key	0000750574
Entity current reporting status	Yes
Entity filer category	Non-accelerated Filer
Entity registrant name	Auburn National Bancorporation, Inc
Entity voluntary filers	No
Entity well known seasoned issuer	No
Entity common stock shares outstanding		3,642,738
Entity public float			$ 45,819,862