Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2020	Aug. 05, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transistion Report	false
Entity File Number	0-26486
Entity Registrant Name	Auburn National Bancorporation, Inc.
Entity Incorporation State	DE
Entity Tax Identification Number	63-0885779
Entity Address Address Line 1	100 N. Gay Street
Entity Address City	Auburn
Entity Address State	AL
Entity Address Postal Zip	36830
City Area Code	334
Local Phone Number	821-9200
Entity current reporting status	Yes
Entity filer category	Accelerated Filer
Entity Interactive Data Current	Yes
Entity Small Business	true
Entity Emerging Growth	false
Entity Shell Company	false
Entity common stock shares outstanding		3,566,221
Entity central index key	0000750574
Current fiscal year end date	--12-31
Document Fiscal Year Focus	2020
Document Period Focus	Q2
Amendment flag	false
Title of 12(b) Security	Common Stock, par value $0.01
Trading Symbol	AUBN
Security Exchange Name	NASDAQ