XML 14 R1.htm IDEA: XBRL DOCUMENT v3.3.1.900
Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2015
Mar. 09, 2016
Jun. 30, 2015
Document and entity information [Abstract]      
Entity public float     $ 59,782,523
Current fiscal year end date --12-31    
Entity central index key 0000750574    
Entity current reporting status Yes    
Entity filer category Smaller Reporting Company    
Entity registrant name Auburn National Bancorporation, Inc    
Trading Symbol AUBN    
Entity voluntary filers No    
Entity well known seasoned issuer No    
Entity common stock shares outstanding   3,643,478  
Amendment flag false    
Document Type 10-K    
Document Year Focus 2015    
Document Period Focus FY    
Document Period End Date Dec. 31, 2015