Auburn National Bancorporation - Parent Only, Statement of Earnings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income:
Other noninterest income	$ 1,644	$ 1,880
Other Expenses [Abstract]
Total interest expense	3,856	4,183
Total noninterest expense	19,554	19,697
Income Tax Expense (Benefit)	1,605	2,370
Net earnings	7,454	9,741
Parent Company [Member]
Income:
Dividends from bank subsidiary	3,638	8,574
Other noninterest income	862	346
Total income	4,500	8,920
Other Expenses [Abstract]
Total noninterest expense	255	212
Operating Expenses	255	212
Earnings Before Income Tax Expense (Benefit) And Equity In Undistributed Earnings Of Bank Subsidary	4,245	8,708
Income Tax Expense (Benefit)	110	26
Earnings Before Equity In Undistributed Earnings Of Bank Subsidary	4,135	8,682
Equity In Undistributed Earnings Of Bank Subsidary	3,319	1,059
Net earnings	$ 7,454	$ 9,741