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Auburn National Bancorporation - Parent Only, Statement of Earnings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income:    
Other noninterest income $ 1,880 $ 1,486
Other Expenses [Abstract]    
Total interest expense 4,183 3,676
Total noninterest expense 19,697 17,874
Income Tax Expense (Benefit) 2,370 2,187
Net earnings 9,741 8,834
Parent Company [Member]    
Income:    
Dividends from bank subsidiary 8,574 6,533
Other noninterest income 346 149
Total income 8,920 6,682
Other Expenses [Abstract]    
Total interest expense 0 51
Total noninterest expense 212 237
Operating Expenses 212 288
Earnings Before Income Tax Expense (Benefit) And Equity In Undistributed Earnings Of Bank Subsidary 8,708 6,394
Income Tax Expense (Benefit) 26 (28)
Earnings Before Equity In Undistributed Earnings Of Bank Subsidary 8,682 6,422
Equity In Undistributed Earnings Of Bank Subsidary 1,059 2,412
Net earnings $ 9,741 $ 8,834