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Auburn National Bancorporation - Parent Only, Statement of Earnings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income:    
Other noninterest income $ 1,486 $ 1,425
Other Expenses [Abstract]    
Total interest expense 3,676 3,594
Total noninterest expense 17,874 16,784
Income Tax Expense (Benefit) 2,187 3,637
Net earnings 8,834 7,846
Parent Company [Member]    
Income:    
Dividends from bank subsidiary 6,533 3,471
Other noninterest income 149 141
Total income 6,682 3,612
Other Expenses [Abstract]    
Total interest expense 51 125
Total noninterest expense 237 225
Operating Expenses 288 350
Earnings Before Income Tax Expense (Benefit) And Equity In Undistributed Earnings Of Bank Subsidary 6,394 3,262
Income Tax Expense (Benefit) (28) (58)
Earnings Before Equity In Undistributed Earnings Of Bank Subsidary 6,422 3,320
Equity In Undistributed Earnings Of Bank Subsidary 2,412 4,526
Net earnings $ 8,834 $ 7,846