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Auburn National Bancorporation - Parent Only, Statement of Earnings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income:    
Other noninterest income $ 1,425 $ 1,428
Other Expenses [Abstract]    
Total interest expense 3,594 4,084
Gain on early extinguishment of debt 0 (790)
Total noninterest expense 16,784 15,348
Income Tax Expense (Benefit) 3,637 3,102
Net earnings 7,846 8,150
Parent Company [Member]    
Income:    
Dividends from bank subsidiary 3,471 6,709
Other noninterest income 141 129
Total income 3,612 6,838
Other Expenses [Abstract]    
Total interest expense 125 228
Gain on early extinguishment of debt 0 790
Total noninterest expense 225 193
Operating Expenses 350 (369)
Earnings Before Income Tax Expense (Benefit) And Equity In Undistributed Earnings Of Bank Subsidary 3,262 7,207
Income Tax Expense (Benefit) (58) 157
Earnings Before Equity In Undistributed Earnings Of Bank Subsidary 3,320 7,050
Equity In Undistributed Earnings Of Bank Subsidary 4,526 1,100
Net earnings $ 7,846 $ 8,150