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Regulatory Capital (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Auburn National Bancorporation [Member]    
Tier One Leverage Capital [Abstract]    
Tier One Leverage Capital $ 90,382 $ 85,480
Tier One Leverage Capital to Average Assets 10.95% 10.27%
Tier One Leverage Capital Required for Capital Adequacy $ 33,012 $ 33,293
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%
Common Equity Tier One Capital [Abstract]    
Common Equity Tier One Capital $ 87,382 $ 82,642
Common Equity Tier One Captial To Risk Weighted Assets 16.42% 16.44%
Common Equity Tier One Captial Required For Capital Adequacy $ 23,949 $ 22,621
Common Equity Tier One Captial Required for Capital Adequacy To Risk Weighted Assets 4.50% 4.50%
Tier One Risk Based Capital [Abstract]    
Tier One Risk Based Capital $ 90,382 $ 85,480
Tier One Risk Based Capital to Risk Weighted Assets 16.98% 17.00%
Tier One Risk Based Capital Required for Capital Adequacy $ 31,932 $ 30,162
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 6.00% 6.00%
Total Risk-Based Capital [Abstract]    
Total Risk Based Capital $ 95,300 $ 90,254
Total Risk Based Capital to Risk Weighted Assets 17.91% 17.95%
Total Risk Based Capital Required for Capital Adequacy $ 42,576 $ 40,216
Total Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 8.00% 8.00%
AuburnBank [Member]    
Tier One Leverage Capital [Abstract]    
Tier One Leverage Capital $ 89,217 $ 84,287
Tier One Leverage Capital to Average Assets 10.82% 10.14%
Tier One Leverage Capital Required for Capital Adequacy $ 32,978 $ 33,259
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%
Tier One Leverage Capital Required to be Well Capitalized $ 41,222 $ 41,574
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 5.00% 5.00%
Common Equity Tier One Capital [Abstract]    
Common Equity Tier One Capital $ 89,217 $ 84,287
Common Equity Tier One Captial To Risk Weighted Assets 16.74% 16.74%
Common Equity Tier One Captial Required For Capital Adequacy $ 23,987 $ 22,663
Common Equity Tier One Captial Required for Capital Adequacy To Risk Weighted Assets 4.50% 4.50%
Common Equity Tier One Captial Required For Well Capitalized $ 34,648 $ 32,736
Common Equity Tier One Captial Required For Well Capitalized To Risk Weighted Assets 6.50% 6.50%
Tier One Risk Based Capital [Abstract]    
Tier One Risk Based Capital $ 89,217 $ 84,287
Tier One Risk Based Capital to Risk Weighted Assets 16.74% 16.74%
Tier One Risk Based Capital Required for Capital Adequacy $ 31,983 $ 30,218
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 6.00% 6.00%
Tier One Risk Based Capital Required to be Well Capitalized $ 42,644 $ 40,290
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 8.00% 8.00%
Total Risk-Based Capital [Abstract]    
Total Risk Based Capital $ 94,135 $ 89,061
Total Risk Based Capital to Risk Weighted Assets 17.66% 17.68%
Total Risk Based Capital Required for Capital Adequacy $ 42,644 $ 40,290
Total Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 8.00% 8.00%
Total Risk Based Capital Required to be Well Capitalized $ 53,305 $ 50,363
Total Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 10.00% 10.00%