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Regulatory Capital (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Auburn National Bancorporation [Member] |  |
Tier One Leverage Capital [Abstract] |  |
Tier One Leverage Capital |  | $ 90,382
Tier One Leverage Capital to Average Assets |  | 10.95%
Tier One Leverage Capital Required for Capital Adequacy |  | $ 33,012
Tier One Leverage Capital Required for Capital Adequacy to Average Assets |  | 4.00%
Common Equity Tier One Capital [Abstract] |  |
Common Equity Tier One Capital Amount |  | $ 87,382
Common Equity Tier One Captial To Risk Weighted Assets |  | 16.42%
Common Equity Tier One Captial Required For Capital Adequacy |  | $ 23,949
Common Equity Tier One Captial Required for Capital Adequacy To Risk Weighted Assets |  | 4.50%
Tier One Risk Based Capital [Abstract] |  |
Tier One Risk Based Capital |  | $ 90,382
Tier One Risk Based Capital to Risk Weighted Assets |  | 16.98%
Tier One Risk Based Capital Required for Capital Adequacy |  | $ 31,932
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets |  | 6.00%
Total Risk-Based Capital [Abstract] |  |
Total Risk Based Capital |  | $ 95,300
Total Risk Based Capital to Risk Weighted Assets |  | 17.91%
Total Risk Based Capital Required for Capital Adequacy |  | $ 42,576
Total Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets |  | 8.00%
AuburnBank [Member] |  |
Tier One Leverage Capital [Abstract] |  |
Tier One Leverage Capital | $ 91,719 | $ 89,217
Tier One Leverage Capital to Average Assets | 11.33% | 10.82%
Tier One Leverage Capital Required for Capital Adequacy | $ 32,368 | $ 32,978
Tier One Leverage Capital Required for Capital Adequacy to Average Assets | 4.00% | 4.00%
Tier One Leverage Capital Required to be Well Capitalized | $ 40,461 | $ 41,222
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 Amount | $ 91,719 | $ 89,217
Common Equity Tier One Captial To Risk Weighted Assets | 16.49% | 16.74%
Common Equity Tier One Captial Required For Capital Adequacy | $ 25,031 | $ 23,987
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 | $ 36,156 | $ 34,648
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 | $ 91,719 | $ 89,217
Tier One Risk Based Capital to Risk Weighted Assets | 16.49% | 16.74%
Tier One Risk Based Capital Required for Capital Adequacy | $ 33,375 | $ 31,983
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 | $ 44,500 | $ 42,644
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 | $ 96,661 | $ 94,135
Total Risk Based Capital to Risk Weighted Assets | 17.38% | 17.66%
Total Risk Based Capital Required for Capital Adequacy | $ 44,500 | $ 42,644
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 | $ 55,625 | $ 53,305
Total Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 10.00% | 10.00%

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