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Regulatory Restrictions and Capital Ratios (Tables) | 12 Months Ended
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Dec. 31, 2018
Regulatory Capital Requirements [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  |  |  |  |  |  |  | Minimum for capital |  | Minimum to be
|  | Actual |  | adequacy purposes |  | well capitalized
(Dollars in thousands) |  | Amount |  | Ratio |  |  |  | Amount |  | Ratio |  |  |  | Amount |  | Ratio |
At December 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 Leverage Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| AuburnBank | $ | 91,719 |  | 11.33 | % |  | $ | 32,368 |  | 4.00 | % |  | $ | 40,461 |  | 5.00 | %
Common Equity Tier 1 Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| AuburnBank | $ | 91,719 |  | 16.49 | % |  | $ | 25,031 |  | 4.50 | % |  | $ | 36,156 |  | 6.50 | %
Tier 1 Risk-Based Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| AuburnBank | $ | 91,719 |  | 16.49 | % |  | $ | 33,375 |  | 6.00 | % |  | $ | 44,500 |  | 8.00 | %
Total Risk-Based Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| AuburnBank | $ | 96,661 |  | 17.38 | % |  | $ | 44,500 |  | 8.00 | % |  | $ | 55,625 |  | 10.00 | %
At December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 Leverage Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Auburn National Bancorporation | $ | 90,382 |  | 10.95 | % |  | $ | 33,012 |  | 4.00 | % |  |  | N/A |  | N/A |
| AuburnBank |  | 89,217 |  | 10.82 |  |  |  | 32,978 |  | 4.00 |  |  | $ | 41,222 |  | 5.00 | %
Common Equity Tier 1 Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Auburn National Bancorporation | $ | 87,382 |  | 16.42 | % |  | $ | 23,949 |  | 4.50 | % |  |  | N/A |  | N/A |
| AuburnBank |  | 89,217 |  | 16.74 |  |  |  | 23,987 |  | 4.50 |  |  | $ | 34,648 |  | 6.50 | %
Tier 1 Risk-Based Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Auburn National Bancorporation | $ | 90,382 |  | 16.98 | % |  | $ | 31,932 |  | 6.00 | % |  |  | N/A |  | N/A |
| AuburnBank |  | 89,217 |  | 16.74 |  |  |  | 31,983 |  | 6.00 |  |  | $ | 42,644 |  | 8.00 | %
Total Risk-Based Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Auburn National Bancorporation | $ | 95,300 |  | 17.91 | % |  | $ | 42,576 |  | 8.00 | % |  |  | N/A |  | N/A |
| AuburnBank |  | 94,135 |  | 17.66 |  |  |  | 42,644 |  | 8.00 |  |  | $ | 53,305 |  | 10.00 | %

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