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Regulatory Restrictions and Capital Ratios (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 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 | %
At December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 Leverage Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Auburn National Bancorporation | $ | 85,480 |  | 10.27 | % |  | $ | 33,293 |  | 4.00 | % |  |  | N/A |  | N/A |
| AuburnBank |  | 84,287 |  | 10.14 |  |  |  | 33,259 |  | 4.00 |  |  | $ | 41,574 |  | 5.00 | %
Common Equity Tier 1 Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Auburn National Bancorporation | $ | 82,642 |  | 16.44 | % |  | $ | 22,621 |  | 4.50 | % |  |  | N/A |  | N/A |
| AuburnBank |  | 84,287 |  | 16.74 |  |  |  | 22,663 |  | 4.50 |  |  | $ | 32,736 |  | 6.50 |
Tier 1 Risk-Based Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Auburn National Bancorporation | $ | 85,480 |  | 17.00 | % |  | $ | 30,162 |  | 6.00 | % |  |  | N/A |  | N/A |
| AuburnBank |  | 84,287 |  | 16.74 |  |  |  | 30,218 |  | 6.00 |  |  | $ | 40,290 |  | 8.00 | %
Total Risk-Based Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Auburn National Bancorporation | $ | 90,254 |  | 17.95 | % |  | $ | 40,216 |  | 8.00 | % |  |  | N/A |  | N/A |
| AuburnBank |  | 89,061 |  | 17.68 |  |  |  | 40,290 |  | 8.00 |  |  | $ | 50,363 |  | 10.00 | %

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958577-112826 + Details
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