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Regulatory Restrictions and Capital Ratios (Tables) | 12 Months Ended
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Dec. 31, 2014
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, 2014: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 Leverage Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Auburn National Bancorporation | $ | 80,356 |  | 10.32 | % |  | $ | 31,133 |  | 4.00 | % |  |  | N/A |  | N/A |
| AuburnBank |  | 78,968 |  | 10.16 |  |  |  | 31,099 |  | 4.00 |  |  | $ | 38,873 |  | 5.00 | %
Tier 1 Risk-Based Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Auburn National Bancorporation | $ | 80,356 |  | 17.45 | % |  | $ | 18,419 |  | 4.00 | % |  |  | N/A |  | N/A |
| AuburnBank |  | 78,968 |  | 17.11 |  |  |  | 18,463 |  | 4.00 |  |  | $ | 27,695 |  | 6.00 | %
Total Risk-Based Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Auburn National Bancorporation | $ | 85,356 |  | 18.54 | % |  | $ | 36,839 |  | 8.00 | % |  |  | N/A |  | N/A |
| AuburnBank |  | 83,968 |  | 18.19 |  |  |  | 36,927 |  | 8.00 |  |  | $ | 46,158 |  | 10.00 | %
At December 31, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 Leverage Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Auburn National Bancorporation | $ | 76,037 |  | 10.10 | % |  | $ | 30,119 |  | 4.00 | % |  |  | N/A |  | N/A |
| AuburnBank |  | 74,716 |  | 9.94 |  |  |  | 30,069 |  | 4.00 |  |  | $ | 37,587 |  | 5.00 | %
Tier 1 Risk-Based Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Auburn National Bancorporation | $ | 76,037 |  | 17.19 | % |  | $ | 17,696 |  | 4.00 | % |  |  | N/A |  | N/A |
| AuburnBank |  | 74,716 |  | 16.84 |  |  |  | 17,742 |  | 4.00 |  |  | $ | 26,614 |  | 6.00 | %
Total Risk-Based Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Auburn National Bancorporation | $ | 81,385 |  | 18.40 | % |  | $ | 35,392 |  | 8.00 | % |  |  | N/A |  | N/A |
| AuburnBank |  | 80,064 |  | 18.05 |  |  |  | 35,485 |  | 8.00 |  |  | $ | 44,356 |  | 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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826 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=7881181&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 1B -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958570-112826 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=7881181&loc=SL5958577-112826 + Details
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