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Regulatory Restrictions and Capital Ratios (Tables) | 12 Months Ended
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Dec. 31, 2013
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, 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 | %
At December 31, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 Leverage Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Auburn National Bancorporation | $ | 71,982 |  | 9.58 | % |  | $ | 30,069 |  | 4.00 | % |  |  | N/A |  | N/A |
| AuburnBank |  | 71,277 |  | 9.50 |  |  |  | 30,011 |  | 4.00 |  |  | $ | 37,514 |  | 5.00 | %
Tier 1 Risk-Based Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Auburn National Bancorporation | $ | 71,982 |  | 16.20 | % |  | $ | 17,768 |  | 4.00 | % |  |  | N/A |  | N/A |
| AuburnBank |  | 71,277 |  | 16.02 |  |  |  | 17,794 |  | 4.00 |  |  | $ | 26,691 |  | 6.00 | %
Total Risk-Based Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Auburn National Bancorporation | $ | 77,558 |  | 17.46 | % |  | $ | 35,536 |  | 8.00 | % |  |  | N/A |  | N/A |
| AuburnBank |  | 76,853 |  | 17.28 |  |  |  | 35,588 |  | 8.00 |  |  | $ | 44,485 |  | 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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 18 -IssueDate 2006-05-01 -Chapter 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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