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Regulatory Capital (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Auburn National Bancorporation [Member] |  |
Tier One Leverage Capital [Abstract] |  |
Tier One Leverage Capital | $ 90,382 | $ 85,480
Tier One Leverage Capital to Average Assets | 10.95% | 10.27%
Tier One Leverage Capital Required for Capital Adequacy | $ 33,012 | $ 33,293
Tier One Leverage Capital Required for Capital Adequacy to Average Assets | 4.00% | 4.00%
Common Equity Tier One Capital [Abstract] |  |
Common Equity Tier One Capital | $ 87,382 | $ 82,642
Common Equity Tier One Captial To Risk Weighted Assets | 16.42% | 16.44%
Common Equity Tier One Captial Required For Capital Adequacy | $ 23,949 | $ 22,621
Common Equity Tier One Captial Required for Capital Adequacy To Risk Weighted Assets | 4.50% | 4.50%
Tier One Risk Based Capital [Abstract] |  |
Tier One Risk Based Capital | $ 90,382 | $ 85,480
Tier One Risk Based Capital to Risk Weighted Assets | 16.98% | 17.00%
Tier One Risk Based Capital Required for Capital Adequacy | $ 31,932 | $ 30,162
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 6.00% | 6.00%
Total Risk-Based Capital [Abstract] |  |
Total Risk Based Capital | $ 95,300 | $ 90,254
Total Risk Based Capital to Risk Weighted Assets | 17.91% | 17.95%
Total Risk Based Capital Required for Capital Adequacy | $ 42,576 | $ 40,216
Total Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 8.00% | 8.00%
AuburnBank [Member] |  |
Tier One Leverage Capital [Abstract] |  |
Tier One Leverage Capital | $ 89,217 | $ 84,287
Tier One Leverage Capital to Average Assets | 10.82% | 10.14%
Tier One Leverage Capital Required for Capital Adequacy | $ 32,978 | $ 33,259
Tier One Leverage Capital Required for Capital Adequacy to Average Assets | 4.00% | 4.00%
Tier One Leverage Capital Required to be Well Capitalized | $ 41,222 | $ 41,574
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 | $ 89,217 | $ 84,287
Common Equity Tier One Captial To Risk Weighted Assets | 16.74% | 16.74%
Common Equity Tier One Captial Required For Capital Adequacy | $ 23,987 | $ 22,663
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 | $ 34,648 | $ 32,736
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 | $ 89,217 | $ 84,287
Tier One Risk Based Capital to Risk Weighted Assets | 16.74% | 16.74%
Tier One Risk Based Capital Required for Capital Adequacy | $ 31,983 | $ 30,218
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 | $ 42,644 | $ 40,290
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 | $ 94,135 | $ 89,061
Total Risk Based Capital to Risk Weighted Assets | 17.66% | 17.68%
Total Risk Based Capital Required for Capital Adequacy | $ 42,644 | $ 40,290
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 | $ 53,305 | $ 50,363
Total Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 10.00% | 10.00%

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- Definition The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The amount of Tier 1 Leverage Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: 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 + Details
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- Definition The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + 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=35709795&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=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: 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 2: 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 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 + Details
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- Definition The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: 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 + Details
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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: 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 + Details
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