Regulatory Capital (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Auburn National Bancorporation [Member]
Tier One Leverage Capital [Abstract]
Tier One Leverage Capital		$ 90,382
Tier One Leverage Capital to Average Assets		10.95%
Tier One Leverage Capital Required for Capital Adequacy		$ 33,012
Tier One Leverage Capital Required for Capital Adequacy to Average Assets		4.00%
Common Equity Tier One Capital [Abstract]
Common Equity Tier One Capital Amount		$ 87,382
Common Equity Tier One Captial To Risk Weighted Assets		16.42%
Common Equity Tier One Captial Required For Capital Adequacy		$ 23,949
Common Equity Tier One Captial Required for Capital Adequacy To Risk Weighted Assets		4.50%
Tier One Risk Based Capital [Abstract]
Tier One Risk Based Capital		$ 90,382
Tier One Risk Based Capital to Risk Weighted Assets		16.98%
Tier One Risk Based Capital Required for Capital Adequacy		$ 31,932
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets		6.00%
Total Risk-Based Capital [Abstract]
Total Risk Based Capital		$ 95,300
Total Risk Based Capital to Risk Weighted Assets		17.91%
Total Risk Based Capital Required for Capital Adequacy		$ 42,576
Total Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets		8.00%
AuburnBank [Member]
Tier One Leverage Capital [Abstract]
Tier One Leverage Capital	$ 91,719	$ 89,217
Tier One Leverage Capital to Average Assets	11.33%	10.82%
Tier One Leverage Capital Required for Capital Adequacy	$ 32,368	$ 32,978
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	4.00%
Tier One Leverage Capital Required to be Well Capitalized	$ 40,461	$ 41,222
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 Amount	$ 91,719	$ 89,217
Common Equity Tier One Captial To Risk Weighted Assets	16.49%	16.74%
Common Equity Tier One Captial Required For Capital Adequacy	$ 25,031	$ 23,987
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	$ 36,156	$ 34,648
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	$ 91,719	$ 89,217
Tier One Risk Based Capital to Risk Weighted Assets	16.49%	16.74%
Tier One Risk Based Capital Required for Capital Adequacy	$ 33,375	$ 31,983
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	$ 44,500	$ 42,644
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	$ 96,661	$ 94,135
Total Risk Based Capital to Risk Weighted Assets	17.38%	17.66%
Total Risk Based Capital Required for Capital Adequacy	$ 44,500	$ 42,644
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	$ 55,625	$ 53,305
Total Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%	10.00%

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The amount of total capital as defined in the regulations.

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Percentage of Common Equity Tier One Risk-based Capital to total risk-weighted assets, as defined by regulatory framework.

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Amount of Common Equity Tier 1 Risk-based Capital required to be categorized as adequately capitalized under regulatory framework for prompt corrective action.

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Amount of Common Equity Tier 1 Risk-based Capital required to be categorized as well-capitalized under regulatory framework for prompt corrective action.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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The minimum amount of Tier 1 Leverage Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations.

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Tier 1 Leverage Capital divided by average assets as defined in the regulations.

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Tier 1 Risk Based Capital as defined in the regulations.

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