Regulatory Capital (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Auburn National Bancorporation [Member]
Tier One Leverage Capital [Abstract]
Tier One Leverage Capital	$ 85,480	$ 84,268
Tier One Leverage Capital to Average Assets	10.27%	10.35%
Tier One Leverage Capital Required for Capital Adequacy	$ 33,293	$ 32,553
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	$ 82,642	$ 77,714
Common Equity Tier One Captial To Risk Weighted Assets	16.44%	15.28%
Common Equity Tier One Captial Required For Capital Adequacy	$ 22,621	$ 22,886
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	$ 85,480	$ 84,268
Tier One Risk Based Capital to Risk Weighted Assets	17.00%	16.57%
Tier One Risk Based Capital Required for Capital Adequacy	$ 30,162	$ 30,515
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	$ 90,254	$ 88,682
Total Risk Based Capital to Risk Weighted Assets	17.95%	17.44%
Total Risk Based Capital Required for Capital Adequacy	$ 40,216	$ 40,687
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	$ 84,287	$ 82,848
Tier One Leverage Capital to Average Assets	10.14%	10.19%
Tier One Leverage Capital Required for Capital Adequacy	$ 33,259	$ 32,519
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	4.00%
Tier One Leverage Capital Required to be Well Capitalized	$ 41,574	$ 40,649
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	$ 84,287	$ 82,848
Common Equity Tier One Captial To Risk Weighted Assets	16.74%	16.26%
Common Equity Tier One Captial Required For Capital Adequacy	$ 22,663	$ 22,933
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	$ 32,736	$ 33,125
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	$ 84,287	$ 82,848
Tier One Risk Based Capital to Risk Weighted Assets	16.74%	16.26%
Tier One Risk Based Capital Required for Capital Adequacy	$ 30,218	$ 30,577
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	$ 40,290	$ 40,769
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	$ 89,061	$ 87,262
Total Risk Based Capital to Risk Weighted Assets	17.68%	17.12%
Total Risk Based Capital Required for Capital Adequacy	$ 40,290	$ 40,769
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	$ 50,363	$ 50,962
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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The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

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The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.

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Total Capital divided by risk weighted assets as defined in the regulations.

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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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The amount of Tier 1 Leverage Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action.

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The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action.

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

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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.

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The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action.

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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.

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Tier 1 capital divided by risk weighted assets as defined by regulations.

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