Regulatory Capital (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Auburn National Bancorporation [Member]
Tier One Risk Based Capital [Abstract]
Tier One Risk Based Capital	$ 84,268	$ 80,356
Tier One Risk Based Capital to Risk Weighted Assets	16.57%	17.45%
Tier One Risk Based Capital Required for Capital Adequacy	$ 30,515	$ 18,419
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	6.00%	4.00%
Common Equity Tier One Capital [Abstract]
Common Equity Tier One Capital	$ 77,714
Common Equity Tier One Captial To Risk Weighted Assets	15.28%
Common Equity Tier One Captial Required For Capital Adequacy	$ 22,886
Common Equity Tier One Captial Required for Capital Adequacy To Risk Weighted Assets	4.50%
Total Risk-Based Capital [Abstract]
Total Risk Based Capital	$ 88,682	$ 85,356
Total Risk Based Capital to Risk Weighted Assets	17.44%	18.54%
Total Risk Based Capital Required for Capital Adequacy	$ 40,687	$ 36,839
Total Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%	8.00%
Tier One Leverage Capital [Abstract]
Tier One Leverage Capital	$ 84,268	$ 80,356
Tier One Leverage Capital to Average Assets	10.35%	10.32%
Tier One Leverage Capital Required for Capital Adequacy	$ 32,553	$ 31,133
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	4.00%
AuburnBank [Member]
Tier One Risk Based Capital [Abstract]
Tier One Risk Based Capital	$ 82,848	$ 78,968
Tier One Risk Based Capital to Risk Weighted Assets	16.26%	17.11%
Tier One Risk Based Capital Required for Capital Adequacy	$ 30,577	$ 18,463
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	6.00%	4.00%
Tier One Risk Based Capital Required to be Well Capitalized	$ 40,769	$ 27,695
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%	6.00%
Common Equity Tier One Capital [Abstract]
Common Equity Tier One Capital	$ 82,848
Common Equity Tier One Captial To Risk Weighted Assets	16.26%
Common Equity Tier One Captial Required For Capital Adequacy	$ 22,933
Common Equity Tier One Captial Required for Capital Adequacy To Risk Weighted Assets	4.50%
Common Equity Tier One Captial Required For Well Capitalized	$ 33,125
Common Equity Tier One Captial Required For Well Capitalized To Risk Weighted Assets	6.50%
Total Risk-Based Capital [Abstract]
Total Risk Based Capital	$ 87,262	$ 83,968
Total Risk Based Capital to Risk Weighted Assets	17.12%	18.19%
Total Risk Based Capital Required for Capital Adequacy	$ 40,769	$ 36,927
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	$ 50,962	$ 46,158
Total Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%	10.00%
Tier One Leverage Capital [Abstract]
Tier One Leverage Capital	$ 82,848	$ 78,968
Tier One Leverage Capital to Average Assets	10.19%	10.16%
Tier One Leverage Capital Required for Capital Adequacy	$ 32,519	$ 31,099
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	4.00%
Tier One Leverage Capital Required to be Well Capitalized	$ 40,649	$ 38,873
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%	5.00%

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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 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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