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Regulatory Capital (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Auburn National Bancorporation [Member]
Tier One Leverage Capital [Abstract]
Tier One Leverage Capital	$ 71,982	$ 68,220
Tier One Leverage Capital to Average Assets	9.58%	8.82%
Tier One Leverage Capital Required for Capital Adequacy	30,069	30,927
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	4.00%
Tier One Risk Based Capital [Abstract]
Tier One Risk Based Capital	71,982	68,220
Tier One Risk Based Capital to Risk Weighted Assets	16.20%	15.40%
Tier One Risk Based Capital Required for Capital Adequacy	17,768	17,715
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	4.00%	4.00%
Total Risk-Based Capital
Total Risk Based Capital	77,558	73,800
Total Risk Based Capital to Risk Weighted Assets	17.46%	16.66%
Total Risk Based Capital Required for Capital Adequacy	35,536	35,430
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	71,277	67,542
Tier One Leverage Capital to Average Assets	9.50%	8.75%
Tier One Leverage Capital Required for Capital Adequacy	30,011	30,868
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	4.00%
Tier One Leverage Capital Required to be Well Capitalized	37,514	38,585
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%	5.00%
Tier One Risk Based Capital [Abstract]
Tier One Risk Based Capital	71,277	67,542
Tier One Risk Based Capital to Risk Weighted Assets	16.02%	15.23%
Tier One Risk Based Capital Required for Capital Adequacy	17,794	17,742
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	4.00%	4.00%
Tier One Risk Based Capital Required to be Well Capitalized	26,691	26,614
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.00%	6.00%
Total Risk-Based Capital
Total Risk Based Capital	76,853	73,122
Total Risk Based Capital to Risk Weighted Assets	17.28%	16.49%
Total Risk Based Capital Required for Capital Adequacy	35,588	35,485
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	$ 44,485	$ 44,356
Total Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%	10.00%

X

- Definition

The amount of total capital as defined in the regulations.

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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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-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.



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