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Regulatory Capital (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Auburn National Bancorporation [Member]
   
Tier One Leverage Capital [Abstract]    
Tier One Leverage Capital $ 76,037 $ 71,982
Tier One Leverage Capital to Average Assets 10.10% 9.58%
Tier One Leverage Capital Required for Capital Adequacy 30,119 30,069
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 76,037 71,982
Tier One Risk Based Capital to Risk Weighted Assets 17.19% 16.20%
Tier One Risk Based Capital Required for Capital Adequacy 17,696 17,768
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 81,385 77,558
Total Risk Based Capital to Risk Weighted Assets 18.40% 17.46%
Total Risk Based Capital Required for Capital Adequacy 35,392 35,536
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 74,716 71,277
Tier One Leverage Capital to Average Assets 9.94% 9.50%
Tier One Leverage Capital Required for Capital Adequacy 30,069 30,011
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%
Tier One Leverage Capital Required to be Well Capitalized 37,587 37,514
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 74,716 71,277
Tier One Risk Based Capital to Risk Weighted Assets 16.84% 16.02%
Tier One Risk Based Capital Required for Capital Adequacy 17,742 17,794
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 26,614 26,691
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 80,064 76,853
Total Risk Based Capital to Risk Weighted Assets 18.05% 17.28%
Total Risk Based Capital Required for Capital Adequacy 35,485 35,588
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 $ 44,356 $ 44,485
Total Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 10.00% 10.00%