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Regulatory Restrictions and Capital Ratios (Tables)
12 Months Ended
Dec. 31, 2014
Regulatory Capital Requirements [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
Minimum for capitalMinimum to be
Actualadequacy purposeswell capitalized
(Dollars in thousands)AmountRatioAmountRatioAmountRatio
At December 31, 2014:
Tier 1 Leverage Capital
Auburn National Bancorporation$80,35610.32%$31,1334.00%N/AN/A
AuburnBank78,96810.1631,0994.00$38,8735.00%
Tier 1 Risk-Based Capital
Auburn National Bancorporation$80,35617.45%$18,4194.00%N/AN/A
AuburnBank78,96817.1118,4634.00$27,6956.00%
Total Risk-Based Capital
Auburn National Bancorporation$85,35618.54%$36,8398.00%N/AN/A
AuburnBank83,96818.1936,9278.00$46,15810.00%
At December 31, 2013:
Tier 1 Leverage Capital
Auburn National Bancorporation$76,03710.10%$30,1194.00%N/AN/A
AuburnBank74,7169.9430,0694.00$37,5875.00%
Tier 1 Risk-Based Capital
Auburn National Bancorporation$76,03717.19%$17,6964.00%N/AN/A
AuburnBank74,71616.8417,7424.00$26,6146.00%
Total Risk-Based Capital
Auburn National Bancorporation$81,38518.40%$35,3928.00%N/AN/A
AuburnBank80,06418.0535,4858.00$44,35610.00%