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Regulatory Restrictions and Capital Ratios (Tables)
12 Months Ended
Dec. 31, 2015
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, 2015:
Common Equity Tier 1 Capital
Auburn National Bancorporation$77,71415.28%$22,8864.50%N/AN/A
AuburnBank82,84816.2622,9334.50$33,1256.50
Tier 1 Leverage Capital
Auburn National Bancorporation$84,26810.35%$32,5534.00%N/AN/A
AuburnBank82,84810.1932,5194.00$40,6495.00%
Tier 1 Risk-Based Capital
Auburn National Bancorporation$84,26816.57%$30,5156.00%N/AN/A
AuburnBank82,84816.2630,5776.00$40,7698.00%
Total Risk-Based Capital
Auburn National Bancorporation$88,68217.44%$40,6878.00%N/AN/A
AuburnBank87,26217.1240,7698.00$50,96210.00%
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%