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Regulatory Restrictions and Capital Ratios (Tables)
12 Months Ended
Dec. 31, 2018
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, 2018:
Tier 1 Leverage Capital
AuburnBank$91,71911.33%$32,3684.00%$40,4615.00%
Common Equity Tier 1 Capital
AuburnBank$91,71916.49%$25,0314.50%$36,1566.50%
Tier 1 Risk-Based Capital
AuburnBank$91,71916.49%$33,3756.00%$44,5008.00%
Total Risk-Based Capital
AuburnBank$96,66117.38%$44,5008.00%$55,62510.00%
At December 31, 2017:
Tier 1 Leverage Capital
Auburn National Bancorporation$90,38210.95%$33,0124.00%N/AN/A
AuburnBank89,21710.8232,9784.00$41,2225.00%
Common Equity Tier 1 Capital
Auburn National Bancorporation$87,38216.42%$23,9494.50%N/AN/A
AuburnBank89,21716.7423,9874.50$34,6486.50%
Tier 1 Risk-Based Capital
Auburn National Bancorporation$90,38216.98%$31,9326.00%N/AN/A
AuburnBank89,21716.7431,9836.00$42,6448.00%
Total Risk-Based Capital
Auburn National Bancorporation$95,30017.91%$42,5768.00%N/AN/A
AuburnBank94,13517.6642,6448.00$53,30510.00%