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Regulatory Capital (Details) - AuburnBank [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Tier One Leverage Capital [Abstract]
Tier One Leverage Capital	$ 92,778	$ 91,719
Tier One Leverage Capital to Average Assets	11.23%	11.33%
Tier One Leverage Capital Required for Capital Adequacy	$ 33,043	$ 32,368
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%	4.00%
Tier One Leverage Capital Required to be Well Capitalized	$ 41,303	$ 40,461
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%	5.00%
Common Equity Tier One Capital [Abstract]
Common Equity Tier One Capital Amount	$ 92,778	$ 91,719
Common Equity Tier One Captial To Risk Weighted Assets	17.28%	16.49%
Common Equity Tier One Captial Required For Capital Adequacy	$ 24,162	$ 25,031
Common Equity Tier One Captial Required for Capital Adequacy To Risk Weighted Assets	4.50%	4.50%
Common Equity Tier One Captial Required For Well Capitalized	$ 34,901	$ 36,156
Common Equity Tier One Captial Required For Well Capitalized To Risk Weighted Assets	6.50%	6.50%
Tier One Risk Based Capital [Abstract]
Tier One Risk Based Capital	$ 92,778	$ 91,719
Tier One Risk Based Capital to Risk Weighted Assets	17.28%	16.49%
Tier One Risk Based Capital Required for Capital Adequacy	$ 32,216	$ 33,375
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	6.00%	6.00%
Tier One Risk Based Capital Required to be Well Capitalized	$ 42,955	$ 44,500
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%	8.00%
Total Risk-Based Capital [Abstract]
Total Risk Based Capital	$ 97,291	$ 96,661
Total Risk Based Capital to Risk Weighted Assets	18.12%	17.38%
Total Risk Based Capital Required for Capital Adequacy	$ 42,955	$ 44,500
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	$ 53,693	$ 55,625
Total Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%	10.00%

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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