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Regulatory Capital (Details) - AuburnBank [Member] - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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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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