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Regulatory Capital (Details) - AuburnBank [Member] $ in Thousands | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Tier One Leverage Capital [Abstract] |  |
Tier One Leverage Capital | $ 96,096 | $ 92,778
Tier One Leverage Capital to Average Assets | 0.1032 | 0.1123
Tier One Leverage Capital Required for Capital Adequacy | $ 37,263 | $ 33,043
Tier One Leverage Capital Required for Capital Adequacy to Average Assets | 0.0400 | 0.0400
Tier One Leverage Capital Required to be Well Capitalized | $ 46,579 | $ 41,303
Tier One Leverage Capital Required to be Well Capitalized to Average Assets | 0.0500 | 0.0500
Common Equity Tier One Capital [Abstract] |  |
Common Equity Tier One Capital Amount | $ 96,096 | $ 92,778
Common Equity Tier One Captial To Risk Weighted Assets | 0.1727 | 0.1728
Common Equity Tier One Captial Required For Capital Adequacy | $ 25,042 | $ 24,162
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 | $ 36,171 | $ 34,901
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 | $ 96,096 | $ 92,778
Tier One Risk Based Capital to Risk Weighted Assets | 0.1727 | 0.1728
Tier One Risk Based Capital Required for Capital Adequacy | $ 33,389 | $ 32,216
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 0.0600 | 0.0600
Tier One Risk Based Capital Required to be Well Capitalized | $ 44,519 | $ 42,955
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 0.0800 | 0.0800
Total Risk-Based Capital [Abstract] |  |
Total Risk Based Capital | $ 101,906 | $ 97,291
Total Risk Based Capital to Risk Weighted Assets | 0.1831 | 0.1812
Total Risk Based Capital Required for Capital Adequacy | $ 44,519 | $ 42,955
Total Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 0.0800 | 0.0800
Total Risk Based Capital Required to be Well Capitalized | $ 55,648 | $ 53,693
Total Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 0.1000 | 0.1000

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