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Regulatory Capital (Details) - AuburnBank [Member] $ in Thousands | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Tier One Leverage Capital [Abstract] |  |
Tier One Leverage Capital | $ 100,059 | $ 96,096
Tier One Leverage Capital to Average Assets | 0.0935 | 0.1032
Tier One Leverage Capital Required for Capital Adequacy | $ 42,808 | $ 37,263
Tier One Leverage Capital Required for Capital Adequacy to Average Assets | 0.0400 | 0.0400
Tier One Leverage Capital Required to be Well Capitalized | $ 53,509 | $ 46,579
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 | $ 100,059 | $ 96,096
Common Equity Tier One Captial To Risk Weighted Assets | 0.1623 | 0.1727
Common Equity Tier One Captial Required For Capital Adequacy | $ 27,742 | $ 25,042
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 | $ 40,072 | $ 36,171
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 | $ 100,059 | $ 96,096
Tier One Risk Based Capital to Risk Weighted Assets | 0.1623 | 0.1727
Tier One Risk Based Capital Required for Capital Adequacy | $ 36,990 | $ 33,389
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 | $ 49,320 | $ 44,519
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 | $ 105,163 | $ 101,906
Total Risk Based Capital to Risk Weighted Assets | 0.1706 | 0.1831
Total Risk Based Capital Required for Capital Adequacy | $ 49,320 | $ 44,519
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 | $ 61,649 | $ 55,648
Total Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 0.1000 | 0.1000

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