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Regulatory Capital (Details) - AuburnBank [Member] $ in Thousands | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
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Tier One Leverage Capital [Abstract] |  |
Tier One Leverage Capital | $ 106,886 | $ 100,059
Tier One Leverage Capital to Average Assets | 0.1001 | 0.0935
Tier One Leverage Capital Required for Capital Adequacy | $ 42,716 | $ 42,808
Tier One Leverage Capital Required for Capital Adequacy to Average Assets | 0.0400 | 0.0400
Tier One Leverage Capital Required to be Well Capitalized | $ 53,394 | $ 53,509
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 | $ 106,886 | $ 100,059
Common Equity Tier One Captial To Risk Weighted Assets | 0.1539 | 0.1623
Common Equity Tier One Captial Required For Capital Adequacy | $ 31,252 | $ 27,742
Common Equity Tier One Captial Required for Capital Adequacy To Risk Weighted Assets | 0.0450 | 0.0450
Common Equity Tier One Captial Required For Well Capitalized | $ 45,142 | $ 40,072
Common Equity Tier One Captial Required For Well Capitalized To Risk Weighted Assets | 0.0650 | 0.0650
Tier One Risk Based Capital [Abstract] |  |
Tier One Risk Based Capital | $ 106,886 | $ 100,059
Tier One Risk Based Capital to Risk Weighted Assets | 0.1539 | 0.1623
Tier One Risk Based Capital Required for Capital Adequacy | $ 41,669 | $ 36,990
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 | $ 55,559 | $ 49,320
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 | $ 112,851 | $ 105,163
Total Risk Based Capital to Risk Weighted Assets | 0.1625 | 0.1706
Total Risk Based Capital Required for Capital Adequacy | $ 55,559 | $ 49,320
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 | $ 69,449 | $ 61,649
Total Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 0.1000 | 0.1000

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