Regulatory Capital (Details) - AuburnBank [Member] $ in Thousands	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
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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