Regulatory Capital (Details) - AuburnBank [Member] $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Tier One Leverage Capital [Abstract]
Tier One Leverage Capital	$ 103,886	$ 106,886
Tier One Leverage Capital to Average Assets	0.0972	0.1001
Tier One Leverage Capital Required for Capital Adequacy	$ 42,732	$ 42,716
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	0.0400	0.0400
Tier One Leverage Capital Required to be Well Capitalized	$ 53,415	$ 53,394
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	$ 103,886	$ 106,886
Common Equity Tier One Captial To Risk Weighted Assets	0.1452	0.1539
Common Equity Tier One Captial Required For Capital Adequacy	$ 32,194	$ 31,252
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	$ 46,503	$ 45,142
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	$ 103,886	$ 106,866
Tier One Risk Based Capital to Risk Weighted Assets	0.1452	0.1539
Tier One Risk Based Capital Required for Capital Adequacy	$ 42,926	$ 41,669
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	$ 57,234	$ 55,559
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	$ 111,035	$ 112,851
Total Risk Based Capital to Risk Weighted Assets	0.1552	0.1625
Total Risk Based Capital Required for Capital Adequacy	$ 57,234	$ 55,559
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	$ 71,543	$ 69,449
Total Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	0.1000	0.1000

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480696/942-505-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480696/942-505-50-1B

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