Regulatory Capital (Details) - AuburnBank [Member] $ in Thousands	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Tier One Leverage Capital [Abstract]
Tier One Leverage Capital	$ 106,288	$ 103,886
Tier One Leverage Capital to Average Assets	0.1049	0.0972
Tier One Leverage Capital Required for Capital Adequacy	$ 40,543	$ 42,732
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	0.0400	0.0400
Tier One Leverage Capital Required to be Well Capitalized	$ 50,679	$ 53,415
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	$ 106,288	$ 103,886
Common Equity Tier One Captial To Risk Weighted Assets	0.1480	0.1452
Common Equity Tier One Captial Required For Capital Adequacy	$ 32,307	$ 32,194
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	$ 46,665	$ 46,503
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	$ 106,288	$ 103,886
Tier One Risk Based Capital to Risk Weighted Assets	0.1480	0.1452
Tier One Risk Based Capital Required for Capital Adequacy	$ 43,075	$ 42,926
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	$ 57,434	$ 57,234
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	$ 113,487	$ 111,035
Total Risk Based Capital to Risk Weighted Assets	0.1581	0.1552
Total Risk Based Capital Required for Capital Adequacy	$ 57,434	$ 57,234
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	$ 71,792	$ 71,543
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/1943274/2147477270/942-505-50-1

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/1943274/2147477270/942-505-50-1B

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