Financial Instruments with Off-Balance Sheet Risk, Commitments and Contingencies - Schedule of Notional Amounts of Financial Instruments with Off-Balance Sheet Credit Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Unadvanced portions of loans [Member]
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Unadvanced portions of loans	$ 42,781	$ 39,817
Commitments to originate loans [Member]
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Unadvanced portions of loans	15,103	17,451
Standby letters of credit [Member]
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Unadvanced portions of loans	$ 318	$ 613