Securities and loans pledged to secure public and trust deposits, securities sold under agreements to repurchase, FHLBB advances and credit facilities available (Details) - S A L Guarantee Type Other [Member] - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Securities available-for-sale (at fair value)	$ 80,456	$ 74,303
Loans receivable (at book value)	381,740	380,787
Total pledged assets	$ 462,196	$ 455,090