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, 2022	Dec. 31, 2021
Securities available-for-sale (at fair value)	$ 76,334	$ 75,737
Loans receivable (at book value)	368,531	378,845
Total pledged assets	$ 444,865	$ 454,582