The following securities and loans were pledged to secure public and trust deposits, securities sold under agreements to repurchase, FHLBB advances and credit facilities available (Details) - Guarantee Type, Other [Member] - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Guarantor Obligations [Line Items]
Securities available-for-sale (at fair value)	$ 61,683	$ 54,581
Loans receivable	402,538	420,415
Total pledged assets	$ 464,221	$ 474,996