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	Dec. 31, 2020	Dec. 31, 2019
Guarantor Obligations [Line Items]
Securities available-for-sale (at fair value)	$ 54,581	$ 52,845
Loans receivable (at book value)	420,415	434,329
Total pledged assets	$ 474,996	$ 487,174