Commitments, Contingencies and Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) payment	Dec. 31, 2020 USD ($)
Other Commitments [Line Items]
Commitments to originate loans	$ 38,653	$ 22,957
Commitments to sell residential mortgage loans	0	3,493
Letters of credit	23,164	28,038
Residential mortgages
Other Commitments [Line Items]
Commitments to originate residential mortgages loans for sale	$ 0	3,121
Early payment default period | payment	4
Commercial real estate
Other Commitments [Line Items]
Unadvanced portions	$ 22,035	14,935
Commercial and industrial
Other Commitments [Line Items]
Unadvanced portions	565,921	530,525
Commercial and residential construction
Other Commitments [Line Items]
Unadvanced portions	325,348	228,309
Home equity loans and lines
Other Commitments [Line Items]
Unadvanced portions	126,651	118,686
Consumer Loan
Other Commitments [Line Items]
Unadvanced portions	$ 4,263	$ 4,269