Allowance for Loan and Lease Losses (the Allowance) - Roll-forward of allowance by portfolio segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	$ 17,767	$ 9,513
Charge-offs	(211)	(131)
Recoveries	132	83
Provision	1,070	8,302
Balance at end of period	18,758	17,767
Commercial mortgage.
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	7,451	3,426
Provision	(2,501)	4,025
Balance at end of period	4,950	7,451
Home equity lines and loans
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	434	342
Charge-offs	(81)	(90)
Recoveries	82	14
Provision	(211)	168
Balance at end of period	224	434
Residential mortgage
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	385	179
Recoveries	5	7
Provision	(107)	199
Balance at end of period	283	385
Construction
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	2,421	2,362
Provision	(379)	59
Balance at end of period	2,042	2,421
Commercial and industrial
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	5,431	2,684
Charge-offs		(31)
Recoveries	41	58
Provision	1,061	2,720
Balance at end of period	6,533	5,431
Small business loans
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	1,259	509
Provision	2,478	750
Balance at end of period	3,737	1,259
Consumer
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	4	6
Charge-offs		(10)
Recoveries	4	4
Provision	(5)	4
Balance at end of period	3	4
Leases, net
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	382	5
Charge-offs	(130)
Provision	734	377
Balance at end of period	$ 986	$ 382