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Allowance for Loan Losses (the Allowance) - Allowance allocated by portfolio segment (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Impaired Loans
Allowance on loans and leases individually evaluated for impairment	$ 2,018	$ 1,645
Allowance on loans and leases collectively evaluated for impairment	16,358	16,122
Total	18,376	17,767	$ 11,098	$ 9,513
Carrying value of loans and leases individually evaluated for impairment	10,226	10,380
Carrying value of loans and leases collectively evaluated for impairment	1,335,232	1,267,194
Total	1,345,458	1,277,574
Commercial mortgage
Impaired Loans
Allowance on loans and leases collectively evaluated for impairment	7,655	7,451
Total	7,655	7,451	4,112	3,426
Carrying value of loans and leases individually evaluated for impairment	730	1,606
Carrying value of loans and leases collectively evaluated for impairment	516,691	483,497
Total	517,421	485,103
Home equity lines and loans
Impaired Loans
Allowance on loans and leases individually evaluated for impairment	8	9
Allowance on loans and leases collectively evaluated for impairment	302	425
Total	310	434	484	342
Carrying value of loans and leases individually evaluated for impairment	919	921
Carrying value of loans and leases collectively evaluated for impairment	54,659	64,066
Total	55,578	64,987
Residential mortgage
Impaired Loans
Allowance on loans and leases individually evaluated for impairment	72	73
Allowance on loans and leases collectively evaluated for impairment	242	312
Total	314	385	219	179
Carrying value of loans and leases individually evaluated for impairment	1,814	1,817
Carrying value of loans and leases collectively evaluated for impairment	33,681	38,455
Total	35,495	40,272
Construction
Impaired Loans
Allowance on loans and leases collectively evaluated for impairment	2,311	2,421
Total	2,311	2,421	2,381	2,362
Carrying value of loans and leases individually evaluated for impairment	1,206	1,206
Carrying value of loans and leases collectively evaluated for impairment	133,395	139,040
Total	134,601	140,246
Commercial and industrial, including leases
Impaired Loans
Allowance on loans and leases individually evaluated for impairment	1,562	1,563
Allowance on loans and leases collectively evaluated for impairment	3,724	3,868
Total	5,286	5,431	3,169	2,684
Carrying value of loans and leases individually evaluated for impairment	4,339	4,645
Carrying value of loans and leases collectively evaluated for impairment	257,082	257,105
Total	261,421	261,750
Small business loans
Impaired Loans
Allowance on loans and leases individually evaluated for impairment	376
Allowance on loans and leases collectively evaluated for impairment	1,544	1,259
Total	1,920	1,259	725	509
Carrying value of loans and leases individually evaluated for impairment	1,087	185
Carrying value of loans and leases collectively evaluated for impairment	61,286	49,357
Total	62,373	49,542
Paycheck Protection Program loans ("PPP")
Impaired Loans
Carrying value of loans and leases collectively evaluated for impairment	230,847	203,543
Total	230,847	203,543
MainStreet Lending Program Loans ("PPP")
Impaired Loans
Carrying value of loans and leases collectively evaluated for impairment	583	580
Total	583	580
Consumer
Impaired Loans
Allowance on loans and leases collectively evaluated for impairment	4	4
Total	4	4	4	6
Carrying value of loans and leases collectively evaluated for impairment	469	511
Total	469	511
Leases
Impaired Loans
Allowance on loans and leases collectively evaluated for impairment	576	382
Total	576	382	$ 4	$ 5
Carrying value of loans and leases individually evaluated for impairment	131
Carrying value of loans and leases collectively evaluated for impairment	46,539	31,040
Total	$ 46,670	$ 31,040

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