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Loans Receivable - Age analysis of past due loans and leases (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Age Analysis of Past Due Loans and Leases
Total past due		$ 800	$ 3,704
Current		1,349,655	1,278,122
Total Accruing Loans and leases		1,350,455	1,281,826
Nonaccrual loans and leases		8,593	7,930
Loans and Leases Receivable, Gross, Total		$ 1,359,048	$ 1,289,756
Delinquency percentage		0.69%	0.90%
Loans at fair value		$ 13,590	$ 12,182
Commercial mortgage
Age Analysis of Past Due Loans and Leases
Current		517,421	482,042
Total Accruing Loans and leases		517,421	482,042
Nonaccrual loans and leases			3,061
Loans and Leases Receivable, Gross, Total		517,421	$ 485,103
Delinquency percentage			0.63%
Home equity lines and loans
Age Analysis of Past Due Loans and Leases
Current		54,659	$ 64,128
Total Accruing Loans and leases		54,659	64,128
Nonaccrual loans and leases		919	859
Loans and Leases Receivable, Gross, Total		$ 55,578	$ 64,987
Delinquency percentage		1.65%	1.32%
Residential mortgage
Age Analysis of Past Due Loans and Leases
Total past due		$ 640	$ 3,595
Current		45,730	46,134
Total Accruing Loans and leases		46,370	49,729
Nonaccrual loans and leases		2,715	2,725
Loans and Leases Receivable, Gross, Total		$ 49,085	$ 52,454
Delinquency percentage		6.84%	12.05%
Loans at fair value		$ 13,590	$ 12,182
Construction
Age Analysis of Past Due Loans and Leases
Current		134,601	140,246
Total Accruing Loans and leases		134,601	140,246
Loans and Leases Receivable, Gross, Total		134,601	140,246
Commercial and industrial, including leases
Age Analysis of Past Due Loans and Leases
Current		257,510	260,465
Total Accruing Loans and leases		257,510	260,465
Nonaccrual loans and leases		3,911	1,285
Loans and Leases Receivable, Gross, Total		$ 261,421	$ 261,750
Delinquency percentage		1.50%	0.49%
Small business loans
Age Analysis of Past Due Loans and Leases
Current		$ 61,456	$ 49,542
Total Accruing Loans and leases		61,456	49,542
Nonaccrual loans and leases		917
Loans and Leases Receivable, Gross, Total		$ 62,373	49,542
Delinquency percentage		1.47%
Paycheck Protection Program loans ("PPP")
Age Analysis of Past Due Loans and Leases
Current		$ 230,847	203,543
Total Accruing Loans and leases		230,847	203,543
Loans and Leases Receivable, Gross, Total		230,847	203,543
MainStreet Lending Program Loans ("PPP")
Age Analysis of Past Due Loans and Leases
Current		583	580
Total Accruing Loans and leases		583	580
Loans and Leases Receivable, Gross, Total		583	580
Consumer
Age Analysis of Past Due Loans and Leases
Current		469	511
Total Accruing Loans and leases		469	511
Loans and Leases Receivable, Gross, Total		469	511
Leases
Age Analysis of Past Due Loans and Leases
Total past due		160	109
Current		46,379	30,931
Total Accruing Loans and leases		46,539	31,040
Nonaccrual loans and leases		131
Loans and Leases Receivable, Gross, Total		$ 46,670	$ 31,040
Delinquency percentage		0.62%	0.35%
Current | Residential mortgage
Age Analysis of Past Due Loans and Leases
Loans at fair value		$ 12,048	$ 10,314
30-89 days past due
Age Analysis of Past Due Loans and Leases
Total past due		800	3,704
30-89 days past due | Residential mortgage
Age Analysis of Past Due Loans and Leases
Total past due		640	3,595
Loans at fair value	$ 640		958
30-89 days past due | Leases
Age Analysis of Past Due Loans and Leases
Total past due		160	109
Nonaccrual | Residential mortgage
Age Analysis of Past Due Loans and Leases
Loans at fair value		$ 902	$ 910

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