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Loans Receivable - Age analysis of past due loans and leases (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Age Analysis of Past Due Loans and Leases
Total past due	$ 3,663	$ 3,704
Total Accruing Loans and leases	1,370,636	1,281,826
Nonaccrual loans and leases	9,193	7,930
Loans and Leases Receivable, Gross, Total	$ 1,379,829	$ 1,289,756
Delinquency percentage	0.93%	0.90%
Loans at fair value	$ 17,142	$ 12,182
Commercial mortgage
Age Analysis of Past Due Loans and Leases
Total Accruing Loans and leases	542,473	482,042
Nonaccrual loans and leases		3,061
Loans and Leases Receivable, Gross, Total	542,473	$ 485,103
Delinquency percentage		0.63%
Home equity lines and loans
Age Analysis of Past Due Loans and Leases
Total past due	65
Total Accruing Loans and leases	51,909	$ 64,128
Nonaccrual loans and leases	910	859
Loans and Leases Receivable, Gross, Total	$ 52,819	$ 64,987
Delinquency percentage	1.85%	1.32%
Residential mortgage
Age Analysis of Past Due Loans and Leases
Total past due	$ 143	$ 3,595
Total Accruing Loans and leases	57,017	49,729
Nonaccrual loans and leases	2,278	2,725
Loans and Leases Receivable, Gross, Total	$ 59,295	$ 52,454
Delinquency percentage	4.08%	12.05%
Loans at fair value	$ 17,142	$ 12,182
Construction
Age Analysis of Past Due Loans and Leases
Total Accruing Loans and leases	162,192	140,246
Loans and Leases Receivable, Gross, Total	162,192	140,246
Commercial and industrial
Age Analysis of Past Due Loans and Leases
Total past due	770
Total Accruing Loans and leases	273,887	260,465
Nonaccrual loans and leases	5,089	1,285
Loans and Leases Receivable, Gross, Total	$ 278,976	$ 261,750
Delinquency percentage	2.10%	0.49%
Small business loans
Age Analysis of Past Due Loans and Leases
Total Accruing Loans and leases	$ 89,561	$ 49,542
Nonaccrual loans and leases	916
Loans and Leases Receivable, Gross, Total	$ 90,477	49,542
Delinquency percentage	1.01%
Paycheck Protection Program loans ("PPP")
Age Analysis of Past Due Loans and Leases
Total past due	$ 2,422
Total Accruing Loans and leases	118,585	203,543
Loans and Leases Receivable, Gross, Total	$ 118,585	203,543
Delinquency percentage	2.04%
MainStreet Lending Program Loans ("PPP")
Age Analysis of Past Due Loans and Leases
Total Accruing Loans and leases	$ 592	580
Loans and Leases Receivable, Gross, Total	592	580
Consumer
Age Analysis of Past Due Loans and Leases
Total Accruing Loans and leases	427	511
Loans and Leases Receivable, Gross, Total	427	511
Leases, net
Age Analysis of Past Due Loans and Leases
Total past due	263	109
Total Accruing Loans and leases	73,993	31,040
Loans and Leases Receivable, Gross, Total	$ 73,993	$ 31,040
Delinquency percentage	0.36%	0.35%
30-89 days past due
Age Analysis of Past Due Loans and Leases
Total past due	$ 3,663	$ 3,704
30-89 days past due | Home equity lines and loans
Age Analysis of Past Due Loans and Leases
Total past due	65
30-89 days past due | Residential mortgage
Age Analysis of Past Due Loans and Leases
Total past due	143	3,595
Loans at fair value	143	958
30-89 days past due | Commercial and industrial
Age Analysis of Past Due Loans and Leases
Total past due	770
30-89 days past due | Paycheck Protection Program loans ("PPP")
Age Analysis of Past Due Loans and Leases
Total past due	2,422
30-89 days past due | Leases, net
Age Analysis of Past Due Loans and Leases
Total past due	263	109
Current
Age Analysis of Past Due Loans and Leases
Total past due	1,366,973	1,278,122
Current | Commercial mortgage
Age Analysis of Past Due Loans and Leases
Total past due	542,473	482,042
Current | Home equity lines and loans
Age Analysis of Past Due Loans and Leases
Total past due	51,844	64,128
Current | Residential mortgage
Age Analysis of Past Due Loans and Leases
Total past due	56,874	46,134
Loans at fair value	16,523	10,314
Current | Construction
Age Analysis of Past Due Loans and Leases
Total past due	162,192	140,246
Current | Commercial and industrial
Age Analysis of Past Due Loans and Leases
Total past due	273,117	260,465
Current | Small business loans
Age Analysis of Past Due Loans and Leases
Total past due	89,561	49,542
Current | Paycheck Protection Program loans ("PPP")
Age Analysis of Past Due Loans and Leases
Total past due	116,163	203,543
Current | MainStreet Lending Program Loans ("PPP")
Age Analysis of Past Due Loans and Leases
Total past due	592	580
Current | Consumer
Age Analysis of Past Due Loans and Leases
Total past due	427	511
Current | Leases, net
Age Analysis of Past Due Loans and Leases
Total past due	73,730	30,931
Nonaccrual | Residential mortgage
Age Analysis of Past Due Loans and Leases
Loans at fair value	$ 475	$ 910

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