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Allowance for Loan Losses (the Allowance) - Roll-forward of allowance by portfolio segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	$ 18,361	$ 12,706	$ 17,767	$ 9,513
Charge-offs		(97)	(129)	(130)
Recoveries	18	8	46	51
Provision	597	3,956	1,292	7,139
Balance at end of period	18,976	16,573	18,976	16,573
Commercial mortgage
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	7,146	5,277	7,451	3,426
Provision	(604)	1,658	(909)	3,509
Balance at end of period	6,542	6,935	6,542	6,935
Home equity lines and loans
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	281	672	434	342
Charge-offs		(75)		(89)
Recoveries	1	2	5	6
Provision	(9)	(82)	(166)	258
Balance at end of period	273	517	273	517
Residential mortgage
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	324	346	385	179
Recoveries	1	1	5	5
Provision	(49)	(13)	(114)	150
Balance at end of period	276	334	276	334
Construction
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	2,241	2,019	2,421	2,362
Provision	44	463	(136)	120
Balance at end of period	2,285	2,482	2,285	2,482
Commercial and industrial
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	5,360	3,606	5,431	2,684
Charge-offs		(22)		(31)
Recoveries	15	4	33	37
Provision	239	1,450	150	2,348
Balance at end of period	5,614	5,038	5,614	5,038
Small business loans
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	2,235	747	1,259	509
Provision	864	360	1,840	598
Balance at end of period	3,099	1,107	3,099	1,107
Consumer
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	4	4	4	6
Charge-offs				(10)
Recoveries	1	1	3	3
Provision	(2)	(1)	(4)	5
Balance at end of period	3	4	3	4
Leases, net
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	770	35	382	5
Charge-offs			(129)
Provision	114	121	631	151
Balance at end of period	$ 884	$ 156	$ 884	$ 156

X

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

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-Section 50
-Paragraph 11B
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Amount of expense related to estimated loss from loan and lease transactions.

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