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Allowance for Loan Losses (the Allowance) - Roll-forward of allowance by portfolio segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	$ 9,513	$ 8,053
Charge-offs	(131)	(30)
Recoveries	83	589
Provision	8,302	901
Balance at end of period	17,767	9,513
Commercial mortgage
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	3,426	3,209
Recoveries		237
Provision	4,025	(20)
Balance at end of period	7,451	3,426
Home equity lines and loans
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	342	323
Charge-offs	(90)
Recoveries	14	10
Provision	168	9
Balance at end of period	434	342
Residential mortgage
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	179	191
Recoveries	7	5
Provision	199	(17)
Balance at end of period	385	179
Construction
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	2,362	1,627
Provision	59	735
Balance at end of period	2,421	2,362
Commercial and industrial, including leases
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	2,684	2,612
Charge-offs	(31)	(30)
Recoveries	58	333
Provision	2,720	(231)
Balance at end of period	5,431	2,684
Small business loans
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	509	78
Provision	750	431
Balance at end of period	1,259	509
Consumer
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	6	3
Charge-offs	(10)
Recoveries	4	4
Provision	4	(1)
Balance at end of period	4	6
Leases
Roll-Forward of Allowance for Loan and Lease Losses by Portfolio Segment
Balance at beginning of period	5	10
Provision	377	(5)
Balance at end of period	$ 382	$ 5

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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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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Amount of expense related to estimated loss from loan and lease transactions.

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-Publisher FASB
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