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Loans - Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,476,761	$ 1,297,075	$ 1,238,283
Percentage of loans receivable	100.00%	100.00%
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 442,121	$ 372,810	353,243
Percentage of loans receivable	29.90%	28.70%
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 56,565	$ 38,084	27,304
Percentage of loans receivable	3.80%	3.00%
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 285,015	$ 218,773	196,391
Percentage of loans receivable	19.30%	16.90%
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 43,783	$ 41,288	51,128
Percentage of loans receivable	3.00%	3.20%
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 21,600	$ 14,813	17,743
Percentage of loans receivable	1.50%	1.20%
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 522,070	$ 492,455	469,145
Percentage of loans receivable	35.30%	37.90%
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 79,750	$ 92,349	98,469
Percentage of loans receivable	5.40%	7.10%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 25,857	$ 26,503	$ 24,860
Percentage of loans receivable	1.80%	2.00%

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- Definition

Reflects the break down of the gross carrying amount of all categories of loans and leases held in the portfolio, after deducting deferred income, but before deducting the allowance for losses on loans and leases as a percentage of total portfolio.

+ References

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- Definition

Amount, before allowance for credit loss, of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922352-210448

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 50
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-Topic 326
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