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Loans - Loan Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Schedule of Financing Receivables [Line Items]
Loans	$ 1,617,212	$ 1,476,761	$ 1,436,646
Percentage of loans receivable, by type	100.00%	100.00%	100.00%
Commercial |    Real estate
Schedule of Financing Receivables [Line Items]
Loans	$ 550,077	$ 442,121	$ 407,128
Percentage of loans receivable, by type	34.00%	29.90%	28.30%
Commercial |    Construction
Schedule of Financing Receivables [Line Items]
Loans	$ 73,302	$ 56,565	$ 52,038
Percentage of loans receivable, by type	4.60%	3.80%	3.60%
Commercial |    Other
Schedule of Financing Receivables [Line Items]
Loans	$ 288,121	$ 285,015	$ 309,297
Percentage of loans receivable, by type	17.80%	19.30%	21.50%
Municipal
Schedule of Financing Receivables [Line Items]
Loans	$ 40,616	$ 43,783	$ 44,110
Percentage of loans receivable, by type	2.50%	3.00%	3.10%
Residential |    Construction
Schedule of Financing Receivables [Line Items]
Loans	$ 29,358	$ 21,600	$ 16,101
Percentage of loans receivable, by type	1.80%	1.50%	1.20%
Residential |    Term
Schedule of Financing Receivables [Line Items]
Loans	$ 537,811	$ 522,070	$ 497,667
Percentage of loans receivable, by type	33.30%	35.30%	34.60%
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Loans	$ 74,594	$ 79,750	$ 82,982
Percentage of loans receivable, by type	4.60%	5.40%	5.80%
Consumer
Schedule of Financing Receivables [Line Items]
Loans	$ 23,333	$ 25,857	$ 27,323
Percentage of loans receivable, by type	1.40%	1.80%	1.90%

X

- 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.

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- Definition

Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 3B
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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