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Loans - Loan Portfolio (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Schedule of Financing Receivables [Line Items]
Loans	$ 1,588,264	$ 1,476,761	$ 1,451,623
Percentage of loans receivable, by type	100.00%	100.00%	100.00%
Commercial |    Real estate
Schedule of Financing Receivables [Line Items]
Loans	$ 527,415	$ 442,121	$ 397,155
Percentage of loans receivable, by type	33.20%	29.90%	27.40%
Commercial |    Construction
Schedule of Financing Receivables [Line Items]
Loans	$ 65,794	$ 56,565	$ 47,169
Percentage of loans receivable, by type	4.10%	3.80%	3.20%
Commercial |    Other
Schedule of Financing Receivables [Line Items]
Loans	$ 298,747	$ 285,015	$ 327,967
Percentage of loans receivable, by type	18.80%	19.30%	22.60%
Municipal
Schedule of Financing Receivables [Line Items]
Loans	$ 41,079	$ 43,783	$ 49,644
Percentage of loans receivable, by type	2.60%	3.00%	3.40%
Residential |    Construction
Schedule of Financing Receivables [Line Items]
Loans	$ 29,818	$ 21,600	$ 14,707
Percentage of loans receivable, by type	1.90%	1.50%	1.10%
Residential |    Term
Schedule of Financing Receivables [Line Items]
Loans	$ 523,344	$ 522,070	$ 499,693
Percentage of loans receivable, by type	33.00%	35.30%	34.40%
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Loans	$ 77,709	$ 79,750	$ 87,019
Percentage of loans receivable, by type	4.90%	5.40%	6.00%
Consumer
Schedule of Financing Receivables [Line Items]
Loans	$ 24,358	$ 25,857	$ 28,269
Percentage of loans receivable, by type	1.50%	1.80%	1.90%

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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.

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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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