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Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 9,111	$ 16,649	$ 16,858
Commercial |    Real estate
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	1,771	1,784	1,807
Commercial |    Construction
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	307	256	256
Commercial |    Other
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	503	6,534	6,871
Municipal
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	0	0	0
Residential |    Construction
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	0	0	0
Residential |    Term
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	4,467	5,899	6,840
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	2,063	2,171	1,078
Consumer
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 0	$ 5	$ 6

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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