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Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 8,344	$ 16,649	$ 15,393
Commercial |    Real estate
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	1,245	1,784	1,532
Commercial |    Construction
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	232	256	261
Commercial |    Other
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	323	6,534	7,014
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	4,685	5,899	5,892
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	1,854	2,171	694
Consumer
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 5	$ 5	$ 0

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