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Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 6,941	$ 6,721	$ 10,048
Commercial |    Real estate
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	748	543	1,748
Commercial |    Construction
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	89	89	246
Commercial |    Other
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	1,675	1,481	457
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	3,577	3,593	5,615
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	852	1,015	1,916
Consumer
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 0	$ 0	$ 66

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