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Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 10,048	$ 16,649	$ 13,736
Commercial | Real estate
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	1,748	1,784	1,468
Commercial | Construction
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	246	256	286
Commercial | Other
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	457	6,534	7,067
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	5,615	5,899	4,211
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	1,916	2,171	702
Consumer
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 66	$ 5	$ 2

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