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Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 16,858	$ 14,727	$ 14,172
Commercial | Real estate
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	1,807	1,226	964
Commercial | Construction
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	256	0	0
Commercial | Other
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	6,871	8,664	9,330
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	6,840	4,062	3,042
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	1,078	760	834
Consumer
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 6	$ 15	$ 2

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