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Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 13,736	$ 14,727	$ 14,283
Commercial | Real estate
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	1,468	1,226	1,021
Commercial | Construction
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	286	0	0
Commercial | Other
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	7,067	8,664	8,895
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	4,211	4,062	3,654
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	702	760	697
Consumer
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 2	$ 15	$ 16

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

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