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Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 14,172	$ 14,736	$ 16,376
Commercial | Real estate
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	964	752	1,929
Commercial | Construction
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	0	0	0
Commercial | Other
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	9,330	9,357	9,520
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	3,042	3,778	3,875
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	834	833	1,001
Consumer
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 2	$ 16	$ 51

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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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