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Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 14,381	$ 14,736	$ 7,434
Commercial | Real estate
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	981	752	1,814
Commercial | Construction
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	286	0	0
Commercial | Other
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	8,900	9,357	885
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	3,509	3,778	3,852
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	689	833	883
Consumer
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 16	$ 16	$ 0

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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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