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Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 16,376	$ 7,774	$ 7,130
Commercial | Real estate
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	1,929	1,907	1,222
Commercial | Construction
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	0	0	0
Commercial | Other
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	9,520	964	412
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	3,875	4,060	4,475
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	1,001	843	851
Consumer
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 51	$ 0	$ 170

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Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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