Loans - Schedule of Troubled Debt Restructurings (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 8,592	$ 8,928
Post-Modification Outstanding Recorded Investment	8,650	8,986
Recorded Investment at Period End	7,373	7,820
Total nonaccruing troubled debt restructurings
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	4,015	648
Post-Modification Outstanding Recorded Investment	4,073	648
Recorded Investment at Period End	3,434	377
Total accruing troubled debt restructurings
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	4,577	8,280
Post-Modification Outstanding Recorded Investment	4,577	8,338
Recorded Investment at Period End	3,939	7,443
Commercial real estate | Total nonaccruing troubled debt restructurings
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	4,015	648
Post-Modification Outstanding Recorded Investment	4,073	648
Recorded Investment at Period End	3,434	377
Commercial real estate | Total accruing troubled debt restructurings
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	4,577	7,944
Post-Modification Outstanding Recorded Investment	4,577	8,002
Recorded Investment at Period End	$ 3,939	7,171
Residential mortgage | Total accruing troubled debt restructurings
Financing Receivable, Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment		336
Post-Modification Outstanding Recorded Investment		336
Recorded Investment at Period End		$ 272