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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

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