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Loans - Schedule of Troubled Debt Restructurings (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2015 | Dec. 31, 2016
Financing Receivable, Modifications [Line Items] |  |  |
Pre-Modification Outstanding Recorded Investment | $ 8,928 | $ 8,928 |
Post-Modification Outstanding Recorded Investment | 8,986 | 8,986 |
Recorded Investment at Period End | 7,759 |  | $ 7,820
Total nonaccruing troubled debt restructurings |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Pre-Modification Outstanding Recorded Investment | 648 | 648 |
Post-Modification Outstanding Recorded Investment | 648 | 648 |
Recorded Investment at Period End | 362 |  | 377
Total accruing troubled debt restructurings |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Pre-Modification Outstanding Recorded Investment | 8,280 | 8,280 |
Post-Modification Outstanding Recorded Investment | 8,338 | 8,338 |
Recorded Investment at Period End | 7,397 |  | 7,443
Commercial real estate | Total nonaccruing troubled debt restructurings |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Pre-Modification Outstanding Recorded Investment | 648 | 648 |
Post-Modification Outstanding Recorded Investment | 648 | 648 |
Recorded Investment at Period End | 362 |  | 377
Commercial real estate | Total accruing troubled debt restructurings |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Pre-Modification Outstanding Recorded Investment | 7,944 | 7,944 |
Post-Modification Outstanding Recorded Investment | 8,002 | 8,002 |
Recorded Investment at Period End | 7,128 |  | 7,171
Residential mortgage | Total accruing troubled debt restructurings |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Pre-Modification Outstanding Recorded Investment | 336 | 336 |
Post-Modification Outstanding Recorded Investment | 336 | $ 336 |
Recorded Investment at Period End | $ 269 |  | $ 272

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