Allowance for Loan Losses - Weighted Average Annualized Balance of Recorded Investment and Interest Income on Impaired Loans (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended |
|---|---|---|
Mar. 31, 2017 |
Dec. 31, 2016 |
|
| Financing Receivable Modifications [Line Items] | ||
| Average Recorded Investment | $ 11,154 | $ 5,899 |
| Interest Income after Impairment | 32 | 51 |
| Residential Properties | ||
| Financing Receivable Modifications [Line Items] | ||
| Average Recorded Investment | 6,041 | 1,970 |
| Interest Income after Impairment | 20 | 14 |
| Commercial Real Estate | ||
| Financing Receivable Modifications [Line Items] | ||
| Average Recorded Investment | 2,130 | 2,252 |
| Interest Income after Impairment | 11 | 17 |
| Commercial and Industrial Loans | ||
| Financing Receivable Modifications [Line Items] | ||
| Average Recorded Investment | 2,983 | 1,673 |
| Interest Income after Impairment | $ 1 | 20 |
| Consumer Loans | ||
| Financing Receivable Modifications [Line Items] | ||
| Average Recorded Investment | $ 4 |