Accumulated Other Comprehensive Loss (Components of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands |
Sep. 30, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Accumulated Other Comprehensive Loss [Abstract] | ||
| Net unrealized loss on AFS securities, Before-Tax Amount | $ (1,254) | $ (1,646) |
| Net unrealized loss on AFS securities, Tax Effect | 427 | 560 |
| Net unrealized loss on AFS securities, Net-of-Tax Amount | (827) | (1,086) |
| Discount on AFS to HTM reclassification, Before-Tax Amount | (8) | |
| Discount on AFS to HTM reclassification, Tax Effect | 3 | |
| Discount on AFS to HTM reclassification, Net-of-Tax Amount | (5) | |
| Unrealized actuarial losses-pension, Before-Tax Amount | (1,792) | (1,792) |
| Unrealized actuarial losses-pension, Tax Effect | 609 | 609 |
| Unrealized actuarial losses-pension, Net-of-Tax Amount | (1,183) | (1,183) |
| Total of all items above, Before-Tax Amount | (3,046) | (3,446) |
| Total of all items above, Tax Effect | 1,036 | 1,172 |
| Total of all items above, Net-of-Tax Effect | $ (2,010) | $ (2,274) |