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Other Comprehensive Income (Loss) - Tax Effect Allocated to Each Component of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Before-Tax Amount |  |  |
Other Comprehensive Income, Net unrealized losses | $ (15,813) | $ (6,097) | $ (10,176)
Tax (Expense) Benefit |  |  |
Other Comprehensive Income, Net unrealized losses | 3,879 | 1,868 | 4,068
Net of Tax |  |  |
Other comprehensive loss | (11,934) | (4,229) | (6,108)
Available-for-sale securities: |  |  |
Before-Tax Amount |  |  |
Change in net unrealized gains (losses) during the period | (14,550) | (4,442) | (7,689)
Reclassification adjustment for net realized loss on sale included in available-for-sale securities | 440 | 407 | (926)
Other Comprehensive Income, Net unrealized losses | (14,110) | (4,035) | (8,615)
Tax (Expense) Benefit |  |  |
Change in net unrealized loss during the period | 3,569 | 1,761 | 3,074
Reclassification adjustment for net realized loss on sale included in available-for-sale securities | (108) | (163) | 370
Other Comprehensive Income, Net unrealized losses | 3,461 | 1,598 | 3,444
Net of Tax |  |  |
Change in net unrealized loss during the period | (10,981) | (2,681) | (4,615)
Reclassification adjustment for net realized loss on sale included in available-for-sale securities | 332 | 244 | (556)
Other comprehensive loss | (10,649) | (2,437) | (5,171)
Plan actuarial loss |  |  |
Before-Tax Amount |  |  |
Change in net unrealized gains (losses) during the period | (3,437) | (4,549) | (2,787)
Reclassification adjustment for net realized loss on sale included in available-for-sale securities | 1,719 | 1,508 | 1,338
Tax (Expense) Benefit |  |  |
Change in net unrealized loss during the period | 843 | 1,115 | 1,114
Reclassification adjustment for net realized loss on sale included in available-for-sale securities | (421) | (603) | (535)
Net of Tax |  |  |
Change in net unrealized loss during the period | (2,594) | (3,434) | (1,673)
Reclassification adjustment for net realized loss on sale included in available-for-sale securities | 1,298 | 905 | 803
Net retirement plan prior service (cost) credit |  |  |
Before-Tax Amount |  |  |
Change in net unrealized gains (losses) during the period |  | 964 | (188)
Reclassification adjustment for net realized loss on sale included in available-for-sale securities | 15 | 15 | 76
Tax (Expense) Benefit |  |  |
Change in net unrealized loss during the period |  | (236) | 75
Reclassification adjustment for net realized loss on sale included in available-for-sale securities | (4) | (6) | (30)
Net of Tax |  |  |
Change in net unrealized loss during the period |  | 728 | (113)
Reclassification adjustment for net realized loss on sale included in available-for-sale securities | 11 | 9 | 46
Employee benefit plans |  |  |
Before-Tax Amount |  |  |
Other Comprehensive Income, Net unrealized losses | (1,703) | (2,062) | (1,561)
Tax (Expense) Benefit |  |  |
Other Comprehensive Income, Net unrealized losses | 418 | 270 | 624
Net of Tax |  |  |
Other comprehensive loss | $ (1,285) | $ (1,792) | $ (937)

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