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Other Comprehensive Income (Loss) - Reclassifications Out of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Before-Tax Amount |  |
Net unrealized loss | $ (19,054) | $ 2,375
Tax (Expense) Benefit |  |
Net unrealized loss | 4,668 | (950)
Net of Tax |  |
Net current-period other comprehensive income | (14,386) | 1,425
Available-for-sale securities: |  |
Before-Tax Amount |  |
Change in net unrealized gain/loss during the period | (19,351) | 1,995
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | (124) | 0
Net unrealized loss | (19,475) | 1,995
Tax (Expense) Benefit |  |
Change in net unrealized gain/loss during the period | 4,741 | (798)
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | 30 | 0
Net unrealized loss | 4,771 | (798)
Net of Tax |  |
Change in net unrealized gain/loss during the period | (14,610) | 1,197
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | (94) | 0
Net current-period other comprehensive income | (14,704) | 1,197
Plan actuarial loss |  |
Before-Tax Amount |  |
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | 417 | 357
Tax (Expense) Benefit |  |
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | (102) | (143)
Net of Tax |  |
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | 315 | 214
Net retirement plan prior service (cost) credit |  |
Before-Tax Amount |  |
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | 4 | 23
Tax (Expense) Benefit |  |
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | (1) | (9)
Net of Tax |  |
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | 3 | 14
Employee benefit plans |  |
Before-Tax Amount |  |
Net unrealized loss | 421 | 380
Tax (Expense) Benefit |  |
Net unrealized loss | (103) | (152)
Net of Tax |  |
Net current-period other comprehensive income | $ 318 | $ 228

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