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Other Comprehensive Income (Loss) - Reclassification Out of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Before-Tax Amount |  |  |  |
Net unrealized gains/losses | $ (5,059) | $ 3,433 | $ (24,112) | $ 5,806
Tax (Expense) Benefit |  |  |  |
Net unrealized gains/losses | 1,240 | (1,373) | 5,907 | (2,321)
Net of Tax |  |  |  |
Net current-period other comprehensive (loss) income | (3,819) | 2,060 | (18,205) | 3,485
Net unrealized gains/losses |  |  |  |
Before-Tax Amount |  |  |  |
Change in net unrealized gain/loss during the period | (5,335) | 3,051 | (24,686) | 5,044
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | (170) | 0 | (294) | 0
Net unrealized gains/losses | (5,505) | 3,051 | (24,980) | 5,044
Tax (Expense) Benefit |  |  |  |
Change in net unrealized gain/loss during the period | 1,307 | (1,220) | 6,048 | (2,016)
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | 42 | 0 | 72 | 0
Net unrealized gains/losses | 1,349 | (1,220) | 6,120 | (2,016)
Net of Tax |  |  |  |
Change in net unrealized gain/loss during the period | (4,028) | 1,831 | (18,638) | 3,028
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | (128) | 0 | (222) | 0
Net current-period other comprehensive (loss) income | (4,156) | 1,831 | (18,860) | 3,028
Amortization of net retirement plan actuarial gain |  |  |  |
Before-Tax Amount |  |  |  |
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | 442 | 397 | 860 | 754
Tax (Expense) Benefit |  |  |  |
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | (108) | (159) | (211) | (302)
Net of Tax |  |  |  |
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | 334 | 238 | 649 | 452
Amortization of net retirement plan prior service cost |  |  |  |
Before-Tax Amount |  |  |  |
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | 4 | (15) | 8 | 8
Tax (Expense) Benefit |  |  |  |
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | (1) | 6 | (2) | (3)
Net of Tax |  |  |  |
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | 3 | (9) | 6 | 5
Employee benefit plans |  |  |  |
Before-Tax Amount |  |  |  |
Net unrealized gains/losses | 446 | 382 | 868 | 762
Tax (Expense) Benefit |  |  |  |
Net unrealized gains/losses | (109) | (153) | (213) | (305)
Net of Tax |  |  |  |
Net current-period other comprehensive (loss) income | $ 337 | $ 229 | $ 655 | $ 457

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