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Other Comprehensive Income (Loss) - Reclassification Out of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Before-Tax Amount |  |  |  |
Net unrealized gains/losses | $ (7,287) | $ 1,514 | $ (31,398) | $ 7,320
Tax (Expense) Benefit |  |  |  |
Net unrealized gains/losses | 1,786 | (605) | 7,692 | (2,926)
Net of Tax |  |  |  |
Net current-period other comprehensive (loss) income | (5,501) | 909 | (23,706) | 4,394
Net unrealized gains/losses |  |  |  |
Before-Tax Amount |  |  |  |
Change in net unrealized gain/loss during the period | (7,691) | 712 | (32,375) | 5,756
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | (30) | 423 | (324) | 423
Net unrealized gains/losses | (7,721) | 1,135 | (32,699) | 6,179
Tax (Expense) Benefit |  |  |  |
Change in net unrealized gain/loss during the period | 1,885 | (286) | 7,932 | (2,302)
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | 7 | (169) | 79 | (169)
Net unrealized gains/losses | 1,892 | (455) | 8,011 | (2,471)
Net of Tax |  |  |  |
Change in net unrealized gain/loss during the period | (5,806) | 426 | (24,443) | 3,454
Net of tax | (23) | 254 | (245) | 254
Net current-period other comprehensive (loss) income | (5,829) | 680 | (24,688) | 3,708
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 | 430 | 376 | 1,289 | 1,130
Tax (Expense) Benefit |  |  |  |
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | (105) | (149) | (316) | (451)
Net of Tax |  |  |  |
Net of tax | 325 | 227 | 973 | 679
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 | 3 | 12 | 11
Tax (Expense) Benefit |  |  |  |
Reclassification adjustment for net realized gain on sale included in available-for-sale securities | (1) | (1) | (3) | (4)
Net of Tax |  |  |  |
Net of tax | 3 | 2 | 9 | 7
Employee benefit plans |  |  |  |
Before-Tax Amount |  |  |  |
Net unrealized gains/losses | 434 | 379 | 1,301 | 1,141
Tax (Expense) Benefit |  |  |  |
Net unrealized gains/losses | (106) | (150) | (319) | (455)
Net of Tax |  |  |  |
Net current-period other comprehensive (loss) income | $ 328 | $ 229 | $ 982 | $ 686

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