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Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Before-Tax Amount |  |  |  |
Net unrealized gains/losses / Other comprehensive income (loss) | $ 4,404 | $ (7,287) | $ 34,853 | $ (31,398)
Tax (Expense) Benefit |  |  |  |
Net unrealized gains/losses / Other comprehensive income (loss) | (1,081) | 1,786 | (8,539) | 7,692
Net of Tax |  |  |  |
Other comprehensive income (loss) | 3,323 | (5,501) | 26,314 | (23,706)
Net unrealized gain/loss |  |  |  |
Before-Tax Amount |  |  |  |
Change in net unrealized gain/loss during the period | 4,122 | (7,691) | 34,014 | (32,375)
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | (133) | (30) | (404) | (324)
Net unrealized gains/losses / Other comprehensive income (loss) | 3,989 | (7,721) | 33,610 | (32,699)
Tax (Expense) Benefit |  |  |  |
Change in net unrealized gain/loss during the period | (1,011) | 1,885 | (8,333) | 7,932
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | 32 | 7 | 99 | 79
Net unrealized gains/losses / Other comprehensive income (loss) | (979) | 1,892 | (8,234) | 8,011
Net of Tax |  |  |  |
Change in net unrealized gain/loss during the period | 3,111 | (5,806) | 25,681 | (24,443)
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | (101) | (23) | (305) | (245)
Other comprehensive income (loss) | 3,010 | (5,829) | 25,376 | (24,688)
Amortization of net retirement plan actuarial gain/loss |  |  |  |
Before-Tax Amount |  |  |  |
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | 411 | 430 | 1,232 | 1,289
Tax (Expense) Benefit |  |  |  |
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | (101) | (105) | (302) | (316)
Net of Tax |  |  |  |
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | 310 | 325 | 930 | 973
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 | 4 | 11 | 12
Tax (Expense) Benefit |  |  |  |
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | (1) | (1) | (3) | (3)
Net of Tax |  |  |  |
Reclassification adjustment for net realized gain on sale of available-for-sale securities included in net income | 3 | 3 | 8 | 9
Employee benefit plans |  |  |  |
Before-Tax Amount |  |  |  |
Net unrealized gains/losses / Other comprehensive income (loss) | 415 | 434 | 1,243 | 1,301
Tax (Expense) Benefit |  |  |  |
Net unrealized gains/losses / Other comprehensive income (loss) | (102) | (106) | (305) | (319)
Net of Tax |  |  |  |
Other comprehensive income (loss) | $ 313 | $ 328 | $ 938 | $ 982

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