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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Before-Tax Amount |  |  |  |
Net unrealized gains/losses / Other comprehensive income (loss) | $ 296 | $ 14,272 | $ 29,824 | $ 30,449
Tax (Expense) Benefit |  |  |  |
Net unrealized gains/losses / Other comprehensive income (loss) | (73) | (3,496) | (7,308) | (7,458)
Net of Tax |  |  |  |
Other comprehensive income | 223 | 10,776 | 22,516 | 22,991
Net unrealized gain/loss |  |  |  |
Before-Tax Amount |  |  |  |
Change in net unrealized gain/loss during the period | (339) | 14,140 | 28,963 | 29,892
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income | 0 | (271) | (429) | (271)
Net unrealized gains/losses / Other comprehensive income (loss) | (339) | 13,869 | 28,534 | 29,621
Tax (Expense) Benefit |  |  |  |
Change in net unrealized gain/loss during the period | 82 | (3,464) | (7,097) | (7,322)
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income | 0 | 67 | 105 | 67
Net unrealized gains/losses / Other comprehensive income (loss) | 82 | (3,397) | (6,992) | (7,255)
Net of Tax |  |  |  |
Change in net unrealized gain/loss during the period | (257) | 10,676 | 21,866 | 22,570
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income | 0 | (204) | (324) | (204)
Other comprehensive income | (257) | 10,472 | 21,542 | 22,366
Amortization of net retirement plan actuarial gain/loss |  |  |  |
Before-Tax Amount |  |  |  |
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income | 581 | 400 | 1,183 | 821
Tax (Expense) Benefit |  |  |  |
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income | (142) | (98) | (290) | (201)
Net of Tax |  |  |  |
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income | 439 | 302 | 893 | 620
Amortization of net retirement plan prior service cost |  |  |  |
Before-Tax Amount |  |  |  |
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income | 54 | 3 | 107 | 7
Tax (Expense) Benefit |  |  |  |
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income | (13) | (1) | (26) | (2)
Net of Tax |  |  |  |
Reclassification adjustment for net realized gain on sale of available-for-sale debt securities included in net income | 41 | 2 | 81 | 5
Employee benefit plans |  |  |  |
Before-Tax Amount |  |  |  |
Net unrealized gains/losses / Other comprehensive income (loss) | 635 | 403 | 1,290 | 828
Tax (Expense) Benefit |  |  |  |
Net unrealized gains/losses / Other comprehensive income (loss) | (155) | (99) | (316) | (203)
Net of Tax |  |  |  |
Other comprehensive income | $ 480 | $ 304 | $ 974 | $ 625

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