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Other Comprehensive Income (Loss) - Schedule of Reclassifications (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Before-Tax Amount |  |  |  |
Net unrealized gains/losses / Other comprehensive income (loss) | $ (9,552) | $ (3,728) | $ (30,490) | $ 26,098
Tax (Expense) Benefit |  |  |  |
Net unrealized gains/losses / Other comprehensive income (loss) | 2,340 | 912 | 7,470 | (6,398)
Net of Tax |  |  |  |
Change in net unrealized gain/loss during the period | (7,852) | (3,303) | (24,609) | 18,563
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income | 640 | 487 | 1,589 | 1,137
Other comprehensive (loss) income | (7,212) | (2,816) | (23,020) | 19,700
Net unrealized gain/loss |  |  |  |
Before-Tax Amount |  |  |  |
Change in net unrealized gain/loss during the period | (10,400) | (4,374) | (32,595) | 24,592
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income | 54 | 0 | (275) | (429)
Net unrealized gains/losses / Other comprehensive income (loss) | (10,346) | (4,374) | (32,870) | 24,163
Tax (Expense) Benefit |  |  |  |
Change in net unrealized gain/loss during the period | 2,548 | 1,071 | 7,986 | (6,029)
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income | (13) | 0 | 67 | 105
Net unrealized gains/losses / Other comprehensive income (loss) | 2,535 | 1,071 | 8,053 | (5,924)
Net of Tax |  |  |  |
Change in net unrealized gain/loss during the period | (7,852) | (3,303) | (24,609) | 18,563
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income | 41 | 0 | (208) | (324)
Other comprehensive (loss) income | (7,811) | (3,303) | (24,817) | 18,239
Amortization of net retirement plan actuarial gain/loss |  |  |  |
Before-Tax Amount |  |  |  |
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income | 738 | 593 | 2,213 | 1,775
Tax (Expense) Benefit |  |  |  |
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income | (181) | (146) | (542) | (435)
Net of Tax |  |  |  |
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income | 557 | 447 | 1,671 | 1,340
Amortization of net retirement plan prior service cost |  |  |  |
Before-Tax Amount |  |  |  |
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income | 56 | 53 | 167 | 160
Tax (Expense) Benefit |  |  |  |
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income | (14) | (13) | (41) | (39)
Net of Tax |  |  |  |
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income | 42 | 40 | 126 | 121
Employee benefit plans |  |  |  |
Before-Tax Amount |  |  |  |
Net unrealized gains/losses / Other comprehensive income (loss) | 794 | 646 | 2,380 | 1,935
Tax (Expense) Benefit |  |  |  |
Net unrealized gains/losses / Other comprehensive income (loss) | (195) | (159) | (583) | (474)
Net of Tax |  |  |  |
Other comprehensive (loss) income | $ 599 | $ 487 | $ 1,797 | $ 1,461

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