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Other Comprehensive Income (Loss) - Schedule of Reclassifications (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Before-Tax Amount |  |  |  |
Net unrealized gains/losses / Other comprehensive (loss) income | $ (10,164) | $ (56,977) | $ 17,443 | $ (162,787)
Tax (Expense) Benefit |  |  |  |
Net unrealized gains/losses / Other comprehensive (loss) income | 2,490 | 13,957 | (4,274) | 39,868
Net of Tax |  |  |  |
Change in net unrealized gain (loss) during the period | (13,237) | (43,449) | 7,341 | (123,854)
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income | 5,563 | 429 | 5,828 | 935
Other comprehensive loss | (7,674) | (43,020) | 13,169 | (122,919)
Net unrealized gain/loss |  |  |  |
Before-Tax Amount |  |  |  |
Change in net unrealized gain (loss) during the period | (17,531) | (57,544) | 9,724 | (164,025)
Reclassification adjustment for net realized gain (loss) on sale of available-for-sale debt securities included in net income | 7,052 | 0 | 7,052 | 0
Net unrealized gains/losses / Other comprehensive (loss) income | (10,479) | (57,544) | 16,776 | (164,025)
Tax (Expense) Benefit |  |  |  |
Change in net unrealized gain (loss) during the period | 4,294 | 14,095 | (2,383) | 40,171
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income | (1,727) | 0 | (1,727) | 0
Net unrealized gains/losses / Other comprehensive (loss) income | 2,567 | 14,095 | (4,110) | 40,171
Net of Tax |  |  |  |
Change in net unrealized gain (loss) during the period | (13,237) | (43,449) | 7,341 | (123,854)
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income | 5,325 | 0 | 5,325 | 0
Other comprehensive loss | (7,912) | (43,449) | 12,666 | (123,854)
Amortization of net retirement plan actuarial gain/loss |  |  |  |
Before-Tax Amount |  |  |  |
Reclassification adjustment for net realized gain (loss) on sale of available-for-sale debt securities included in net income | 261 | 514 | 558 | 1,129
Tax (Expense) Benefit |  |  |  |
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income | (64) | (125) | (137) | (276)
Net of Tax |  |  |  |
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income | 197 | 389 | 421 | 853
Amortization of net retirement plan prior service cost |  |  |  |
Before-Tax Amount |  |  |  |
Reclassification adjustment for net realized gain (loss) on sale of available-for-sale debt securities included in net income | 54 | 53 | 109 | 109
Tax (Expense) Benefit |  |  |  |
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income | (13) | (13) | (27) | (27)
Net of Tax |  |  |  |
Reclassification adjustment for net realized loss on sale of available-for-sale debt securities included in net income | 41 | 40 | 82 | 82
Employee benefit plans |  |  |  |
Before-Tax Amount |  |  |  |
Net unrealized gains/losses / Other comprehensive (loss) income | 315 | 567 | 667 | 1,238
Tax (Expense) Benefit |  |  |  |
Net unrealized gains/losses / Other comprehensive (loss) income | (77) | (138) | (164) | (303)
Net of Tax |  |  |  |
Other comprehensive loss | $ 238 | $ 429 | $ 503 | $ 935

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