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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Other comprehensive income (loss): |  |  |
Other comprehensive (losses) gain, before tax | $ (31,306) | $ 120,238 |
Other comprehensive income (loss): |  |  |
Other comprehensive (losses) gain, tax effect | 7,818 | (17,944) |
Net of Tax |  |  |
Balance, beginning of year | 5,102,550 | 4,462,309 |
Other comprehensive income (loss): |  |  |
Total other comprehensive income (loss) | (23,488) | 102,294 | $ (433,497)
Balance, end of year | 5,603,658 | 5,102,550 | 4,462,309
Accumulated Other Comprehensive Income (Loss) |  |  |
Before Tax |  |  |
AOCI before tax, beginning of year | (322,992) | (443,230) |
Other comprehensive income (loss): |  |  |
AOCI before tax, end of year | (354,298) | (322,992) | (443,230)
Tax Effect |  |  |
AOCI tax effect, beginning of year | 42,496 | 60,440 |
Other comprehensive income (loss): |  |  |
AOCI tax effect, end of year | 50,314 | 42,496 | 60,440
Net of Tax |  |  |
Balance, beginning of year | (280,496) | (382,790) | 50,707
Other comprehensive income (loss): |  |  |
Total other comprehensive income (loss) | (23,488) | 102,294 | (433,497)
Balance, end of year | (303,984) | (280,496) | $ (382,790)
Accumulated Net Investment Gains (Losses) On Investments |  |  |
Other comprehensive income (loss): |  |  |
Unrealized holding (losses) gains arising during the year, before tax | (33,656) | 113,034 |
Less: Reclassification adjustment for losses (gains) included in net income | 2,350 | 7,204 |
Other comprehensive (losses) gain, before tax | (31,306) | 120,238 |
Other comprehensive income (loss): |  |  |
Unrealized holding (losses) gains arising during the year, tax effect | 8,260 | (16,633) |
Less: Reclassification adjustment for losses (gains) included in net income | (442) | (1,311) |
Other comprehensive (losses) gain, tax effect | 7,818 | (17,944) |
Other comprehensive income (loss): |  |  |
Unrealized holding (losses) gains arising during the year, net of tax | (25,396) | 96,401 |
Less: Reclassification adjustment for losses (gains) included in net income | 1,908 | 5,893 |
Total other comprehensive income (loss) | $ (23,488) | $ 102,294 |

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