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Accumulated Other Comprehensive Income (Loss) - Rollforward of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Before Tax |  |  |  |  |  |  |  |
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized | $ (223,279) | $ (29,613) | $ (797,908) | $ (134,539) |  |  |  |
Net realized gains (losses) on disposals and non-credit related impairment losses | (4,153) | 4,099 | (10,071) | 5,684 |  |  |  |
Net decrease (increase) in expected credit losses |  | 0 |  | 918 |  |  |  |
Net unrealized gains (losses) on investments | (219,126) | (33,712) | (787,837) | (141,141) |  |  |  |
Other adjustments to comprehensive income (loss), net | 0 |  | 106 |  |  |  |  |
Other comprehensive income (loss) | (219,126) | (33,712) | (787,731) | (141,141) |  |  |  |
Tax Effect |  |  |  |  |  |  |  |
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized | (46,888) | (6,219) | (167,560) | (28,253) |  |  |  |
Net realized gains (losses) on disposals and non-credit related impairment losses | (872) | 861 | (2,115) | 1,194 |  |  |  |
Net decrease (increase) in expected credit losses |  | 0 |  | 193 |  |  |  |
Net unrealized gains (losses) on investments | (46,016) | (7,080) | (165,445) | (29,640) |  |  |  |
Other adjustments to comprehensive income (loss), net | 0 |  | 22 |  |  |  |  |
Other comprehensive income (loss) | (46,016) | (7,080) | (165,423) | (29,640) |  |  |  |
Net of Tax |  |  |  |  |  |  |  |
Balance at beginning and end of the period | (502,215) |  | (502,215) |  |  | $ 120,093 |  |
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized | (176,391) | (23,394) | (630,348) | (106,286) |  |  |  |
Net realized gains (losses) on disposals and non-credit related impairment losses | (3,281) | 3,238 | (7,956) | 4,490 |  |  |  |
Net decrease (increase) in expected credit losses | 0 | 0 | 0 | 725 |  |  |  |
Net unrealized gains (losses) on investments | (173,110) | (26,632) | (622,392) | (111,501) |  |  |  |
Other adjustments to other comprehensive income (loss) | 0 | 0 | 84 | 0 |  |  |  |
Other comprehensive income (loss), net of tax | (173,110) | (26,632) | (622,308) | (111,501) |  |  |  |
AOCI Attributable to Parent |  |  |  |  |  |  |  |
Before Tax |  |  |  |  |  |  |  |
Balance at beginning of period | (416,589) | 226,400 | 152,016 | 333,829 |  |  |  |
Balance at end of period | (635,715) | 192,688 | (635,715) | 192,688 |  |  |  |
Tax Effect |  |  |  |  |  |  |  |
Balance at beginning of period | (87,484) | 47,544 | 31,923 | 70,104 |  |  |  |
AOCI Tax, Balance at end of period | (133,500) | 40,464 | (133,500) | 40,464 |  |  |  |
Net of Tax |  |  |  |  |  |  |  |
Balance at beginning and end of the period | (502,215) | 152,224 | (502,215) | 152,224 | $ (329,105) | $ 120,093 | $ 178,856 | $ 263,725
Net unrealized gains (losses) on investments | $ (173,110) | $ (26,632) | $ (622,392) | $ (111,501) |  |  |  |

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