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Accumulated Other Comprehensive Income (Loss) - Rollforward of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Net of Tax |  |  |  |  |  |  |  |
Balance at beginning and end of the period | $ (329,105) |  | $ (329,105) |  |  | $ 120,093 |  |
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized | (202,665) | $ 64,477 | (453,957) | $ (82,892) |  |  |  |
Net realized gains (losses) on disposals and non-credit related impairment losses | (3,113) | 1,876 | (4,675) | 1,252 |  |  |  |
Net decrease (increase) in expected credit losses | 0 | 480 | 0 | 725 |  |  |  |
Net unrealized gains (losses) on investments | (199,552) | 62,121 | (449,282) | (84,869) |  |  |  |
Other adjustments to other comprehensive income (loss) | 0 | 0 | 84 | 0 |  |  |  |
Other comprehensive income (loss), net of tax | (199,552) | 62,121 | (449,198) | (84,869) |  |  |  |
Other Comprehensive Income |  |  |  |  |  |  |  |
Before Tax |  |  |  |  |  |  |  |
Balance at beginning of period | (163,991) | 147,766 | 152,016 | 333,829 |  |  |  |
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized | (256,538) | 81,617 | (574,629) | (104,926) |  |  |  |
Net realized gains (losses) on disposals and non-credit related impairment losses | (3,940) | 2,375 | (5,918) | 1,585 |  |  |  |
Net decrease (increase) in expected credit losses |  | 608 |  | 918 |  |  |  |
Net unrealized gains (losses) on investments | (252,598) | 78,634 | (568,711) | (107,429) |  |  |  |
Other adjustments to comprehensive income (loss), net | 0 |  | 106 |  |  |  |  |
Other comprehensive income (loss) | (252,598) | 78,634 | (568,605) | (107,429) |  |  |  |
Balance at end of period | (416,589) | 226,400 | (416,589) | 226,400 |  |  |  |
Tax Effect |  |  |  |  |  |  |  |
Balance at beginning of period | (34,438) | 31,031 | 31,923 | 70,104 |  |  |  |
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized | (53,873) | 17,140 | (120,672) | (22,034) |  |  |  |
Net realized gains (losses) on disposals and non-credit related impairment losses | (827) | 499 | (1,243) | 333 |  |  |  |
Net decrease (increase) in expected credit losses |  | 128 |  | 193 |  |  |  |
Net unrealized gains (losses) on investments | (53,046) | 16,513 | (119,429) | (22,560) |  |  |  |
Other adjustments to comprehensive income (loss), net | 0 |  | 22 |  |  |  |  |
Other comprehensive income (loss) | (53,046) | 16,513 | (119,407) | (22,560) |  |  |  |
AOCI Tax, Balance at end of period | (87,484) | 47,544 | (87,484) | 47,544 |  |  |  |
Net of Tax |  |  |  |  |  |  |  |
Balance at beginning and end of the period | (329,105) | 178,856 | (329,105) | 178,856 | $ (129,553) | $ 120,093 | $ 116,735 | $ 263,725
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized | (202,665) | 64,477 | (453,957) | (82,892) |  |  |  |
Net realized gains (losses) on disposals and non-credit related impairment losses | (3,113) | 1,876 | (4,675) | 1,252 |  |  |  |
Net decrease (increase) in expected credit losses |  | 480 |  | 725 |  |  |  |
Net unrealized gains (losses) on investments | (199,552) | 62,121 | (449,282) | (84,869) |  |  |  |
Other adjustments to other comprehensive income (loss) | 0 |  | 84 |  |  |  |  |
Other comprehensive income (loss), net of tax | $ (199,552) | $ 62,121 | $ (449,198) | $ (84,869) |  |  |  |

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