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Accumulated Other Comprehensive Income (Loss) - Rollforward of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Before Tax |  |  |  |
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized | $ 83,359 | $ (318,091) |  |
Net realized gains (losses) on disposals and non-credit related impairment losses | (5,232) | (1,978) |  |
Net unrealized gains (losses) on investments | 88,591 | (316,113) |  |
Other adjustments to comprehensive income (loss), net | 227 |  |  |
Other comprehensive income (loss) | 88,818 | (316,007) |  |
Tax Effect |  |  |  |
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized | 17,505 | (66,799) |  |
Net realized gains (losses) on disposals and non-credit related impairment losses | (1,099) | (416) |  |
Net unrealized gains (losses) on investments | 18,604 | (66,383) |  |
Other adjustments to comprehensive income (loss), net | 48 |  |  |
Other comprehensive income (loss) | 18,652 | (66,361) |  |
Net of Tax |  |  |  |
Balance at beginning and end of the period | (386,633) |  | $ (456,799) |
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized | 65,854 | (251,292) |  |
Net realized gains (losses) on disposals and non-credit related impairment losses | (4,133) | (1,562) |  |
Net unrealized gains (losses) on investments | 69,987 | (249,730) |  |
Other adjustments to other comprehensive income (loss) | 179 | 84 |  |
Other comprehensive income (loss), net of tax | 70,166 | (249,646) |  |
Other Comprehensive Income |  |  |  |
Before Tax |  |  |  |
Other adjustments to comprehensive income (loss), net | 106 |  |  |
Tax Effect |  |  |  |
Other adjustments to comprehensive income (loss), net | 22 |  |  |
Net of Tax |  |  |  |
Other adjustments to other comprehensive income (loss) | 84 |  |  |
AOCI Attributable to Parent |  |  |  |
Before Tax |  |  |  |
Balance at beginning of period | (578,228) | 152,016 |  |
Balance at end of period | (489,410) | (163,991) |  |
Tax Effect |  |  |  |
Balance at beginning of period | (121,429) | 31,923 |  |
AOCI Tax, Balance at end of period | (102,777) | (34,438) |  |
Net of Tax |  |  |  |
Balance at beginning and end of the period | (386,633) | (129,553) | $ (456,799) | $ 120,093
Net unrealized gains (losses) on investments | $ 69,987 | $ (249,730) |  |

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