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Fair Value Measurements - Schedule of Changes in Fair Value of Securities Using Level 3 Inputs (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | $ 551,689 |
Fair value, ending balance | 566,725 |
Investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 551,689 | $ 349,255
Purchases | 126,288 | 137,582
Sales | 0 | 0
Issuances | 0 | 0
Settlements | (50,895) | (11,804)
Transfers into Level 3 | 48,567 | 19,427
Transfers out of Level 3 | (126,837) | (12,826)
Fair value, ending balance | 566,725 | 478,806
Change in unrealized gains (losses) for the period included in earnings for assets held at period end | 479 | 84
Change in unrealized gains (losses) for the period included in OCI for assets held at period end | 18,058 | (3,006)
Investments | Net realized and unrealized gains (losses) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in net income | 275 | 84
Investments | Net investment income earned |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in net income | (253) | 83
Investments | Other Comprehensive Income (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in OCI | 17,891 | (2,995)
Obligations of states and political subdivisions |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 7,834 | 6,661
Purchases | 0 | 0
Sales | 0 | 0
Issuances | 0 | 0
Settlements | (68) | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Fair value, ending balance | 7,731 | 6,643
Change in unrealized gains (losses) for the period included in earnings for assets held at period end | (60) | 62
Change in unrealized gains (losses) for the period included in OCI for assets held at period end | 25 | (80)
Obligations of states and political subdivisions | Net realized and unrealized gains (losses) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in net income | (60) | 62
Obligations of states and political subdivisions | Net investment income earned |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in net income | 0 | 0
Obligations of states and political subdivisions | Other Comprehensive Income (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in OCI | 25 | (80)
Corporate securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 297,332 | 187,980
Purchases | 22,611 | 77,567
Sales | 0 | 0
Issuances | 0 | 0
Settlements | (22,005) | (7,437)
Transfers into Level 3 | 28,896 | 2,238
Transfers out of Level 3 | (91,124) | 0
Fair value, ending balance | 249,539 | 260,479
Change in unrealized gains (losses) for the period included in earnings for assets held at period end | 568 | 289
Change in unrealized gains (losses) for the period included in OCI for assets held at period end | 13,305 | (528)
Corporate securities | Net realized and unrealized gains (losses) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in net income | 556 | 289
Corporate securities | Net investment income earned |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in net income | (443) | 359
Corporate securities | Other Comprehensive Income (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in OCI | 13,716 | (517)
CLO and other ABS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 245,313 | 153,342
Purchases | 98,789 | 60,015
Sales | 0 | 0
Issuances | 0 | 0
Settlements | (28,560) | (4,343)
Transfers into Level 3 | 19,671 | 14,148
Transfers out of Level 3 | (31,002) | (10,200)
Fair value, ending balance | 308,218 | 210,407
Change in unrealized gains (losses) for the period included in earnings for assets held at period end | (242) | (110)
Change in unrealized gains (losses) for the period included in OCI for assets held at period end | 4,636 | (2,433)
CLO and other ABS | Net realized and unrealized gains (losses) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in net income | (242) | (110)
CLO and other ABS | Net investment income earned |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in net income | 191 | (12)
CLO and other ABS | Other Comprehensive Income (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in OCI | 4,058 | (2,433)
RMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 0 |
Purchases | 4,888 |
Sales | 0 |
Issuances | 0 |
Settlements | (255) |
Transfers into Level 3 | 0 |
Transfers out of Level 3 | (4,711) |
Fair value, ending balance | 0 |
Change in unrealized gains (losses) for the period included in earnings for assets held at period end | 0 |
Change in unrealized gains (losses) for the period included in OCI for assets held at period end | 77 |
RMBS | Net realized and unrealized gains (losses) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in net income | 0 |
RMBS | Net investment income earned |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in net income | 1 |
RMBS | Other Comprehensive Income (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in OCI | 77 |
CMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 356 | 375
Purchases | 0 | 0
Sales | 0 | 0
Issuances | 0 | 0
Settlements | (7) | (24)
Transfers into Level 3 | 0 | 2,848
Transfers out of Level 3 | 0 | (2,626)
Fair value, ending balance | 362 | 344
Change in unrealized gains (losses) for the period included in earnings for assets held at period end | 0 | 0
Change in unrealized gains (losses) for the period included in OCI for assets held at period end | 15 | 35
CMBS | Net realized and unrealized gains (losses) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in net income | 0 | 0
CMBS | Net investment income earned |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in net income | (2) | (264)
CMBS | Other Comprehensive Income (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in OCI | 15 | 35
Common Stock |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 854 | 897
Purchases | 0 | 0
Sales | 0 | 0
Issuances | 0 | 0
Settlements | 0 | 0
Transfers into Level 3 | 0 | 193
Transfers out of Level 3 | 0 | 0
Fair value, ending balance | 875 | 933
Change in unrealized gains (losses) for the period included in earnings for assets held at period end | 213 | (157)
Change in unrealized gains (losses) for the period included in OCI for assets held at period end | 0 | 0
Common Stock | Net realized and unrealized gains (losses) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in net income | 21 | (157)
Common Stock | Net investment income earned |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in net income | 0 | 0
Common Stock | Other Comprehensive Income (Loss) |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Total net gains (losses) for the period included in OCI | $ 0 | $ 0

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