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Fair Value Measurements - Schedule of Changes in Fair Value of Securities Using Level 3 Inputs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning of year | $ 551,689 |
Fair value, ending year | 619,247 | $ 551,689
Investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning of year | 551,689 | 349,255
Purchases | 215,034 | 201,681
Sales | 0 | 0
Issuances | 0 | 0
Settlements | (81,212) | (27,016)
Transfers into Level 3 | 50,468 | 38,485
Transfers out of Level 3 | (132,077) | (26,062)
Fair value, ending year | 619,247 | 551,689
Change in unrealized gains (losses) for the period included in earnings for assets held at period end | 687 | 476
Change in unrealized gains (losses) for the period included in OCI for assets held at period end | 14,646 | 14,652
Investments | Net realized and unrealized investment 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 | 485 | 241
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 | 222 | 326
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 | 14,638 | 14,779
Obligations of states and political subdivisions |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning of year | 7,834 | 6,661
Purchases | 0 | 0
Sales | 0 | 0
Issuances | 0 | 0
Settlements | (138) | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Fair value, ending year | 7,426 | 7,834
Change in unrealized gains (losses) for the period included in earnings for assets held at period end | (127) | 62
Change in unrealized gains (losses) for the period included in OCI for assets held at period end | (143) | 1,111
Obligations of states and political subdivisions | Net realized and unrealized investment 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 | (127) | 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 | (143) | 1,111
Corporate securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning of year | 297,332 | 187,980
Purchases | 28,226 | 97,547
Sales | 0 | 0
Issuances | 0 | 0
Settlements | (29,624) | (10,254)
Transfers into Level 3 | 30,380 | 21,297
Transfers out of Level 3 | (94,877) | (10,923)
Fair value, ending year | 242,679 | 297,332
Change in unrealized gains (losses) for the period included in earnings for assets held at period end | 891 | 419
Change in unrealized gains (losses) for the period included in OCI for assets held at period end | 10,193 | 10,634
Corporate securities | Net realized and unrealized investment 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 | 881 | 419
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 | (429) | 621
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 | 10,790 | 10,645
CLO and other ABS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning of year | 245,313 | 153,342
Purchases | 181,920 | 104,134
Sales | 0 | 0
Issuances | 0 | 0
Settlements | (51,188) | (16,737)
Transfers into Level 3 | 20,088 | 14,148
Transfers out of Level 3 | (32,489) | (12,513)
Fair value, ending year | 367,994 | 245,313
Change in unrealized gains (losses) for the period included in earnings for assets held at period end | (223) | (5)
Change in unrealized gains (losses) for the period included in OCI for assets held at period end | 4,525 | 2,858
CLO and other ABS | Net realized and unrealized investment 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 | (223) | (5)
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 | 653 | (30)
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 | 3,920 | 2,974
RMBS |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning of year | 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 year | 0 | 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 investment 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 of year | 356 | 375
Purchases | 0 | 0
Sales | 0 | 0
Issuances | 0 | 0
Settlements | (7) | (25)
Transfers into Level 3 | 0 | 2,848
Transfers out of Level 3 | 0 | (2,626)
Fair value, ending year | 340 | 356
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 | (6) | 49
CMBS | Net realized and unrealized investment 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 | (3) | (265)
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 | (6) | 49
Common Stock |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning of year | 854 | 897
Purchases | 0 | 0
Sales | 0 | 0
Issuances | 0 | 0
Settlements | 0 | 0
Transfers into Level 3 | 0 | 192
Transfers out of Level 3 | 0 | 0
Fair value, ending year | 808 | 854
Change in unrealized gains (losses) for the period included in earnings for assets held at period end | 146 | (235)
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 investment 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 | (46) | (235)
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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