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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