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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, 2025
Sep. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance $ 619,247  
Fair value, ending balance 826,753  
Investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance 619,247 $ 551,689
Purchases 182,989 126,288
Sales 0 0
Issuances 0 0
Settlements (51,152) (50,895)
Transfers into Level 3 105,359 48,567
Transfers out of Level 3 (40,098) (126,837)
Fair value, ending balance 826,753 566,725
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 468 479
Change in unrealized gains (losses) for the period included in OCI for assets held at period end 8,523 18,058
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 1,124 275
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 86 (253)
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 9,198 17,891
Obligations of States and Political Subdivisions    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance 7,426 7,834
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (72) (68)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair value, ending balance 7,630 7,731
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 144 (60)
Change in unrealized gains (losses) for the period included in OCI for assets held at period end 132 25
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 144 (60)
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 132 25
Corporate Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance 242,679 297,332
Purchases 61,531 22,611
Sales 0 0
Issuances 0 0
Settlements (13,704) (22,005)
Transfers into Level 3 19,571 28,896
Transfers out of Level 3 (295) (91,124)
Fair value, ending balance 317,267 249,539
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 285 568
Change in unrealized gains (losses) for the period included in OCI for assets held at period end 7,169 13,305
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 286 556
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 35 (443)
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 7,164 13,716
CLO and Other ABS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance 367,994 245,313
Purchases 115,903 98,789
Sales 0 0
Issuances 0 0
Settlements (35,827) (28,560)
Transfers into Level 3 85,788 19,671
Transfers out of Level 3 (39,803) (31,002)
Fair value, ending balance 496,036 308,218
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 39 (242)
Change in unrealized gains (losses) for the period included in OCI for assets held at period end 1,214 4,636
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 39 (242)
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 48 191
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 1,894 4,058
RMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance 0 0
Purchases 5,555 4,888
Sales 0 0
Issuances 0 0
Settlements (79) (255)
Transfers into Level 3 0 0
Transfers out of Level 3 0 (4,711)
Fair value, ending balance 5,483 0
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 8 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 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) 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 8 77
CMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance 340 356
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (7) (7)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair value, ending balance 337 362
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 0 15
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 4 (2)
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 0 15
Common Stock    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance 808 854
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (1,463) 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair value, ending balance 0 875
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 0 213
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 655 21
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