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Fair Value Measurements - Schedule of Changes in Fair Value of Securities Using Level 3 Inputs (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2025
Jun. 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 756,727  
Investments    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance 619,247 $ 551,689
Purchases 74,895 40,266
Sales 0 0
Issuances 0 0
Settlements (42,427) (12,067)
Transfers into Level 3 103,364 48,433
Transfers out of Level 3 (3,501) (58,958)
Fair value, ending balance 756,727 571,389
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 278 478
Change in unrealized gains (losses) for the period included in OCI for assets held at period end 3,482 1,705
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 934 470
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 56 (502)
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 4,159 2,058
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 7,530 7,654
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 117 0
Change in unrealized gains (losses) for the period included in OCI for assets held at period end 59 (112)
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 117 0
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 59 (112)
Corporate securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance 242,679 297,332
Purchases 12,684 5,261
Sales 0 0
Issuances 0 0
Settlements (9,156) (7,269)
Transfers into Level 3 17,576 28,896
Transfers out of Level 3 0 (31,434)
Fair value, ending balance 267,821 293,713
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 140 226
Change in unrealized gains (losses) for the period included in OCI for assets held at period end 3,877 850
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 141 218
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 23 (494)
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 3,874 1,203
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 62,211 30,119
Sales 0 0
Issuances 0 0
Settlements (31,732) (4,726)
Transfers into Level 3 85,788 19,537
Transfers out of Level 3 (3,501) (27,524)
Fair value, ending balance 481,037 263,720
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 21 39
Change in unrealized gains (losses) for the period included in OCI for assets held at period end (452) 969
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 21 39
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 28 (7)
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 228 969
RMBS    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value, beginning balance 0 0
Purchases 0 4,886
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair value, ending balance 0 4,886
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 0
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 0 0
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 0 0
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 (4) (4)
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair value, ending balance 339 349
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 (2) (2)
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 5 (1)
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 (2) (2)
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 1,067
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 655 213
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