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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