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Reserves for Losses and Loss Settlement Expenses - Cumulative Paid Claims and Allocated Claim Adjustment Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance $ 1,500,539                  
Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 1,061,095                  
All outstanding liabilities for unpaid losses and loss settlement expenses before 2015, net of reinsurance 16,838                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 765,115                  
Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 1,389,153                  
All outstanding liabilities for unpaid losses and loss settlement expenses before 2015, net of reinsurance 1,439                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 135,251                  
Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 1,638,501                  
All outstanding liabilities for unpaid losses and loss settlement expenses before 2015, net of reinsurance 48                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 253,119                  
Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 364,556                  
All outstanding liabilities for unpaid losses and loss settlement expenses before 2015, net of reinsurance 15,978                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 74,918                  
Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 355,538                  
All outstanding liabilities for unpaid losses and loss settlement expenses before 2015, net of reinsurance 237                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 10,165                  
2015 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 129,638 $ 126,364 $ 117,734 $ 109,540 $ 104,472 $ 96,339 $ 74,292 $ 53,901 $ 27,182 $ 11,185
2015 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 104,699 104,638 104,339 104,127 103,975 104,115 101,367 95,515 90,454 67,217
2015 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 137,116 137,085 137,075 135,462 134,100 129,317 118,395 99,201 78,225 50,782
2015 | Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 41,978 41,865 41,211 41,006 40,034 39,305 38,424 35,229 27,304 12,063
2015 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 40,053 40,053 40,053 40,053 40,029 39,865 39,428 39,027 37,431 $ 29,551
2016 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 141,445 136,400 126,561 115,107 102,757 88,885 63,526 38,184 13,782  
2016 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 142,038 141,008 142,248 141,104 139,353 137,907 132,429 125,962 92,895  
2016 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 173,661 172,928 171,380 168,950 164,341 148,224 128,156 103,528 66,013  
2016 | Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 51,126 51,023 50,127 48,277 47,082 45,743 40,680 32,345 14,413  
2016 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 45,159 44,827 44,828 44,737 44,618 44,046 42,660 40,910 $ 32,999  
2017 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 148,295 138,127 128,430 111,085 91,984 70,500 43,172 17,716    
2017 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 160,487 159,456 159,286 157,512 152,219 145,900 137,058 99,484    
2017 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 228,129 228,749 223,076 212,947 197,893 166,170 126,644 81,311    
2017 | Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 46,154 45,742 45,508 43,833 41,672 38,083 31,309 14,647    
2017 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 58,597 58,377 58,206 57,824 57,169 55,982 53,111 $ 42,135    
2018 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 179,469 158,851 130,942 105,515 79,168 44,772 16,200      
2018 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 145,954 145,021 141,841 137,794 133,703 123,559 92,770      
2018 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 249,009 244,284 235,519 211,123 187,405 138,092 81,572      
2018 | Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 50,031 49,964 48,807 47,173 43,189 35,369 16,949      
2018 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 51,101 50,852 50,661 50,185 49,464 47,433 $ 37,410      
2019 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 138,236 127,650 102,510 72,179 46,986 18,221        
2019 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 153,893 151,739 150,196 142,342 136,084 100,980        
2019 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 268,355 264,151 246,800 205,614 153,244 91,919        
2019 | Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 47,308 46,101 43,044 38,382 29,668 13,582        
2019 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 56,971 56,852 56,658 54,935 52,390 $ 40,544        
2020 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 110,931 98,592 60,114 43,596 17,011          
2020 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 205,357 197,602 192,902 173,055 128,704          
2020 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 174,175 161,798 138,158 109,686 67,660          
2020 | Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 42,052 39,479 35,542 29,605 17,603          
2020 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 71,394 71,416 70,543 68,124 $ 54,181          
2021 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 90,607 59,278 33,642 12,434            
2021 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 161,705 154,242 140,406 97,451            
2021 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 146,436 128,283 99,116 64,381            
2021 | Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 36,512 34,074 29,453 17,949            
2021 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 25,764 24,889 23,829 $ 20,298            
2022 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 69,896 42,168 10,468              
2022 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 150,710 138,479 96,160              
2022 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 124,853 95,785 62,477              
2022 | Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 21,033 17,851 9,434              
2022 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 2,792 2,128 $ 551              
2023 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 41,847 9,335                
2023 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 106,083 75,304                
2023 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 85,483 56,175                
2023 | Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 18,085 10,227                
2023 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 3,089 $ 297                
2024 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 10,732                  
2024 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 58,228                  
2024 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 51,283                  
2024 | Commercial workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 10,277                  
2024 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance $ 617