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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, 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
Dec. 31, 2014
Dec. 31, 2013
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance $ 1,358,808                    
Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance   $ 1,001,801                  
All outstanding liabilities for unpaid losses and loss settlement expenses before 2014, net of reinsurance   13,905                  
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 678,815 678,815                  
Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 1,395,891                    
All outstanding liabilities for unpaid losses and loss settlement expenses before 2014, net of reinsurance 1,453                    
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 147,570                    
Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 1,608,325                    
All outstanding liabilities for unpaid losses and loss settlement expenses before 2014, net of reinsurance 345                    
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 281,722                    
Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 383,875                    
All outstanding liabilities for unpaid losses and loss settlement expenses before 2014, net of reinsurance 13,649                    
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 73,014                    
Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 402,305                    
All outstanding liabilities for unpaid losses and loss settlement expenses before 2014, net of reinsurance 340                    
Liabilities for unpaid losses and loss settlement expenses, net of reinsurance 7,568                    
2014 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance   105,035 $ 103,075 $ 102,042 $ 96,509 $ 93,060 $ 83,109 $ 70,363 $ 50,211 $ 29,679 $ 10,207
2014 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 128,403 128,033 127,883 126,307 125,745 123,697 122,370 116,750 113,663 84,456  
2014 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 119,087 118,985 117,770 116,843 113,751 109,682 99,922 87,590 68,033 45,704  
2014 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 47,548 47,192 46,664 46,299 45,825 45,193 42,964 38,441 30,289 13,965  
2014 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 52,615 52,565 52,526 52,519 52,543 52,018 51,837 49,710 47,912 37,055  
2015 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance   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 104,638 104,339 104,127 103,975 104,115 101,367 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 137,085 137,075 135,462 134,100 129,317 118,395 99,201 78,225 50,782    
2015 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 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 40,029 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   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 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 172,928 171,380 168,950 164,341 148,224 128,156 103,528 66,013      
2016 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 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 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   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 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 228,749 223,076 212,947 197,893 166,170 126,644 81,311        
2017 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 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 58,377 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   158,851 130,943 105,515 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 145,021 141,841 137,794 133,703 123,559 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 244,284 235,519 211,123 187,405 138,092 81,572          
2018 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 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 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   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 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 264,151 246,800 205,614 153,244 91,919            
2019 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 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 56,852 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   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 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 161,798 138,158 109,686 67,660              
2020 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 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 71,416 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   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 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 128,283 99,116 64,381                
2021 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 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 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   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 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 95,785 62,477                  
2022 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 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 2,128 551                  
2023 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance   $ 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 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 56,175                    
2023 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance 10,227                    
2023 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Cumulative paid losses and allocated loss settlement expenses, net of reinsurance $ 297