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Reserves for Losses and Loss Settlement Expenses - Incurred Claims and Allocated Claim Adjustment Expenses (Details)
claim in Thousands, $ in Thousands
Dec. 31, 2022
USD ($)
claim
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   $ 1,531,130                  
Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   1,472,920                  
Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   1,835,971                  
Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   464,235                  
Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   444,127                  
2013 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   92,809 $ 94,808 $ 85,999 $ 86,082 $ 88,816 $ 85,399 $ 86,119 $ 90,502 $ 91,460 $ 104,982
Total of incurred but not reported liabilities plus expected development on reported claims $ 1,677                    
Cumulative development $ (12,173)                    
Cumulative number of reported claims | claim 6,556                    
2013 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   93,246 93,498 92,855 92,988 93,858 93,826 92,212 91,498 88,550 91,521
Total of incurred but not reported liabilities plus expected development on reported claims $ 47                    
Cumulative development $ 1,725                    
Cumulative number of reported claims | claim 6,679                    
2013 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   105,130 106,288 106,140 104,886 105,248 104,980 103,726 102,943 98,037 104,356
Total of incurred but not reported liabilities plus expected development on reported claims $ 146                    
Cumulative development $ 774                    
Cumulative number of reported claims | claim 15,530                    
2013 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   49,913 49,801 50,349 50,984 51,753 52,761 54,584 56,369 62,579 64,048
Total of incurred but not reported liabilities plus expected development on reported claims $ 248                    
Cumulative development $ (14,135)                    
Cumulative number of reported claims | claim 4,263                    
2013 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   36,466 36,466 36,467 36,486 36,661 36,729 37,086 37,262 38,525 $ 39,232
Total of incurred but not reported liabilities plus expected development on reported claims $ 0                    
Cumulative development $ (2,766)                    
Cumulative number of reported claims | claim 9,253                    
2014 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   111,558 111,517 107,417 105,507 102,487 97,809 106,486 117,958 118,928  
Total of incurred but not reported liabilities plus expected development on reported claims $ 3,675                    
Cumulative development $ (7,370)                    
Cumulative number of reported claims | claim 6,772                    
2014 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   128,491 128,180 127,068 126,811 128,503 128,185 128,762 131,198 126,216  
Total of incurred but not reported liabilities plus expected development on reported claims $ 167                    
Cumulative development $ 2,275                    
Cumulative number of reported claims | claim 7,952                    
2014 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   121,311 119,214 120,599 121,077 120,385 118,869 113,720 106,076 107,723  
Total of incurred but not reported liabilities plus expected development on reported claims $ 219                    
Cumulative development $ 13,588                    
Cumulative number of reported claims | claim 17,327                    
2014 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   51,861 52,388 52,889 53,023 54,636 56,630 58,284 60,729 64,051  
Total of incurred but not reported liabilities plus expected development on reported claims $ 252                    
Cumulative development $ (12,190)                    
Cumulative number of reported claims | claim 4,812                    
2014 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   52,910 52,854 52,810 52,702 52,615 52,782 52,944 52,661 $ 53,910  
Total of incurred but not reported liabilities plus expected development on reported claims $ 16                    
Cumulative development $ (1,000)                    
Cumulative number of reported claims | claim 10,966                    
2015 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   136,161 132,694 131,325 129,945 127,091 120,005 125,307 137,386    
Total of incurred but not reported liabilities plus expected development on reported claims $ 7,358                    
Cumulative development $ (1,225)                    
Cumulative number of reported claims | claim 7,922                    
2015 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   104,978 105,043 104,646 105,218 108,235 110,633 108,293 103,177    
Total of incurred but not reported liabilities plus expected development on reported claims $ 107                    
Cumulative development $ 1,801                    
Cumulative number of reported claims | claim 7,596                    
2015 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   137,240 136,826 137,335 137,395 138,987 132,206 129,816 125,506    
Total of incurred but not reported liabilities plus expected development on reported claims $ 133                    
Cumulative development $ 11,734                    
Cumulative number of reported claims | claim 20,088                    
2015 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   43,209 43,751 44,706 46,019 46,682 51,003 55,578 53,788    
Total of incurred but not reported liabilities plus expected development on reported claims $ 516                    
Cumulative development $ (10,579)                    
Cumulative number of reported claims | claim 5,680                    
2015 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   40,190 40,189 40,194 40,220 40,368 40,336 41,088 $ 42,848    
Total of incurred but not reported liabilities plus expected development on reported claims $ 12                    
Cumulative development $ (2,658)                    
Cumulative number of reported claims | claim 9,553                    
2016 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   153,491 148,324 140,784 142,397 136,275 130,041 139,144      
Total of incurred but not reported liabilities plus expected development on reported claims $ 11,394                    
Cumulative development $ 14,347                    
Cumulative number of reported claims | claim 9,332                    
2016 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   145,351 144,109 143,108 143,724 143,721 144,208 147,473      
Total of incurred but not reported liabilities plus expected development on reported claims $ 331                    
Cumulative development $ (2,122)                    
Cumulative number of reported claims | claim 9,874                    
2016 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   175,016 174,588 173,823 175,657 174,337 175,357 174,018      
Total of incurred but not reported liabilities plus expected development on reported claims $ 1,138                    
Cumulative development $ 998                    
Cumulative number of reported claims | claim 27,306                    
2016 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   53,090 52,870 53,964 55,168 61,648 66,575 70,419      
Total of incurred but not reported liabilities plus expected development on reported claims $ 709                    
Cumulative development $ (17,329)                    
Cumulative number of reported claims | claim 7,973                    
2016 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   45,199 45,297 45,113 45,961 45,379 45,840 $ 48,072      
Total of incurred but not reported liabilities plus expected development on reported claims $ 40                    
Cumulative development $ (2,873)                    
Cumulative number of reported claims | claim 11,905                    
2017 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   173,092 159,653 156,369 152,547 139,032 139,602        
Total of incurred but not reported liabilities plus expected development on reported claims $ 20,797                    
Cumulative development $ 33,490                    
Cumulative number of reported claims | claim 9,203                    
2017 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   161,456 161,232 161,693 160,946 160,240 155,139        
Total of incurred but not reported liabilities plus expected development on reported claims $ 627                    
Cumulative development $ 6,317                    
Cumulative number of reported claims | claim 13,502                    
2017 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   233,535 233,007 233,159 235,110 224,553 227,919        
Total of incurred but not reported liabilities plus expected development on reported claims $ 1,573                    
Cumulative development $ 5,616                    
Cumulative number of reported claims | claim 32,895                    
2017 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   47,801 49,362 51,874 55,982 69,528 76,184        
Total of incurred but not reported liabilities plus expected development on reported claims $ 629                    
Cumulative development $ (28,383)                    
Cumulative number of reported claims | claim 8,208                    
2017 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   58,790 59,023 58,544 58,695 59,342 $ 60,330        
Total of incurred but not reported liabilities plus expected development on reported claims $ 81                    
Cumulative development $ (1,540)                    
Cumulative number of reported claims | claim 14,714                    
2018 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   197,696 187,841 176,496 172,894 163,059          
Total of incurred but not reported liabilities plus expected development on reported claims $ 22,305                    
Cumulative development $ 34,637                    
Cumulative number of reported claims | claim 9,054                    
2018 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   147,356 146,010 146,378 146,951 143,280          
Total of incurred but not reported liabilities plus expected development on reported claims $ 624                    
Cumulative development $ 4,076                    
Cumulative number of reported claims | claim 10,776                    
2018 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   255,409 255,017 253,045 245,173 236,629          
Total of incurred but not reported liabilities plus expected development on reported claims $ 4,010                    
Cumulative development $ 18,780                    
Cumulative number of reported claims | claim 34,477                    
2018 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   53,812 56,109 59,192 67,883 71,972          
Total of incurred but not reported liabilities plus expected development on reported claims $ 157                    
Cumulative development $ (18,160)                    
Cumulative number of reported claims | claim 8,045                    
2018 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   51,457 52,062 52,715 51,721 $ 51,639          
Total of incurred but not reported liabilities plus expected development on reported claims $ 108                    
Cumulative development $ (182)                    
Cumulative number of reported claims | claim 13,683                    
2019 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   179,667 183,918 169,344 149,173            
Total of incurred but not reported liabilities plus expected development on reported claims $ 33,160                    
Cumulative development $ 30,494                    
Cumulative number of reported claims | claim 8,375                    
2019 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   157,667 158,475 155,482 164,030            
Total of incurred but not reported liabilities plus expected development on reported claims $ 837                    
Cumulative development $ (6,363)                    
Cumulative number of reported claims | claim 11,185                    
2019 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   282,154 289,929 291,139 279,229            
Total of incurred but not reported liabilities plus expected development on reported claims $ 5,498                    
Cumulative development $ 2,925                    
Cumulative number of reported claims | claim 34,725                    
2019 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   48,945 49,336 49,189 52,136            
Total of incurred but not reported liabilities plus expected development on reported claims $ (899)                    
Cumulative development $ (3,191)                    
Cumulative number of reported claims | claim 7,384                    
2019 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   57,929 58,745 58,378 $ 59,547            
Total of incurred but not reported liabilities plus expected development on reported claims $ 250                    
Cumulative development $ (1,618)                    
Cumulative number of reported claims | claim 13,596                    
2020 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   162,471 158,022 171,013              
Total of incurred but not reported liabilities plus expected development on reported claims $ 43,607                    
Cumulative development $ (8,542)                    
Cumulative number of reported claims | claim 6,090                    
2020 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   202,930 201,391 207,207              
Total of incurred but not reported liabilities plus expected development on reported claims $ 2,033                    
Cumulative development $ (4,277)                    
Cumulative number of reported claims | claim 14,583                    
2020 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   196,412 216,951 243,360              
Total of incurred but not reported liabilities plus expected development on reported claims $ 4,363                    
Cumulative development $ (46,948)                    
Cumulative number of reported claims | claim 24,107                    
2020 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   43,724 46,612 45,365              
Total of incurred but not reported liabilities plus expected development on reported claims $ (948)                    
Cumulative development $ (1,641)                    
Cumulative number of reported claims | claim 4,524                    
2020 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   73,204 73,761 $ 81,206              
Total of incurred but not reported liabilities plus expected development on reported claims $ 763                    
Cumulative development $ (8,002)                    
Cumulative number of reported claims | claim 17,057                    
2021 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   162,359 145,822                
Total of incurred but not reported liabilities plus expected development on reported claims $ 63,217                    
Cumulative development $ 16,537                    
Cumulative number of reported claims | claim 3,106                    
2021 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   169,669 156,794                
Total of incurred but not reported liabilities plus expected development on reported claims $ 10,090                    
Cumulative development $ 12,875                    
Cumulative number of reported claims | claim 5,253                    
2021 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   172,599 179,880                
Total of incurred but not reported liabilities plus expected development on reported claims $ 10,183                    
Cumulative development $ (7,281)                    
Cumulative number of reported claims | claim 12,212                    
2021 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   42,283 45,177                
Total of incurred but not reported liabilities plus expected development on reported claims $ 957                    
Cumulative development $ (2,894)                    
Cumulative number of reported claims | claim 1,808                    
2021 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   26,489 $ 28,537                
Total of incurred but not reported liabilities plus expected development on reported claims $ 326                    
Cumulative development $ (2,048)                    
Cumulative number of reported claims | claim 2,565                    
2022 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   161,826                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 91,135                    
Cumulative number of reported claims | claim 2,100                    
2022 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   161,776                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 35,947                    
Cumulative number of reported claims | claim 3,797                    
2022 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   157,165                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 29,029                    
Cumulative number of reported claims | claim 9,226                    
2022 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   29,597                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 7,920                    
Cumulative number of reported claims | claim 1,151                    
2022 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   $ 1,493                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 656                    
Cumulative number of reported claims | claim 57