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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, 2023
USD ($)
claim
Dec. 31, 2022
USD ($)
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 ($)
Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   $ 1,666,711                  
Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   1,542,008                  
Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 1,889,702                    
Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance 443,240                    
Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance 409,534                    
2014 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   112,733 $ 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 2,806                    
Cumulative development $ (6,195)                    
Cumulative number of reported claims | claim 6,838                    
2014 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 129,178 128,491 128,180 127,068 126,811 128,503 128,185 128,762 131,198 126,216  
Total of incurred but not reported liabilities plus expected development on reported claims 361                    
Cumulative development $ 2,962                    
Cumulative number of reported claims | claim 7,964                    
2014 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 121,230 121,311 119,214 120,599 121,077 120,385 118,869 113,720 106,076 107,723  
Total of incurred but not reported liabilities plus expected development on reported claims 154                    
Cumulative development $ 13,507                    
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 $ 51,773 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 391                    
Cumulative development $ (12,278)                    
Cumulative number of reported claims | claim 4,821                    
2014 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 52,975 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 9                    
Cumulative development $ (935)                    
Cumulative number of reported claims | claim 10,969                    
2015 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   137,040 136,161 132,694 131,325 129,945 127,091 120,005 125,307 $ 137,385  
Total of incurred but not reported liabilities plus expected development on reported claims $ 5,348                    
Cumulative development $ (345)                    
Cumulative number of reported claims | claim 8,005                    
2015 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 105,385 104,978 105,043 104,646 105,218 108,235 110,633 108,293 103,177    
Total of incurred but not reported liabilities plus expected development on reported claims 400                    
Cumulative development $ 2,208                    
Cumulative number of reported claims | claim 7,598                    
2015 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 137,934 137,240 136,826 137,335 137,395 138,987 132,206 129,816 125,506    
Total of incurred but not reported liabilities plus expected development on reported claims 552                    
Cumulative development $ 12,428                    
Cumulative number of reported claims | claim 20,090                    
2015 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 43,654 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 851                    
Cumulative development $ (10,134)                    
Cumulative number of reported claims | claim 5,683                    
2015 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 40,191 40,190 40,189 40,194 40,220 40,368 40,336 41,088 42,847    
Total of incurred but not reported liabilities plus expected development on reported claims 13                    
Cumulative development $ (2,656)                    
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   159,284 153,490 148,324 140,784 142,397 136,275 130,041 $ 139,144    
Total of incurred but not reported liabilities plus expected development on reported claims $ 8,576                    
Cumulative development $ 20,140                    
Cumulative number of reported claims | claim 9,627                    
2016 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 142,644 145,351 144,109 143,108 143,724 143,721 144,208 147,473      
Total of incurred but not reported liabilities plus expected development on reported claims 499                    
Cumulative development $ (4,829)                    
Cumulative number of reported claims | claim 9,879                    
2016 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 175,387 175,016 174,588 173,823 175,655 174,337 175,357 174,018      
Total of incurred but not reported liabilities plus expected development on reported claims 1,407                    
Cumulative development $ 1,369                    
Cumulative number of reported claims | claim 27,309                    
2016 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 53,617 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 1,131                    
Cumulative development $ (16,802)                    
Cumulative number of reported claims | claim 7,982                    
2016 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 45,179 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 22                    
Cumulative development $ (2,893)                    
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   174,013 173,091 159,653 156,369 152,547 139,032 $ 139,602      
Total of incurred but not reported liabilities plus expected development on reported claims $ 16,109                    
Cumulative development $ 34,411                    
Cumulative number of reported claims | claim 9,308                    
2017 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 161,611 161,456 161,232 161,693 160,945 160,240 155,139        
Total of incurred but not reported liabilities plus expected development on reported claims 573                    
Cumulative development $ 6,472                    
Cumulative number of reported claims | claim 13,519                    
2017 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 234,229 233,535 233,007 233,159 235,110 224,553 227,919        
Total of incurred but not reported liabilities plus expected development on reported claims 2,823                    
Cumulative development $ 6,310                    
Cumulative number of reported claims | claim 32,902                    
2017 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 48,074 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 1,590                    
Cumulative development $ (28,110)                    
Cumulative number of reported claims | claim 8,216                    
2017 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 58,863 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 32                    
Cumulative development $ (1,467)                    
Cumulative number of reported claims | claim 14,717                    
2018 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   207,501 197,696 187,841 176,496 172,894 $ 163,059        
Total of incurred but not reported liabilities plus expected development on reported claims $ 21,311                    
Cumulative development $ 44,442                    
Cumulative number of reported claims | claim 9,184                    
2018 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 147,058 147,356 146,010 146,378 146,950 143,280          
Total of incurred but not reported liabilities plus expected development on reported claims 1,095                    
Cumulative development $ 3,778                    
Cumulative number of reported claims | claim 10,791                    
2018 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 255,198 255,409 255,017 253,045 245,173 236,629          
Total of incurred but not reported liabilities plus expected development on reported claims 3,309                    
Cumulative development $ 18,569                    
Cumulative number of reported claims | claim 34,487                    
2018 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 54,783 53,812 56,109 59,192 67,883 71,972          
Total of incurred but not reported liabilities plus expected development on reported claims 1,102                    
Cumulative development $ (17,189)                    
Cumulative number of reported claims | claim 8,059                    
2018 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 51,115 51,457 52,062 52,715 51,721 51,639          
Total of incurred but not reported liabilities plus expected development on reported claims 113                    
Cumulative development $ (524)                    
Cumulative number of reported claims | claim 13,688                    
2019 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   186,205 179,667 183,918 169,344 $ 149,173          
Total of incurred but not reported liabilities plus expected development on reported claims $ 25,861                    
Cumulative development $ 37,032                    
Cumulative number of reported claims | claim 8,573                    
2019 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 155,850 157,667 158,475 155,482 164,030            
Total of incurred but not reported liabilities plus expected development on reported claims 2,191                    
Cumulative development $ (8,180)                    
Cumulative number of reported claims | claim 11,208                    
2019 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 282,680 282,155 289,929 291,139 279,229            
Total of incurred but not reported liabilities plus expected development on reported claims 8,017                    
Cumulative development $ 3,451                    
Cumulative number of reported claims | claim 34,757                    
2019 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 49,084 48,945 49,336 49,189 52,136            
Total of incurred but not reported liabilities plus expected development on reported claims (1,087)                    
Cumulative development $ (3,052)                    
Cumulative number of reported claims | claim 7,415                    
2019 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 57,630 57,929 58,745 58,378 59,548            
Total of incurred but not reported liabilities plus expected development on reported claims 175                    
Cumulative development $ (1,918)                    
Cumulative number of reported claims | claim 13,609                    
2020 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   179,080 162,471 158,022 $ 171,013            
Total of incurred but not reported liabilities plus expected development on reported claims $ 37,085                    
Cumulative development $ 8,067                    
Cumulative number of reported claims | claim 6,392                    
2020 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 207,256 202,929 201,391 207,207              
Total of incurred but not reported liabilities plus expected development on reported claims 4,095                    
Cumulative development $ 49                    
Cumulative number of reported claims | claim 14,629                    
2020 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 194,162 196,412 216,951 243,360              
Total of incurred but not reported liabilities plus expected development on reported claims 6,893                    
Cumulative development $ (49,198)                    
Cumulative number of reported claims | claim 24,181                    
2020 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 46,624 43,724 46,612 45,365              
Total of incurred but not reported liabilities plus expected development on reported claims 735                    
Cumulative development $ 1,259                    
Cumulative number of reported claims | claim 4,581                    
2020 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 72,531 73,204 73,761 81,206              
Total of incurred but not reported liabilities plus expected development on reported claims 588                    
Cumulative development $ (8,675)                    
Cumulative number of reported claims | claim 17,095                    
2021 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   162,879 162,359 $ 145,822              
Total of incurred but not reported liabilities plus expected development on reported claims $ 52,056                    
Cumulative development $ 17,057                    
Cumulative number of reported claims | claim 3,457                    
2021 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 157,905 169,669 156,794                
Total of incurred but not reported liabilities plus expected development on reported claims (7,859)                    
Cumulative development $ 1,111                    
Cumulative number of reported claims | claim 5,342                    
2021 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 173,708 172,599 179,880                
Total of incurred but not reported liabilities plus expected development on reported claims 10,210                    
Cumulative development $ (6,172)                    
Cumulative number of reported claims | claim 12,332                    
2021 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 39,649 42,283 45,177                
Total of incurred but not reported liabilities plus expected development on reported claims (1,731)                    
Cumulative development $ (5,528)                    
Cumulative number of reported claims | claim 1,875                    
2021 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 26,372 26,489 28,537                
Total of incurred but not reported liabilities plus expected development on reported claims 291                    
Cumulative development $ (2,165)                    
Cumulative number of reported claims | claim 2,588                    
2022 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   175,579 $ 161,826                
Total of incurred but not reported liabilities plus expected development on reported claims $ 64,525                    
Cumulative development $ 13,753                    
Cumulative number of reported claims | claim 2,878                    
2022 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 170,594 161,776                  
Total of incurred but not reported liabilities plus expected development on reported claims 18,916                    
Cumulative development $ 8,818                    
Cumulative number of reported claims | claim 4,225                    
2022 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 161,672 157,165                  
Total of incurred but not reported liabilities plus expected development on reported claims 21,313                    
Cumulative development $ 4,507                    
Cumulative number of reported claims | claim 10,136                    
2022 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 26,721 29,597                  
Total of incurred but not reported liabilities plus expected development on reported claims 1,623                    
Cumulative development $ (2,876)                    
Cumulative number of reported claims | claim 1,307                    
2022 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 2,287 1,493                  
Total of incurred but not reported liabilities plus expected development on reported claims (556)                    
Cumulative development $ 794                    
Cumulative number of reported claims | claim 64                    
2023 | Commercial other liability                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance   $ 172,398                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 118,157                    
Cumulative number of reported claims | claim 1,944                    
2023 | Commercial fire and allied                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 164,526                    
Total of incurred but not reported liabilities plus expected development on reported claims $ 59,002                    
Cumulative number of reported claims | claim 3,223                    
2023 | Commercial automobile                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 153,502                    
Total of incurred but not reported liabilities plus expected development on reported claims $ 48,545                    
Cumulative number of reported claims | claim 8,586                    
2023 | Workers' compensation                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 29,262                    
Total of incurred but not reported liabilities plus expected development on reported claims $ 6,455                    
Cumulative number of reported claims | claim 1,025                    
2023 | Personal                      
Liability for Claims and Claims Adjustment Expense [Line Items]                      
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 2,391                    
Total of incurred but not reported liabilities plus expected development on reported claims $ 2,019                    
Cumulative number of reported claims | claim 10