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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, 2021
USD ($)
claim
Dec. 31, 2020
USD ($)
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 $ 1,412,044                  
Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 1,404,643                  
Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 1,807,874                  
Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 483,968                  
Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 491,112                  
2012 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance 89,445 $ 89,900 $ 91,571 $ 89,731 $ 91,346 $ 92,537 $ 91,980 $ 94,195 $ 96,158 $ 100,389
Total of incurred but not reported liabilities plus expected development on reported claims 11,818                  
Cumulative development $ (10,944)                  
Cumulative number of reported claims | claim 5,905                  
2012 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 109,911 110,245 109,480 109,687 108,623 107,958 108,047 108,774 110,448 138,602
Total of incurred but not reported liabilities plus expected development on reported claims 318                  
Cumulative development $ (28,691)                  
Cumulative number of reported claims | claim 6,477                  
2012 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 96,174 96,176 96,059 96,305 96,389 96,594 95,321 94,755 90,848 100,039
Total of incurred but not reported liabilities plus expected development on reported claims 0                  
Cumulative development $ (3,865)                  
Cumulative number of reported claims | claim 14,365                  
2012 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 38,562 38,290 39,063 39,182 39,015 38,553 38,423 42,158 46,279 48,848
Total of incurred but not reported liabilities plus expected development on reported claims 228                  
Cumulative development $ (10,286)                  
Cumulative number of reported claims | claim 4,001                  
2012 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 44,178 44,160 44,158 44,165 44,352 44,715 46,150 46,403 46,199 $ 47,924
Total of incurred but not reported liabilities plus expected development on reported claims 0                  
Cumulative development $ (3,746)                  
Cumulative number of reported claims | claim 10,792                  
2013 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 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 3,962                  
Cumulative development $ (10,174)                  
Cumulative number of reported claims | claim 6,489                  
2013 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 93,498 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 62                  
Cumulative development $ 1,977                  
Cumulative number of reported claims | claim 6,675                  
2013 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 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 323                  
Cumulative development $ 1,932                  
Cumulative number of reported claims | claim 15,528                  
2013 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 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 215                  
Cumulative development $ (14,247)                  
Cumulative number of reported claims | claim 4,259                  
2013 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 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 9,252                  
2014 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 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 3,837                  
Cumulative development $ (7,411)                  
Cumulative number of reported claims | claim 6,680                  
2014 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 128,180 127,068 126,811 128,503 128,185 128,762 131,198 126,216    
Total of incurred but not reported liabilities plus expected development on reported claims 70                  
Cumulative development $ 1,964                  
Cumulative number of reported claims | claim 7,940                  
2014 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 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 381                  
Cumulative development $ 11,491                  
Cumulative number of reported claims | claim 17,326                  
2014 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 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 637                  
Cumulative development $ (11,663)                  
Cumulative number of reported claims | claim 4,804                  
2014 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 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 21                  
Cumulative development $ (1,056)                  
Cumulative number of reported claims | claim 10,963                  
2015 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 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 8,651                  
Cumulative development $ (4,692)                  
Cumulative number of reported claims | claim 7,849                  
2015 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 105,043 104,646 105,218 108,235 110,633 108,293 103,177      
Total of incurred but not reported liabilities plus expected development on reported claims 209                  
Cumulative development $ 1,866                  
Cumulative number of reported claims | claim 7,592                  
2015 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 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 271                  
Cumulative development $ 11,320                  
Cumulative number of reported claims | claim 20,085                  
2015 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 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 377                  
Cumulative development $ (10,037)                  
Cumulative number of reported claims | claim 5,678                  
2015 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 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 11                  
Cumulative development $ (2,659)                  
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 $ 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 12,640                  
Cumulative development $ 9,180                  
Cumulative number of reported claims | claim 9,132                  
2016 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 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 493                  
Cumulative development $ (3,364)                  
Cumulative number of reported claims | claim 9,860                  
2016 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 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 843                  
Cumulative development $ 570                  
Cumulative number of reported claims | claim 27,302                  
2016 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 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 571                  
Cumulative development $ (17,549)                  
Cumulative number of reported claims | claim 7,959                  
2016 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 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 39                  
Cumulative development $ (2,775)                  
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 $ 159,653 156,369 152,547 139,032 139,602          
Total of incurred but not reported liabilities plus expected development on reported claims 19,305                  
Cumulative development $ 20,051                  
Cumulative number of reported claims | claim 9,063                  
2017 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 161,232 161,693 160,946 160,240 155,139          
Total of incurred but not reported liabilities plus expected development on reported claims 676                  
Cumulative development $ 6,093                  
Cumulative number of reported claims | claim 13,478                  
2017 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 233,007 233,159 235,110 224,553 227,919          
Total of incurred but not reported liabilities plus expected development on reported claims 2,581                  
Cumulative development $ 5,088                  
Cumulative number of reported claims | claim 32,878                  
2017 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 49,362 51,874 55,982 69,528 76,184          
Total of incurred but not reported liabilities plus expected development on reported claims 688                  
Cumulative development $ (26,822)                  
Cumulative number of reported claims | claim 8,194                  
2017 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 59,023 58,544 58,695 59,342 $ 60,330          
Total of incurred but not reported liabilities plus expected development on reported claims 107                  
Cumulative development $ (1,307)                  
Cumulative number of reported claims | claim 14,709                  
2018 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 187,841 176,496 172,894 163,059            
Total of incurred but not reported liabilities plus expected development on reported claims 29,864                  
Cumulative development $ 24,782                  
Cumulative number of reported claims | claim 8,872                  
2018 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 146,010 146,378 146,951 143,280            
Total of incurred but not reported liabilities plus expected development on reported claims 1,765                  
Cumulative development $ 2,730                  
Cumulative number of reported claims | claim 10,746                  
2018 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 255,017 253,045 245,173 236,629            
Total of incurred but not reported liabilities plus expected development on reported claims 5,739                  
Cumulative development $ 18,388                  
Cumulative number of reported claims | claim 34,440                  
2018 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 56,109 59,192 67,883 71,972            
Total of incurred but not reported liabilities plus expected development on reported claims 1,075                  
Cumulative development $ (15,863)                  
Cumulative number of reported claims | claim 8,022                  
2018 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 52,062 52,715 51,721 $ 51,639            
Total of incurred but not reported liabilities plus expected development on reported claims 183                  
Cumulative development $ 423                  
Cumulative number of reported claims | claim 13,677                  
2019 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 183,918 169,344 149,173              
Total of incurred but not reported liabilities plus expected development on reported claims 37,331                  
Cumulative development $ 34,745                  
Cumulative number of reported claims | claim 8,102                  
2019 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 158,475 155,482 164,030              
Total of incurred but not reported liabilities plus expected development on reported claims 3,614                  
Cumulative development $ (5,555)                  
Cumulative number of reported claims | claim 11,146                  
2019 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 289,929 291,139 279,229              
Total of incurred but not reported liabilities plus expected development on reported claims 12,144                  
Cumulative development $ 10,700                  
Cumulative number of reported claims | claim 34,669                  
2019 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 49,336 49,189 52,136              
Total of incurred but not reported liabilities plus expected development on reported claims 1,373                  
Cumulative development $ (2,800)                  
Cumulative number of reported claims | claim 7,332                  
2019 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 58,745 58,378 $ 59,547              
Total of incurred but not reported liabilities plus expected development on reported claims 554                  
Cumulative development $ (802)                  
Cumulative number of reported claims | claim 13,576                  
2020 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 158,022 171,013                
Total of incurred but not reported liabilities plus expected development on reported claims 43,673                  
Cumulative development $ (12,991)                  
Cumulative number of reported claims | claim 5,673                  
2020 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 201,391 207,207                
Total of incurred but not reported liabilities plus expected development on reported claims 6,528                  
Cumulative development $ (5,816)                  
Cumulative number of reported claims | claim 14,354                  
2020 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 216,951 243,360                
Total of incurred but not reported liabilities plus expected development on reported claims 19,907                  
Cumulative development $ (26,409)                  
Cumulative number of reported claims | claim 23,949                  
2020 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 46,612 45,365                
Total of incurred but not reported liabilities plus expected development on reported claims 2,153                  
Cumulative development $ 1,247                  
Cumulative number of reported claims | claim 4,389                  
2020 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 73,761 $ 81,206                
Total of incurred but not reported liabilities plus expected development on reported claims 899                  
Cumulative development $ (7,445)                  
Cumulative number of reported claims | claim 16,884                  
2021 | Commercial other liability                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 145,822                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 76,825                  
Cumulative number of reported claims | claim 2,343                  
2021 | Commercial fire and allied                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 156,794                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 27,009                  
Cumulative number of reported claims | claim 4,796                  
2021 | Commercial automobile                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 179,880                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 33,802                  
Cumulative number of reported claims | claim 11,104                  
2021 | Workers' compensation                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 45,177                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 5,142                  
Cumulative number of reported claims | claim 1,623                  
2021 | Personal                    
Liability for Claims and Claims Adjustment Expense [Line Items]                    
Incurred losses and allocated loss settlement expenses, net of reinsurance $ 28,537                  
Total of incurred but not reported liabilities plus expected development on reported claims $ 2,644                  
Cumulative number of reported claims | claim 2,437