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Loss and Loss Expense Reserves, Incurred Claims Development (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Claim
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Liabilities for claims and claims adjustment expenses, net of reinsurance $ 567,630 $ 468,954                
Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 353,460                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims 84,833                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 215,488                  
Outstanding liabilities prior to 2010 net of reinsurance 16,437                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 154,409 131,996                
Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 861,279                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims 155,816                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 510,930                  
Outstanding liabilities prior to 2010 net of reinsurance 4,799                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 355,148 268,523                
Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 86,516                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims 6,210                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 70,671                  
Outstanding liabilities prior to 2010 net of reinsurance 234                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 16,079 21,390                
Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance [1] 151,712                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 2,667                  
Short-duration Insurance Contract, Claims Settlement Period 2 years                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance [1] $ 140,066                  
Outstanding liabilities prior to 2010 net of reinsurance [1] 30                  
Liabilities for claims and claims adjustment expenses, net of reinsurance 11,676 [1] 13,329                
Accident Year 2010 [Member] | Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 19,781 19,819 $ 19,541 $ 19,195 $ 18,344 $ 18,849 $ 19,300 $ 19,400 $ 20,111 $ 20,644
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 1,294                  
Number of reported claims per year | Claim 4,226                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 17,340 17,062 16,789 16,590 15,835 14,966 13,845 11,963 9,134 3,974
Accident Year 2010 [Member] | Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 19,994 19,985 19,081 19,377 19,764 20,300 19,139 21,899 22,161 31,124
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 113                  
Number of reported claims per year | Claim 2,403                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 18,791 18,791 18,662 18,866 18,517 18,627 16,052 11,635 7,166 1,649
Accident Year 2010 [Member] | Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 11,544 11,677 11,893 11,689 10,740 9,733 7,946 7,827 4,277 2,196
Total of incurred-but-not-reported liabilities plus expected development on reported claims 35                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 11,410 11,334 11,334 11,132 9,904 7,758 5,844 3,505 729 $ 41
Accident Year 2011 [Member] | Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 26,452 26,631 26,617 27,293 25,515 26,767 26,958 26,628 26,057  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 2,085                  
Number of reported claims per year | Claim 4,547                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 23,366 22,991 22,569 21,622 20,617 18,884 15,973 11,912 4,916  
Accident Year 2011 [Member] | Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 37,795 37,852 36,076 37,122 35,805 36,894 31,633 43,832 46,829  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 32                  
Number of reported claims per year | Claim 2,902                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 37,263 36,400 35,561 34,009 33,255 30,795 23,615 11,350 1,809  
Accident Year 2011 [Member] | Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 13,018 12,725 12,744 12,735 10,779 9,859 9,017 8,314 10,492  
Total of incurred-but-not-reported liabilities plus expected development on reported claims 15                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 12,404 12,280 11,679 10,404 8,104 4,983 2,061 637 $ 50  
Accident Year 2012 [Member] | Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 25,508 26,775 27,020 25,616 24,485 24,887 25,544 23,965    
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 2,528                  
Number of reported claims per year | Claim 4,484                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 21,636 21,157 20,276 18,946 17,415 14,834 11,004 4,597    
Accident Year 2012 [Member] | Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 51,962 51,648 51,475 48,708 51,367 49,743 54,269 49,743    
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 266                  
Number of reported claims per year | Claim 3,131                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 50,882 50,750 50,036 47,601 45,303 32,942 23,252 3,086    
Accident Year 2012 [Member] | Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 16,013 14,949 16,555 14,605 10,157 5,569 9,276 10,041    
Total of incurred-but-not-reported liabilities plus expected development on reported claims 335                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 13,706 13,091 11,239 8,355 5,077 2,388 992 $ 103    
Accident Year 2013 [Member] | Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 31,066 31,131 32,553 32,121 29,913 30,638 27,619      
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 3,596                  
Number of reported claims per year | Claim 5,281                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 25,847 24,968 23,643 21,655 18,065 12,792 4,880      
Accident Year 2013 [Member] | Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 51,598 48,857 46,690 36,371 37,701 39,143 53,817      
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 546                  
Number of reported claims per year | Claim 3,751                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 49,522 46,084 44,865 34,481 25,270 15,772 5,167      
Accident Year 2013 [Member] | Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 23,474 22,213 23,256 17,694 11,618 13,034 14,370      
Total of incurred-but-not-reported liabilities plus expected development on reported claims 1,362                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 19,201 18,229 14,779 10,988 5,088 1,135 $ 123      
Accident Year 2014 [Member] | Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 31,579 31,031 33,427 34,009 36,968 36,768        
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 4,217                  
Number of reported claims per year | Claim 5,410                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 24,714 23,968 22,387 19,075 13,665 5,328        
Accident Year 2014 [Member] | Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 70,841 64,372 52,964 52,483 52,254 49,971        
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 1,268                  
Number of reported claims per year | Claim 3,323                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 68,392 57,692 45,075 28,393 9,046 4,023        
Accident Year 2014 [Member] | Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 10,721 12,749 9,837 7,259 8,825 12,675        
Total of incurred-but-not-reported liabilities plus expected development on reported claims 1,251                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 7,732 6,627 3,999 2,241 761 $ 723        
Accident Year 2015 [Member] | Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 25,436 24,948 25,889 23,115 26,277          
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 3,916                  
Number of reported claims per year | Claim 6,328                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 19,385 17,487 15,020 10,128 2,918          
Accident Year 2015 [Member] | Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 75,503 71,088 64,323 70,174 61,420          
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 2,211                  
Number of reported claims per year | Claim 3,197                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 71,697 63,133 49,267 27,582 10,923          
Accident Year 2015 [Member] | Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 8,753 10,422 7,147 7,859 11,638          
Total of incurred-but-not-reported liabilities plus expected development on reported claims 2,741                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 3,964 3,207 1,899 390 $ 10          
Accident Year 2016 [Member] | Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 30,060 29,317 29,757 35,240            
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 4,745                  
Number of reported claims per year | Claim 6,078                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 21,304 18,461 13,377 5,784            
Accident Year 2016 [Member] | Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 79,015 77,362 68,974 61,638            
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 4,913                  
Number of reported claims per year | Claim 3,737                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 70,324 52,764 30,377 6,843            
Accident Year 2016 [Member] | Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 2,993 1,522 2,482 6,368            
Total of incurred-but-not-reported liabilities plus expected development on reported claims 471                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 2,254 99 5 $ 0            
Accident Year 2017 [Member] | Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 36,211 37,731 42,387              
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 7,936                  
Number of reported claims per year | Claim 16,349                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 20,863 15,811 6,150              
Accident Year 2017 [Member] | Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 99,287 103,611 103,126              
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 19,772                  
Number of reported claims per year | Claim 5,364                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 58,173 46,529 11,415              
Accident Year 2017 [Member] | Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 0 0 0              
Total of incurred-but-not-reported liabilities plus expected development on reported claims 0                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 0 0 0              
Accident Year 2017 [Member] | Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance [1] 46,236 47,193 48,440              
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 30                  
Number of reported claims per year | Claim 10,517                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance [1] $ 46,184 46,554 39,517              
Accident Year 2018 [Member] | Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 61,530 62,973                
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 19,836                  
Number of reported claims per year | Claim 14,060                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 27,862 10,987                
Accident Year 2018 [Member] | Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 177,262 179,589                
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 28,324                  
Number of reported claims per year | Claim 8,003                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 66,575 18,689                
Accident Year 2018 [Member] | Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 0 0                
Total of incurred-but-not-reported liabilities plus expected development on reported claims 0                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 0 0                
Accident Year 2018 [Member] | Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance [1] 50,122 53,726 0              
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 234                  
Number of reported claims per year | Claim 11,108                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance [1] $ 49,685 41,631 $ 0              
Accident Year 2019 [Member] | Workers' Compensation [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 65,837                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 34,680                  
Number of reported claims per year | Claim 8,515                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 13,171                  
Accident Year 2019 [Member] | Commercial Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 198,022                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 98,371                  
Number of reported claims per year | Claim 7,286                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance $ 19,311                  
Accident Year 2019 [Member] | Professional Liability Reinsurance Assumed [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 0                  
Total of incurred-but-not-reported liabilities plus expected development on reported claims 0                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance 0                  
Accident Year 2019 [Member] | Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance [1] 55,354 0                
Total of incurred-but-not-reported liabilities plus expected development on reported claims $ 2,403                  
Number of reported claims per year | Claim 9,406                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance [1] $ 44,197 $ 0                
[1] The majority of physical damage claims settle within a two-year period. The triangles above have been abbreviated to reflect the short-tail nature of this business.