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Unpaid Losses and Settlement Expenses (Summary of Cumulative Paid Losses and Settlement Expenses) (Details)
item in Thousands, $ in Thousands
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
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 ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance $ 239,575                    
Cumulative paid loss and settlement expenses, net of reinsurance 193,911                    
Unpaid loss and settlement expense, net of reinsurance 45,802                    
Property Line [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance 88,528                    
Cumulative paid loss and settlement expenses, net of reinsurance 85,992                    
Unpaid loss and settlement expense, net of reinsurance 2,526                    
Workers Compensation and Liability Lines [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance   $ 151,047                  
Cumulative paid loss and settlement expenses, net of reinsurance 107,919                    
Unpaid loss and settlement expense, net of reinsurance 43,276                    
2010 [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance 16,344 16,331 $ 16,330 $ 16,313 $ 16,480 $ 16,819 $ 16,363 $ 15,514 $ 16,144 $ 16,119  
Total IBNR plus expected development on reported claims $ 21                    
Cumulative number of reported claims | item 1,580                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 16,303 16,219 16,068 15,940 15,551 14,813 13,202 10,584 7,979 4,414  
2010 [Member] | Property Line [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance 4,860 4,862 4,899 4,891 5,006 5,118 4,992 4,831 5,105 5,644  
Total IBNR plus expected development on reported claims $ 14                    
Cumulative number of reported claims | item 674                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 4,874 4,874 4,874 4,873 4,818 4,791 4,740 4,719 4,584 3,166  
2010 [Member] | Workers Compensation and Liability Lines [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance   11,484 11,469 11,431 11,422 11,474 11,701 11,371 10,683 11,039 $ 10,475
Total IBNR plus expected development on reported claims $ 7                    
Cumulative number of reported claims | item 906                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 11,429 11,345 11,194 11,067 10,733 10,022 8,462 5,865 3,395 1,248  
2011 [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance 18,341 18,355 18,450 18,672 18,831 18,791 18,515 18,834 19,802    
Total IBNR plus expected development on reported claims $ 7                    
Cumulative number of reported claims | item 2,011                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 18,302 18,250 18,107 17,560 16,678 14,592 12,300 10,112 6,996    
2011 [Member] | Property Line [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance $ 6,621 6,632 6,631 6,645 6,733 6,752 6,621 6,708 7,427    
Cumulative number of reported claims | item 905                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 6,620 6,623 6,623 6,589 6,556 6,520 6,459 6,351 5,327    
2011 [Member] | Workers Compensation and Liability Lines [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance   11,720 11,723 11,819 12,027 12,098 12,039 11,894 12,126 12,375  
Total IBNR plus expected development on reported claims $ 7                    
Cumulative number of reported claims | item 1,106                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 11,682 11,627 11,484 10,971 10,122 8,072 5,841 3,761 1,669    
2012 [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance 19,003 19,087 19,256 19,174 18,184 17,813 17,712 19,265      
Total IBNR plus expected development on reported claims $ 20                    
Cumulative number of reported claims | item 1,833                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 18,748 18,625 18,225 17,239 14,689 11,958 9,422 6,129      
2012 [Member] | Property Line [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance 6,167 6,455 6,411 6,482 6,546 6,406 6,374 6,143      
Total IBNR plus expected development on reported claims $ (6)                    
Cumulative number of reported claims | item 672                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 6,176 6,469 6,472 6,326 6,362 6,369 6,401 4,949      
2012 [Member] | Workers Compensation and Liability Lines [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance   12,836 12,632 12,845 12,692 11,638 11,407 11,338 13,122    
Total IBNR plus expected development on reported claims $ 26                    
Cumulative number of reported claims | item 1,161                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 12,572 12,156 11,753 10,913 8,327 5,589 3,021 1,180      
2013 [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance 22,348 22,140 22,167 21,375 21,459 21,861 21,850        
Total IBNR plus expected development on reported claims $ 90                    
Cumulative number of reported claims | item 1,798                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 21,835 21,250 20,446 18,661 15,834 12,235 8,435        
2013 [Member] | Property Line [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance 8,272 8,282 8,471 8,415 8,290 8,302 9,266        
Total IBNR plus expected development on reported claims $ 14                    
Cumulative number of reported claims | item 637                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 8,271 8,272 8,265 8,238 8,200 8,079 6,856        
2013 [Member] | Workers Compensation and Liability Lines [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance   14,076 13,858 13,696 12,960 13,169 13,559 12,584      
Total IBNR plus expected development on reported claims $ 76                    
Cumulative number of reported claims | item 1,161                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 13,564 12,978 12,181 10,423 7,634 4,156 1,579        
2014 [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance 24,781 24,698 24,601 23,139 22,330 22,250          
Total IBNR plus expected development on reported claims $ 311                    
Cumulative number of reported claims | item 1,990                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 23,707 23,027 21,398 17,261 11,718 7,782          
2014 [Member] | Property Line [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance 7,785 7,817 7,883 7,798 7,586 8,865          
Total IBNR plus expected development on reported claims $ (2)                    
Cumulative number of reported claims | item 743                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 7,795 7,795 7,796 7,746 7,631 6,243          
2014 [Member] | Workers Compensation and Liability Lines [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance   16,996 16,881 16,718 15,341 14,744 13,385        
Total IBNR plus expected development on reported claims $ 313                    
Cumulative number of reported claims | item 1,247                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 15,912 15,232 13,602 9,515 4,087 1,539          
2015 [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance 22,140 21,496 21,157 21,370 24,289            
Total IBNR plus expected development on reported claims $ 544                    
Cumulative number of reported claims | item 1,676                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 20,145 18,172 14,874 11,359 6,462            
2015 [Member] | Property Line [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance 7,654 7,634 7,717 7,494 7,693            
Total IBNR plus expected development on reported claims $ 6                    
Cumulative number of reported claims | item 563                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 7,660 7,645 7,474 7,040 5,057            
2015 [Member] | Workers Compensation and Liability Lines [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance   14,486 13,862 13,440 13,876 16,596          
Total IBNR plus expected development on reported claims $ 538                    
Cumulative number of reported claims | item 1,113                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 12,485 10,527 7,400 4,319 1,405            
2016 [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance 25,236 24,612 22,824 25,618              
Total IBNR plus expected development on reported claims $ 1,183                    
Cumulative number of reported claims | item 1,636                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 20,558 16,426 13,109 7,647              
2016 [Member] | Property Line [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance 8,381 8,372 7,981 8,941              
Total IBNR plus expected development on reported claims $ (13)                    
Cumulative number of reported claims | item 582                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 8,356 8,236 7,624 6,157              
2016 [Member] | Workers Compensation and Liability Lines [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance   16,855 16,240 14,843 16,677            
Total IBNR plus expected development on reported claims $ 1,196                    
Cumulative number of reported claims | item 1,054                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 12,202 8,190 5,485 1,490              
2017 [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance 29,583 29,371 29,801                
Total IBNR plus expected development on reported claims $ 2,698                    
Cumulative number of reported claims | item 1,769                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 22,363 18,901 11,578                
2017 [Member] | Property Line [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance 13,741 13,568 13,993                
Total IBNR plus expected development on reported claims $ 214                    
Cumulative number of reported claims | item 726                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 13,610 13,482 10,055                
2017 [Member] | Workers Compensation and Liability Lines [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance   15,842 15,803 15,808              
Total IBNR plus expected development on reported claims $ 2,484                    
Cumulative number of reported claims | item 1,043                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 8,753 5,419 1,523                
2018 [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance 28,236 29,762                  
Total IBNR plus expected development on reported claims $ 5,869                    
Cumulative number of reported claims | item 1,851                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 16,665 10,450                  
2018 [Member] | Property Line [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance 11,114 11,454                  
Total IBNR plus expected development on reported claims $ 65                    
Cumulative number of reported claims | item 736                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 11,009 8,487                  
2018 [Member] | Workers Compensation and Liability Lines [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance   17,122 18,308                
Total IBNR plus expected development on reported claims $ 5,804                    
Cumulative number of reported claims | item 1,115                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 5,656 1,963                  
2019 [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance 33,563                    
Total IBNR plus expected development on reported claims $ 10,688                    
Cumulative number of reported claims | item 1,707                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 15,285                    
2019 [Member] | Property Line [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance 13,933                    
Total IBNR plus expected development on reported claims $ (125)                    
Cumulative number of reported claims | item 795                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 11,621                    
2019 [Member] | Workers Compensation and Liability Lines [Member]                      
Claims Development [Line Items]                      
Incurred loss and settlement expenses, net of reinsurance   19,630                  
Total IBNR plus expected development on reported claims $ 10,813                    
Cumulative number of reported claims | item 912                    
Cumulative paid loss and settlement expenses, net of reinsurance $ 3,664                    
Years 2010 Through 2019 [Member]                      
Claims Development [Line Items]                      
Unpaid losses and settlement expense 45,664                    
Years 2010 Through 2019 [Member] | Property Line [Member]                      
Claims Development [Line Items]                      
Unpaid losses and settlement expense 2,536                    
Years 2010 Through 2019 [Member] | Workers Compensation and Liability Lines [Member]                      
Claims Development [Line Items]                      
Unpaid losses and settlement expense 43,128                    
Prior To 2010 [Member]                      
Claims Development [Line Items]                      
Unpaid losses and settlement expense 138                    
Prior To 2010 [Member] | Property Line [Member]                      
Claims Development [Line Items]                      
Cumulative paid loss and settlement expenses, net of reinsurance   $ 2,010 $ 2,010 $ 2,010 $ 2,010 $ 2,010 $ 2,010 $ 2,010 $ 2,010 $ 2,010  
Unpaid losses and settlement expense (10)                    
Prior To 2010 [Member] | Workers Compensation and Liability Lines [Member]                      
Claims Development [Line Items]                      
Unpaid losses and settlement expense $ 148