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Unpaid Losses and Settlement Expenses (Summary of Cumulative Paid Losses and Settlement Expenses) (Details)
$ 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 ($)
Dec. 31, 2012
USD ($)
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance $ 272,093                  
Cumulative paid loss and settlement expenses, net of reinsurance 224,912                  
Unpaid loss and settlement expense, net of reinsurance 47,314                  
Property Line [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 105,842                  
Cumulative paid loss and settlement expenses, net of reinsurance 103,345                  
Unpaid loss and settlement expense, net of reinsurance 2,461                  
Workers Compensation and Liability Lines [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 166,251                  
Cumulative paid loss and settlement expenses, net of reinsurance 121,567                  
Unpaid loss and settlement expense, net of reinsurance 44,853                  
2012 [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 19,071 $ 18,962 $ 19,003 $ 19,087 $ 19,256 $ 19,174 $ 18,184 $ 17,813 $ 17,712 $ 19,265
Total IBNR plus expected development on reported claims $ 10                  
Cumulative number of reported claims | claim 1,823                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 19,063 18,874 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 $ 6,161 6,161 6,167 6,455 6,411 6,482 6,546 6,406 6,374 6,143
Cumulative number of reported claims | claim 668                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 6,176 6,176 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 12,910 12,801 12,836 12,632 12,845 12,692 11,638 11,407 11,338 13,122
Total IBNR plus expected development on reported claims $ 10                  
Cumulative number of reported claims | claim 1,155                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 12,887 12,698 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 22,419 22,351 22,348 22,140 22,167 21,375 21,459 21,861 21,850  
Total IBNR plus expected development on reported claims $ 22                  
Cumulative number of reported claims | claim 1,771                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 22,245 22,011 21,836 21,252 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 8,275 8,270 8,272 8,282 8,471 8,415 8,290 8,302 9,266  
Total IBNR plus expected development on reported claims $ 11                  
Cumulative number of reported claims | claim 626                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 8,271 8,270 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 14,144 14,081 14,076 13,858 13,696 12,960 13,169 13,559 12,584  
Total IBNR plus expected development on reported claims $ 11                  
Cumulative number of reported claims | claim 1,145                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 13,974 13,741 13,565 12,980 12,181 10,423 7,634 4,156 $ 1,579  
2014 [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 24,721 24,737 24,781 24,698 24,601 23,139 22,330 22,250    
Total IBNR plus expected development on reported claims $ 98                  
Cumulative number of reported claims | claim 1,953                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 24,204 24,175 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 $ 7,792 7,784 7,785 7,817 7,883 7,798 7,586 8,865    
Cumulative number of reported claims | claim 740                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 7,803 7,801 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 16,929 16,953 16,996 16,881 16,718 15,341 14,744 13,385    
Total IBNR plus expected development on reported claims $ 98                  
Cumulative number of reported claims | claim 1,213                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 16,401 16,374 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 22,817 22,350 22,140 21,496 21,157 21,370 24,289      
Total IBNR plus expected development on reported claims $ 95                  
Cumulative number of reported claims | claim 1,648                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 21,577 20,919 20,147 18,173 14,878 11,359 6,465      
2015 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 7,635 7,636 7,654 7,634 7,717 7,494 7,693      
Total IBNR plus expected development on reported claims $ 10                  
Cumulative number of reported claims | claim 554                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 7,645 7,657 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 15,182 14,714 14,486 13,862 13,440 13,876 16,596      
Total IBNR plus expected development on reported claims $ 85                  
Cumulative number of reported claims | claim 1,094                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 13,932 13,262 12,487 10,528 7,404 4,319 $ 1,408      
2016 [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 26,740 25,951 25,236 24,612 22,824 25,618        
Total IBNR plus expected development on reported claims $ 137                  
Cumulative number of reported claims | claim 1,617                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 25,114 22,643 20,561 16,425 13,112 7,654        
2016 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 8,327 8,404 8,381 8,372 7,981 8,941        
Total IBNR plus expected development on reported claims $ 146                  
Cumulative number of reported claims | claim 576                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 8,465 8,437 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 18,413 17,547 16,855 16,240 14,843 16,677        
Total IBNR plus expected development on reported claims $ (9)                  
Cumulative number of reported claims | claim 1,041                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 16,649 14,206 12,205 8,189 5,488 $ 1,497        
2017 [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 30,689 29,802 29,583 29,371 29,801          
Total IBNR plus expected development on reported claims $ 582                  
Cumulative number of reported claims | claim 1,754                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 28,134 25,473 22,363 18,901 11,578          
2017 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 13,622 13,825 13,741 13,568 13,993          
Total IBNR plus expected development on reported claims $ 24                  
Cumulative number of reported claims | claim 715                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 13,363 13,595 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 17,067 15,977 15,842 15,803 15,808          
Total IBNR plus expected development on reported claims $ 558                  
Cumulative number of reported claims | claim 1,039                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 14,771 11,878 8,753 5,419 $ 1,523          
2018 [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 27,955 28,048 28,236 29,762            
Total IBNR plus expected development on reported claims $ 1,585                  
Cumulative number of reported claims | claim 1,851                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 23,481 20,337 16,665 10,451            
2018 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 11,030 10,966 11,114 11,454            
Total IBNR plus expected development on reported claims $ 32                  
Cumulative number of reported claims | claim 725                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 11,062 11,025 11,009 8,487            
2018 [Member] | Workers Compensation and Liability Lines [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 16,925 17,082 17,122 18,308            
Total IBNR plus expected development on reported claims $ 1,553                  
Cumulative number of reported claims | claim 1,126                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 12,419 9,312 5,656 $ 1,964            
2019 [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 34,551 33,958 33,563              
Total IBNR plus expected development on reported claims $ 3,373                  
Cumulative number of reported claims | claim 1,922                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 26,987 21,614 15,285              
2019 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 14,976 14,758 13,933              
Total IBNR plus expected development on reported claims $ 81                  
Cumulative number of reported claims | claim 833                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 14,855 14,161 11,621              
2019 [Member] | Workers Compensation and Liability Lines [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 19,575 19,200 19,630              
Total IBNR plus expected development on reported claims $ 3,292                  
Cumulative number of reported claims | claim 1,089                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 12,132 7,453 $ 3,664              
2020 [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 29,162 31,356                
Total IBNR plus expected development on reported claims $ 4,183                  
Cumulative number of reported claims | claim 1,548                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 19,367 13,055                
2020 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 15,056 13,997                
Total IBNR plus expected development on reported claims $ 258                  
Cumulative number of reported claims | claim 933                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 14,485 10,620                
2020 [Member] | Workers Compensation and Liability Lines [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 14,106 17,359                
Total IBNR plus expected development on reported claims $ 3,925                  
Cumulative number of reported claims | claim 615                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 4,882 $ 2,435                
2021 [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 33,968                  
Total IBNR plus expected development on reported claims $ 10,896                  
Cumulative number of reported claims | claim 1,390                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 14,740                  
2021 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 12,968                  
Total IBNR plus expected development on reported claims $ (9)                  
Cumulative number of reported claims | claim 701                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 11,220                  
2021 [Member] | Workers Compensation and Liability Lines [Member]                    
Claims Development [Line Items]                    
Incurred loss and settlement expenses, net of reinsurance 21,000                  
Total IBNR plus expected development on reported claims $ 10,905                  
Cumulative number of reported claims | claim 689                  
Cumulative paid loss and settlement expenses, net of reinsurance $ 3,520                  
Years 2012 Through 2021 [Member]                    
Claims Development [Line Items]                    
Unpaid losses and settlement expense 47,182                  
Years 2012 Through 2021 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Unpaid losses and settlement expense 2,497                  
Years 2012 Through 2021 [Member] | Workers Compensation and Liability Lines [Member]                    
Claims Development [Line Items]                    
Unpaid losses and settlement expense 44,685                  
Prior To 2012 [Member]                    
Claims Development [Line Items]                    
Unpaid losses and settlement expense 132                  
Prior To 2012 [Member] | Property Line [Member]                    
Claims Development [Line Items]                    
Unpaid losses and settlement expense (36)                  
Prior To 2012 [Member] | Workers Compensation and Liability Lines [Member]                    
Claims Development [Line Items]                    
Unpaid losses and settlement expense $ 168