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Liability for Unpaid Losses and Loss Adjustment Expense - Claims Development (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
claim
Dec. 31, 2017
USD ($)
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]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 171,884 $ 163,738                
Property and Casualty, Commercial Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 266,908                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 57,717 49,810                
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 209,191                  
Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 200,766                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 16,929 12,384                
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 183,837                  
Property and Casualty, Personal Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 1,262,006                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 97,238 101,544                
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 1,164,770                  
Short-duration Insurance Contracts, Accident Year 2009 | Property and Casualty, Commercial Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 3,484 3,486 $ 3,489 $ 3,490 $ 3,459 $ 4,182 $ 3,853 $ 4,054 $ 5,233 $ 11,323
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 383                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 3,483 3,484 3,485 3,471 3,446 3,920 3,415 3,410 3,616 1,639
Short-duration Insurance Contracts, Accident Year 2009 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 10,007 10,007 10,009 9,837 9,844 9,902 10,026 10,093 10,135 10,610
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 1,072                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 10,007 10,007 10,009 9,688 9,570 9,471 9,062 8,470 7,507 4,807
Short-duration Insurance Contracts, Accident Year 2009 | Property and Casualty, Personal Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 44,574 44,617 44,996 44,959 45,116 45,316 45,583 45,515 46,089 46,952
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 4,152                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 44,572 44,577 44,966 44,898 44,737 44,413 44,114 43,149 41,134 $ 31,525
Short-duration Insurance Contracts, Accident Year 2010 | Property and Casualty, Commercial Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 4,112 4,112 4,112 4,160 4,291 5,489 5,374 5,603 12,134  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 580                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 4,112 4,112 4,112 3,909 3,909 3,966 3,461 3,127 1,968  
Short-duration Insurance Contracts, Accident Year 2010 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 11,072 11,072 11,072 11,105 11,020 11,126 10,733 11,042 9,911  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 1,096                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 11,072 11,072 11,073 10,327 10,242 10,182 9,036 8,128 4,346  
Short-duration Insurance Contracts, Accident Year 2010 | Property and Casualty, Personal Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 51,796 51,836 51,674 51,841 51,685 52,239 51,862 51,292 51,144  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 11                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 5,095                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 51,484 51,435 51,163 50,704 50,215 49,256 46,711 43,932 $ 32,993  
Short-duration Insurance Contracts, Accident Year 2011 | Property and Casualty, Commercial Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 9,026 8,985 9,030 9,142 8,972 10,197 11,280 12,702    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 54                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 757                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 8,972 8,933 8,851 8,825 7,846 7,605 6,241 3,541    
Short-duration Insurance Contracts, Accident Year 2011 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 10,741 10,741 10,740 10,575 10,630 10,896 11,022 11,126    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 1,171                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 10,741 10,741 10,740 10,128 9,837 9,444 8,013 4,587    
Short-duration Insurance Contracts, Accident Year 2011 | Property and Casualty, Personal Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 60,522 60,288 60,215 59,517 58,047 57,670 56,840 53,878    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 72                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 6,224                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 60,289 59,806 59,461 58,069 55,532 52,412 48,558 $ 36,419    
Short-duration Insurance Contracts, Accident Year 2012 | Property and Casualty, Commercial Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 12,641 12,615 8,671 9,771 9,690 9,540 11,404      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 65                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 802                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 12,576 12,575 8,552 7,543 6,893 6,942 4,583      
Short-duration Insurance Contracts, Accident Year 2012 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 9,140 9,138 9,147 9,412 9,350 9,651 10,760      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 3                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 1,001                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 9,137 9,126 9,124 8,626 8,242 7,631 5,112      
Short-duration Insurance Contracts, Accident Year 2012 | Property and Casualty, Personal Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 67,934 69,064 69,000 68,388 68,923 69,438 65,112      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 159                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 11,046                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 67,487 68,655 68,337 66,739 64,675 60,640 $ 42,699      
Short-duration Insurance Contracts, Accident Year 2013 | Property and Casualty, Commercial Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 7,426 7,573 8,382 11,826 6,420 8,359        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 163                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 740                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 7,256 7,254 7,248 5,317 5,127 2,958        
Short-duration Insurance Contracts, Accident Year 2013 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 5,843 5,857 5,736 5,401 5,817 6,657        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 41                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 508                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 5,802 5,626 5,566 4,811 4,496 2,925        
Short-duration Insurance Contracts, Accident Year 2013 | Property and Casualty, Personal Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 66,709 92,792 92,702 93,041 94,755 98,461        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 174                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 8,373                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 65,989 91,789 90,627 89,068 85,346 $ 63,732        
Short-duration Insurance Contracts, Accident Year 2014 | Property and Casualty, Commercial Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 16,070 16,816 16,311 15,752 15,845          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 686                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 679                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 15,336 14,420 13,212 9,452 6,379          
Short-duration Insurance Contracts, Accident Year 2014 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 7,936 7,956 8,016 7,927 9,073          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 38                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 593                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 7,898 7,898 7,868 6,237 4,008          
Short-duration Insurance Contracts, Accident Year 2014 | Property and Casualty, Personal Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 104,222 132,096 131,402 130,488 130,090          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 619                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 12,822                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 102,550 129,636 125,951 119,612 $ 88,375          
Short-duration Insurance Contracts, Accident Year 2015 | Property and Casualty, Commercial Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 26,619 24,568 20,434 16,554            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2,039                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 836                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 22,983 20,645 17,139 10,188            
Short-duration Insurance Contracts, Accident Year 2015 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 19,340 19,352 19,723 19,669            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 134                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 1,009                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 18,970 18,817 18,129 11,104            
Short-duration Insurance Contracts, Accident Year 2015 | Property and Casualty, Personal Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 196,549 195,864 195,902 181,609            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1,795                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 19,152                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 192,065 188,199 174,993 $ 123,888            
Short-duration Insurance Contracts, Accident Year 2016 | Property and Casualty, Commercial Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 23,079 25,599 38,632              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2,591                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 1,194                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 19,606 16,687 10,917              
Short-duration Insurance Contracts, Accident Year 2016 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 18,222 17,898 17,053              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 202                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 52                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 17,111 16,116 12,432              
Short-duration Insurance Contracts, Accident Year 2016 | Property and Casualty, Personal Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 236,050 250,774 249,276              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 4,208                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 30,572                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 227,052 232,266 $ 170,527              
Short-duration Insurance Contracts, Accident Year 2017 | Property and Casualty, Commercial Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 102,408 76,910                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 4,254                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 4,254                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 86,775 42,744                
Short-duration Insurance Contracts, Accident Year 2017 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 77,864 46,892                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1,417                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 32                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 68,994 37,127                
Short-duration Insurance Contracts, Accident Year 2017 | Property and Casualty, Personal Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 165,375 208,537                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 9,730                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 73,280                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 158,114 $ 138,112                
Short-duration Insurance Contracts, Accident Year 2018 | Property and Casualty, Commercial Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 62,043                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 14,004                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 3,218                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 28,092                  
Short-duration Insurance Contracts, Accident Year 2018 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 30,601                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 3,491                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 5                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 24,105                  
Short-duration Insurance Contracts, Accident Year 2018 | Property and Casualty, Personal Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 268,275                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 44,495                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 35,629                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 195,168                  
Short-duration Insurance Contracts, Accident Year 2008 | Property and Casualty, Commercial Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 0                  
Short-duration Insurance Contracts, Accident Year 2008 | Other Short-duration Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 0                  
Short-duration Insurance Contracts, Accident Year 2008 | Property and Casualty, Personal Insurance Product Line                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 2