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Insurance Reserves and Policyholder Funds, Liability for Unpaid Losses, Claims and Loss Adjustment Expenses (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Claim
Dec. 31, 2016
USD ($)
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 ($)
Dec. 31, 2008
USD ($)
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance $ 51,995                  
Duration required for loss data to develop the estimated ultimate incurred claims 36 months                  
Minimum [Member]                    
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Property and casualty claim threshold amount required for review $ 25,000                  
Medicare Supplement Insurance [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 479,469                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. 469,101                  
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 10,368                  
Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 158,363                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. 126,913                  
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 31,450                  
Automobile Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 33,691                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. 32,614                  
All outstanding liabilities prior period net of reinsurance 33                  
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 1,110                  
General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 15,080                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. 11,466                  
All outstanding liabilities prior period net of reinsurance 288                  
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 3,902                  
Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 34,032                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. 30,871                  
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance 3,161                  
Accident Year 2008 [Member] | Medicare Supplement Insurance [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 28,682 $ 28,682 $ 28,683 $ 28,683 $ 28,687 $ 28,688 $ 28,712 $ 28,721 $ 28,698 $ 29,344
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 533,112                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 28,682 28,682 28,683 28,683 28,687 28,688 28,712 28,721 28,698 24,055
Accident Year 2008 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 6,105 6,105 6,104 6,106 6,112 6,124 6,374 6,627 7,011 9,723
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 1,534                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 6,105 6,105 6,104 6,104 6,065 5,839 5,695 5,077 4,202 2,426
Accident Year 2008 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 2,853 2,647 2,548 2,507 2,489 2,479 2,685 2,858 4,359 5,386
IBNR Reserves $ 23                  
Cumulative number of reported claims | Claim 393                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 2,755 2,564 2,506 2,418 2,123 2,023 1,861 1,637 1,091 534
Accident Year 2008 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 2,324 2,324 2,324 2,360 2,360 2,312 2,312 2,420 2,098 3,883
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 62                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 2,324 2,324 2,324 2,360 2,359 2,311 2,232 2,261 1,369 $ 503
Accident Year 2009 [Member] | Medicare Supplement Insurance [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 30,430 30,430 30,431 30,432 30,438 30,447 30,481 30,455 31,124  
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 560,430                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 30,430 30,430 30,431 30,432 30,438 30,447 30,481 30,455 29,866  
Accident Year 2009 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 8,153 8,154 8,155 8,123 8,245 8,558 8,659 8,891 10,817  
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 1,755                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 8,153 8,154 8,155 8,123 7,995 7,502 6,353 5,208 3,250  
Accident Year 2009 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 1,888 1,832 1,828 1,727 1,702 1,730 1,944 2,215 3,392  
IBNR Reserves $ 8                  
Cumulative number of reported claims | Claim 290                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 1,855 1,816 1,796 1,662 1,629 1,410 1,082 941 476  
Accident Year 2009 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 4,667 4,664 4,916 4,636 3,616 3,951 4,239 5,025 4,920  
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 83                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 4,666 4,663 3,757 3,760 3,410 3,205 2,640 1,595 $ 103  
Accident Year 2010 [Member] | Medicare Supplement Insurance [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 34,265 34,268 34,272 34,282 34,303 34,323 34,328 34,849    
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 625,695                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 34,265 34,268 34,272 34,282 34,303 34,323 34,328 29,127    
Accident Year 2010 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 10,201 10,202 10,185 10,068 9,937 10,547 10,818 10,752    
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 1,947                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 10,206 10,090 10,056 9,725 9,382 8,291 6,274 3,211    
Accident Year 2010 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 2,473 2,423 2,400 2,258 2,337 2,269 2,699 4,114    
IBNR Reserves $ 4                  
Cumulative number of reported claims | Claim 289                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 2,457 2,382 2,368 2,037 1,542 1,374 678 284    
Accident Year 2010 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 3,534 3,563 3,549 3,607 3,396 3,618 4,624 3,995    
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 95                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 3,534 3,560 3,545 3,252 2,943 2,780 2,193 $ 928    
Accident Year 2011 [Member] | Medicare Supplement Insurance [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 38,299 38,302 38,316 38,327 38,360 38,296 38,188      
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 664,049                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 38,299 38,302 38,316 38,327 38,360 38,296 31,720      
Accident Year 2011 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 13,385 13,495 13,281 13,289 13,235 13,802 12,263      
IBNR Reserves $ 30                  
Cumulative number of reported claims | Claim 2,132                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 13,199 13,106 13,039 12,071 9,858 7,934 4,205      
Accident Year 2011 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 1,327 1,242 1,174 1,338 1,452 1,723 3,022      
IBNR Reserves $ 11                  
Cumulative number of reported claims | Claim 201                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 1,278 1,169 1,161 835 582 412 295      
Accident Year 2011 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 5,112 5,031 4,966 5,092 5,080 4,786 4,422      
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 126                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 5,109 5,022 4,939 4,748 4,622 3,207 $ 1,031      
Accident Year 2012 [Member] | Medicare Supplement Insurance [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 50,987 50,989 50,998 51,021 50,996 50,021        
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 867,047                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 50,987 50,989 50,998 51,021 50,996 42,267        
Accident Year 2012 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 13,343 13,313 13,707 14,108 15,007 12,980        
IBNR Reserves $ 22                  
Cumulative number of reported claims | Claim 3,340                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 13,211 13,197 12,932 11,507 8,791 4,627        
Accident Year 2012 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 1,333 1,214 1,270 1,269 1,305 4,055        
IBNR Reserves $ 26                  
Cumulative number of reported claims | Claim 157                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 1,219 1,113 1,034 847 707 371        
Accident Year 2012 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 4,880 4,869 5,345 5,396 4,767 4,979        
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 87                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 4,880 4,869 5,331 4,856 4,581 $ 2,257        
Accident Year 2013 [Member] | Medicare Supplement Insurance [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 57,021 57,023 57,034 56,970 56,974          
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 957,350                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 57,021 57,023 57,034 56,970 47,770          
Accident Year 2013 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 21,352 21,823 21,096 20,702 18,664          
IBNR Reserves $ 162                  
Cumulative number of reported claims | Claim 3,260                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 20,382 19,407 16,782 12,193 5,144          
Accident Year 2013 [Member] | Automobile Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 5,599 5,599 5,536 5,515 6,039          
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 1,598                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 5,599 5,599 5,466 5,486 4,778          
Accident Year 2013 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 865 817 926 728 3,461          
IBNR Reserves $ 18                  
Cumulative number of reported claims | Claim 187                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 791 811 579 339 104          
Accident Year 2013 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 2,866 2,947 2,743 2,007 3,060          
IBNR Reserves $ 13                  
Cumulative number of reported claims | Claim 57                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 2,789 2,763 1,369 1,010 $ 323          
Accident Year 2014 [Member] | Medicare Supplement Insurance [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 56,981 56,981 56,938 57,179            
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 939,444                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 56,981 56,981 56,938 48,024            
Accident Year 2014 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 22,353 22,041 21,881 20,812            
IBNR Reserves $ 816                  
Cumulative number of reported claims | Claim 3,536                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 20,177 17,554 13,807 6,822            
Accident Year 2014 [Member] | Automobile Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 7,562 7,583 7,657 8,079            
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 1,635                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 7,562 7,570 7,619 6,437            
Accident Year 2014 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 476 557 501 3,744            
IBNR Reserves $ 40                  
Cumulative number of reported claims | Claim 192                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 369 331 299 171            
Accident Year 2014 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 2,760 2,990 3,130 3,214            
IBNR Reserves $ 4                  
Cumulative number of reported claims | Claim 51                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 2,739 2,727 2,327 $ 1,331            
Accident Year 2015 [Member] | Medicare Supplement Insurance [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 54,993 54,939 55,482              
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 898,270                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 54,993 54,876 45,430              
Accident Year 2015 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 20,017 19,857 18,521              
IBNR Reserves $ 1,904                  
Cumulative number of reported claims | Claim 3,492                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 14,938 11,878 6,226              
Accident Year 2015 [Member] | Automobile Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 7,887 7,955 8,287              
IBNR Reserves $ 0                  
Cumulative number of reported claims | Claim 1,588                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 7,885 7,937 6,745              
Accident Year 2015 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 1,227 1,037 4,421              
IBNR Reserves $ 348                  
Cumulative number of reported claims | Claim 143                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 464 259 98              
Accident Year 2015 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 1,400 1,630 1,902              
IBNR Reserves $ 78                  
Cumulative number of reported claims | Claim 49                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 1,127 856 $ 641              
Accident Year 2016 [Member] | Medicare Supplement Insurance [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 59,851 58,849                
IBNR Reserves $ 100                  
Cumulative number of reported claims | Claim 1,034,900                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 59,747 49,165                
Accident Year 2016 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 21,275 20,549                
IBNR Reserves $ 3,049                  
Cumulative number of reported claims | Claim 3,755                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 13,141 6,796                
Accident Year 2016 [Member] | Automobile Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 6,386 6,877                
IBNR Reserves $ 3                  
Cumulative number of reported claims | Claim 1,261                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 6,353 5,804                
Accident Year 2016 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 1,148 3,119                
IBNR Reserves $ 440                  
Cumulative number of reported claims | Claim 81                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 203 116                
Accident Year 2016 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 1,812 3,314                
IBNR Reserves $ 39                  
Cumulative number of reported claims | Claim 45                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 1,732 $ 1,054                
Accident Year 2017 [Member] | Medicare Supplement Insurance [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 67,960                  
IBNR Reserves $ 9,822                  
Cumulative number of reported claims | Claim 1,303,865                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 57,696                  
Accident Year 2017 [Member] | Automobile Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 22,179                  
IBNR Reserves $ 7,311                  
Cumulative number of reported claims | Claim 3,385                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 7,401                  
Accident Year 2017 [Member] | Automobile Physical Damage [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 6,257                  
IBNR Reserves $ 105                  
Cumulative number of reported claims | Claim 1,238                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 5,215                  
Accident Year 2017 [Member] | General Liability [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 1,490                  
IBNR Reserves $ 1,241                  
Cumulative number of reported claims | Claim 58                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 75                  
Accident Year 2017 [Member] | Surety [Member]                    
Incurred Claims Development, Net of Reinsurance [Abstract]                    
Incurred claims and allocated claim adjustment expenses, net of reinsurance 4,677                  
IBNR Reserves $ 2,043                  
Cumulative number of reported claims | Claim 52                  
Cumulative Paid Claims Development, Net of Reinsurance [Abstract]                    
Cumulative paid claims and allocated claim adjustment expense, net of reinsurance. $ 1,971