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Loss and loss adjustment expense reserves Loss and loss adjustment expense reserves (claims development triangles) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Claims Development [Line Items]                
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 1,099,434              
Multi-line                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 624,836              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 269,068              
Cumulative net losses and loss adjustment expenses paid 338,068              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 286,768              
Multi-line | Accident Year 2012                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0 0
Multi-line | Accident Year 2013                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 4,564 4,564 4,564 4,564 4,564 4,272 9  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 4,563 4,563 4,563 4,563 4,563 1,243 0  
Multi-line | Accident Year 2014                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 37,759 37,547 35,747 40,095 35,651 47,493    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 16,870              
Cumulative net losses and loss adjustment expenses paid 20,822 20,536 18,803 20,782 14,242 1,179    
Multi-line | Accident Year 2015                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 116,499 107,292 106,957 108,581 86,003      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 37,445              
Cumulative net losses and loss adjustment expenses paid 78,443 76,564 73,844 65,309 30,620      
Multi-line | Accident Year 2016                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 124,262 116,702 120,774 119,902        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 35,944              
Cumulative net losses and loss adjustment expenses paid 87,192 84,047 76,034 30,640        
Multi-line | Accident Year 2017                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 110,994 107,485 100,304          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 30,137              
Cumulative net losses and loss adjustment expenses paid 79,660 74,191 53,789          
Multi-line | Accident Year 2018                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 101,510 90,463            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 43,334              
Cumulative net losses and loss adjustment expenses paid 48,060 30,497            
Multi-line | Short-duration Insurance Contracts, Accident Year 2019 [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 129,248              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 105,338              
Cumulative net losses and loss adjustment expenses paid 19,328              
Credit & Financial Lines                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 47,464              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 26,552              
Cumulative net losses and loss adjustment expenses paid 15,768              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 31,696              
Credit & Financial Lines | Accident Year 2012                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0 0
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0 0
Credit & Financial Lines | Accident Year 2013                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 80 77 99 107 113 408 364  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 2              
Cumulative net losses and loss adjustment expenses paid 77 77 78 74 66 11 0  
Credit & Financial Lines | Accident Year 2014                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 1,454 1,384 2,203 2,416 2,643 5,774    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 95              
Cumulative net losses and loss adjustment expenses paid 1,344 1,322 1,318 1,038 784 42    
Credit & Financial Lines | Accident Year 2015                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 3,127 4,007 4,752 5,032 5,234      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 517              
Cumulative net losses and loss adjustment expenses paid 2,503 2,328 2,045 1,128 402      
Credit & Financial Lines | Accident Year 2016                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 6,560 10,816 10,721 10,726        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 1,751              
Cumulative net losses and loss adjustment expenses paid 4,196 3,419 2,326 1,013        
Credit & Financial Lines | Accident Year 2017                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 7,313 13,773 13,740          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 3,364              
Cumulative net losses and loss adjustment expenses paid 3,031 2,332 1,100          
Credit & Financial Lines | Accident Year 2018                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 10,940 17,715            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 6,482              
Cumulative net losses and loss adjustment expenses paid 2,717 897            
Credit & Financial Lines | Short-duration Insurance Contracts, Accident Year 2019 [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 17,990              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 14,341              
Cumulative net losses and loss adjustment expenses paid 1,900              
Other Casualty                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 397,761              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 270,429              
Cumulative net losses and loss adjustment expenses paid 71,410              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 326,351              
Other Casualty | Accident Year 2012                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0 0
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0 0
Other Casualty | Accident Year 2013                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0  
Other Casualty | Accident Year 2014                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 5,849 5,584 4,903 7,316 7,519 5,480    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 1,302              
Cumulative net losses and loss adjustment expenses paid 3,685 3,104 2,226 1,390 340 16    
Other Casualty | Accident Year 2015                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 38,970 37,113 33,396 48,315 45,558      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 10,435              
Cumulative net losses and loss adjustment expenses paid 20,550 15,781 9,053 3,612 310      
Other Casualty | Accident Year 2016                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 56,774 54,990 52,118 63,082        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 23,647              
Cumulative net losses and loss adjustment expenses paid 20,783 13,467 6,165 621        
Other Casualty | Accident Year 2017                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 75,334 71,091 70,158          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 48,072              
Cumulative net losses and loss adjustment expenses paid 12,798 6,231 1,418          
Other Casualty | Accident Year 2018                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 124,859 120,553            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 99,737              
Cumulative net losses and loss adjustment expenses paid 9,968 1,674            
Other Casualty | Short-duration Insurance Contracts, Accident Year 2019 [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 95,975              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 87,236              
Cumulative net losses and loss adjustment expenses paid 3,626              
Non-Standard Auto Contract [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 433,001              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 14,526              
Cumulative net losses and loss adjustment expenses paid 406,534              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 26,467              
Non-Standard Auto Contract [Member] | Accident Year 2012                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 11,349 11,356 11,333 11,433 11,534 11,777 12,264 13,247
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 11,349 11,348 11,318 11,382 11,450 11,387 9,989 5,619
Non-Standard Auto Contract [Member] | Accident Year 2013                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 19,489 19,534 19,483 19,338 19,472 19,990 20,830  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 7              
Cumulative net losses and loss adjustment expenses paid 19,479 19,463 19,363 19,066 18,686 17,244 8,673  
Non-Standard Auto Contract [Member] | Accident Year 2014                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 103,623 103,822 103,661 103,568 103,473 104,896    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 53              
Cumulative net losses and loss adjustment expenses paid 103,515 103,379 102,868 101,626 97,651 45,766    
Non-Standard Auto Contract [Member] | Accident Year 2015                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 89,241 89,459 89,550 88,705 82,677      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 119              
Cumulative net losses and loss adjustment expenses paid 88,630 88,168 86,100 80,765 42,451      
Non-Standard Auto Contract [Member] | Accident Year 2016                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 86,511 86,434 85,903 77,785        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 343              
Cumulative net losses and loss adjustment expenses paid 85,027 82,556 77,511 38,059        
Non-Standard Auto Contract [Member] | Accident Year 2017                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 50,698 50,793 48,682          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 809              
Cumulative net losses and loss adjustment expenses paid 48,665 45,196 23,546          
Non-Standard Auto Contract [Member] | Accident Year 2018                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 43,039 45,145            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 1,602              
Cumulative net losses and loss adjustment expenses paid 38,918 21,182            
Non-Standard Auto Contract [Member] | Short-duration Insurance Contracts, Accident Year 2019 [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 29,051              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 11,593              
Cumulative net losses and loss adjustment expenses paid 10,951              
Workers’ Compensation                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 228,349              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 47,466              
Cumulative net losses and loss adjustment expenses paid 145,318              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 83,031              
Workers’ Compensation | Accident Year 2012                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 5,938 5,874 5,720 5,715 5,596 5,066 4,534 4,037
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 6              
Cumulative net losses and loss adjustment expenses paid 5,347 5,110 4,796 4,969 4,280 3,017 624 93
Workers’ Compensation | Accident Year 2013                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 32,741 33,067 33,252 33,449 33,365 28,616 27,449  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 286              
Cumulative net losses and loss adjustment expenses paid 30,377 29,082 26,956 22,826 16,840 9,142 2,587  
Workers’ Compensation | Accident Year 2014                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 41,115 42,037 43,470 47,200 46,568 40,247    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 1,699              
Cumulative net losses and loss adjustment expenses paid 36,262 34,112 29,573 24,280 15,947 4,073    
Workers’ Compensation | Accident Year 2015                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 31,116 32,529 34,800 37,138 35,749      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 2,723              
Cumulative net losses and loss adjustment expenses paid 24,942 22,432 17,001 10,755 2,669      
Workers’ Compensation | Accident Year 2016                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 31,047 36,475 39,205 40,433        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 4,159              
Cumulative net losses and loss adjustment expenses paid 21,754 18,346 13,236 3,985        
Workers’ Compensation | Accident Year 2017                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 34,453 40,459 41,075          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 9,205              
Cumulative net losses and loss adjustment expenses paid 16,908 11,868 4,586          
Workers’ Compensation | Accident Year 2018                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 25,050 27,753            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 10,630              
Cumulative net losses and loss adjustment expenses paid 7,089 2,552            
Workers’ Compensation | Short-duration Insurance Contracts, Accident Year 2019 [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 26,889              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 18,758              
Cumulative net losses and loss adjustment expenses paid 2,639              
Other Property                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 329,464              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 48,863              
Cumulative net losses and loss adjustment expenses paid 269,327              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 60,137              
Other Property | Accident Year 2012                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 9,490 9,501 9,472 9,416 9,353 9,375 8,672 10,917
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 9,483 9,482 9,400 9,352 9,186 9,075 8,381 4,656
Other Property | Accident Year 2013                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 26,051 26,170 25,785 25,882 25,766 24,980 27,765  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 7              
Cumulative net losses and loss adjustment expenses paid 25,993 25,815 25,406 25,167 24,023 22,229 14,635  
Other Property | Accident Year 2014                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 46,303 46,500 44,627 41,336 40,920 40,256    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 725              
Cumulative net losses and loss adjustment expenses paid 45,312 44,533 42,775 38,448 34,381 19,420    
Other Property | Accident Year 2015                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 56,201 56,313 54,635 52,533 50,330      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 1,533              
Cumulative net losses and loss adjustment expenses paid 53,924 51,783 48,360 43,382 22,706      
Other Property | Accident Year 2016                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 43,733 43,799 43,038 45,415        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 2,906              
Cumulative net losses and loss adjustment expenses paid 39,651 37,044 31,871 21,593        
Other Property | Accident Year 2017                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 41,753 41,833 41,237          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 3,120              
Cumulative net losses and loss adjustment expenses paid 37,171 33,436 24,713          
Other Property | Accident Year 2018                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 52,343 54,084            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 14,267              
Cumulative net losses and loss adjustment expenses paid 35,169 26,458            
Other Property | Short-duration Insurance Contracts, Accident Year 2019 [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 53,590              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 26,305              
Cumulative net losses and loss adjustment expenses paid 22,624              
Other Property                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 39,251              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 38,529              
Cumulative net losses and loss adjustment expenses paid 470              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 38,781              
Other Property | Accident Year 2012                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0 0
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0 0
Other Property | Accident Year 2013                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0  
Other Property | Accident Year 2014                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0    
Other Property | Accident Year 2015                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0      
Other Property | Accident Year 2016                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0        
Other Property | Accident Year 2017                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0          
Other Property | Accident Year 2018                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0            
Other Property | Short-duration Insurance Contracts, Accident Year 2019 [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 39,251              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 38,529              
Cumulative net losses and loss adjustment expenses paid 470              
Other Specialty                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 93,898              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 11,069              
Cumulative net losses and loss adjustment expenses paid 77,554              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 16,344              
Other Specialty | Accident Year 2012                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 50,104 50,104 50,104 50,065 50,055 50,055 49,942 52,105
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 50,103 50,103 50,103 50,067 50,025 50,024 48,455 $ 2,666
Other Specialty | Accident Year 2013                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 23,125 23,138 23,135 23,138 23,450 24,274 25,582  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 23,127 23,137 23,135 23,134 23,138 22,232 0  
Other Specialty | Accident Year 2014                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0    
Other Specialty | Accident Year 2015                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0      
Other Specialty | Accident Year 2016                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 730 812 0 0        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 691              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0        
Other Specialty | Accident Year 2017                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 4,025 3,544 4,033          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 447              
Cumulative net losses and loss adjustment expenses paid 575 261 4          
Other Specialty | Accident Year 2018                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 6,866 6,213            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 2,573              
Cumulative net losses and loss adjustment expenses paid 2,109 957            
Other Specialty | Short-duration Insurance Contracts, Accident Year 2019 [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 9,048              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 7,358              
Cumulative net losses and loss adjustment expenses paid 1,640              
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 67,151              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 1,835              
Cumulative net losses and loss adjustment expenses paid 65,316              
Short Duration Insurance Contracts, Liability For Unpaid Claims And Allocated Claims Adjustment Expense, Net, Separately Presented 1,835              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 208              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 2,043              
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2010                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 147 221            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 140              
Cumulative net losses and loss adjustment expenses paid 7 0            
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2011                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 131 200            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 128              
Cumulative net losses and loss adjustment expenses paid 3 0            
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2012                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 367 442            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 103              
Cumulative net losses and loss adjustment expenses paid 264 0            
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2013                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 2,007 2,230            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 148              
Cumulative net losses and loss adjustment expenses paid 1,859 0            
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2014                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 5,288 5,809            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 241              
Cumulative net losses and loss adjustment expenses paid 5,047 0            
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2015                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 11,692 12,754            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 331              
Cumulative net losses and loss adjustment expenses paid 11,361 0            
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2016                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 17,871 19,431            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 364              
Cumulative net losses and loss adjustment expenses paid 17,507 0            
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2017                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 15,889 17,257            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 279              
Cumulative net losses and loss adjustment expenses paid 15,610 0            
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2018                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 13,759 14,880            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 101              
Cumulative net losses and loss adjustment expenses paid 13,658 0            
Contracts incepting in 2018 [Member] | Retroactive Reinsurance Contract [Member] | Short-duration Insurance Contracts, Accident Year 2019 [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0            
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 61,952              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 61,952              
Cumulative net losses and loss adjustment expenses paid 0              
Short Duration Insurance Contracts, Liability For Unpaid Claims And Allocated Claims Adjustment Expense, Net, Separately Presented 61,952              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 256              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 62,208              
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] | Accident Year 2010                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 237 371 442          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 237              
Cumulative net losses and loss adjustment expenses paid 0 0 0          
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] | Accident Year 2011                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 966 1,567 1,648          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 966              
Cumulative net losses and loss adjustment expenses paid 0 0 0          
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] | Accident Year 2012                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 1,295 2,110 2,185          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 1,295              
Cumulative net losses and loss adjustment expenses paid 0 0 0          
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] | Accident Year 2013                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 2,000 3,264 3,358          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 2,000              
Cumulative net losses and loss adjustment expenses paid 0 0 0          
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] | Accident Year 2014                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 5,768 9,453 9,582          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 5,768              
Cumulative net losses and loss adjustment expenses paid 0 0 0          
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] | Accident Year 2015                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 7,570 12,398 12,597          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 7,570              
Cumulative net losses and loss adjustment expenses paid 0 0 0          
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] | Accident Year 2016                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 14,397 23,617 23,854          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 14,397              
Cumulative net losses and loss adjustment expenses paid 0 0 0          
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] | Accident Year 2017                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 29,719 48,888 48,877          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 29,719              
Cumulative net losses and loss adjustment expenses paid 0 0 0          
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] | Accident Year 2018                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0          
Contracts incepting in 2017 | Retroactive Reinsurance Contract [Member] | Short-duration Insurance Contracts, Accident Year 2019 [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0          
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 41,849              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 41,849              
Cumulative net losses and loss adjustment expenses paid 0              
Short Duration Insurance Contracts, Liability For Unpaid Claims And Allocated Claims Adjustment Expense, Net, Separately Presented 41,849              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 1,757              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 43,606              
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] | Accident Year 2010                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 2,225 3,561 3,932 5,324 5,324      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 2,225              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0      
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] | Accident Year 2011                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 4,509 7,318 7,703 10,165 10,165      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 4,509              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0      
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] | Accident Year 2012                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 6,817 11,132 11,470 14,952 14,952      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 6,817              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0      
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] | Accident Year 2013                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 8,432 13,779 14,162 18,435 18,435      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 8,432              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0      
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] | Accident Year 2014                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 18,953 31,098 31,500 40,654 40,654      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 18,953              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0      
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] | Accident Year 2015                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 913 1,395 1,788 2,596 2,596      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 913              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0      
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] | Accident Year 2016                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0      
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] | Accident Year 2017                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0      
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] | Accident Year 2018                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0      
Contracts incepting in 2015 | Retroactive Reinsurance Contract [Member] | Short-duration Insurance Contracts, Accident Year 2019 [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0      
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 18,045              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 18,045              
Cumulative net losses and loss adjustment expenses paid 0              
Short Duration Insurance Contracts, Liability For Unpaid Claims And Allocated Claims Adjustment Expense, Net, Separately Presented 18,045              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 0              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 18,045              
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] | Accident Year 2010                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 444    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0    
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] | Accident Year 2011                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 1,529 2,884 3,252 3,057 3,455 4,239    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 1,529              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0    
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] | Accident Year 2012                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 4,778 9,011 10,162 9,553 10,794 12,173    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 4,778              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0    
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] | Accident Year 2013                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 7,493 14,132 15,938 14,982 16,929 18,907    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 7,493              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0    
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] | Accident Year 2014                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 4,245 8,005 9,028 8,487 9,590 10,700    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 4,245              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0    
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] | Accident Year 2015                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0    
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] | Accident Year 2016                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0    
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] | Accident Year 2017                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0    
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] | Accident Year 2018                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0    
Contracts incepting in 2014 | Retroactive Reinsurance Contract [Member] | Short-duration Insurance Contracts, Accident Year 2019 [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0    
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 16,509              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 16,509              
Short Duration Insurance Contracts, Liability For Unpaid Claims And Allocated Claims Adjustment Expense, Net, Separately Presented 0              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 9,524              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 9,524              
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] | Accident Year 2010                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 704 704 704 704 704 704 914  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 704 704 704 704 704 279 0  
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] | Accident Year 2011                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 4,173 4,173 4,173 4,173 4,173 4,173 5,419  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 4,173 4,173 4,173 4,173 4,173 1,654 0  
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] | Accident Year 2012                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 7,853 7,853 7,853 7,853 7,853 7,853 10,197  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 7,853 7,853 7,853 7,853 7,853 3,113 0  
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] | Accident Year 2013                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 3,779 3,779 3,779 3,779 3,779 3,779 4,908  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 3,779 3,779 3,779 3,779 3,779 1,498 0  
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] | Accident Year 2014                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0  
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] | Accident Year 2015                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0  
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] | Accident Year 2016                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0  
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] | Accident Year 2017                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0  
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] | Accident Year 2018                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0  
Contracts incepting in 2013 | Retroactive Reinsurance Contract [Member] | Short-duration Insurance Contracts, Accident Year 2019 [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 0              
Cumulative net losses and loss adjustment expenses paid 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0  
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 92,790              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 92,790              
Cumulative net losses and loss adjustment expenses paid 0              
Short Duration Insurance Contracts, Liability For Unpaid Claims And Allocated Claims Adjustment Expense, Net, Separately Presented 92,790              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 1,643              
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 94,433              
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2010                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 945              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 945              
Cumulative net losses and loss adjustment expenses paid 0              
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2011                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 2,064              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 2,064              
Cumulative net losses and loss adjustment expenses paid 0              
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2012                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 1,211              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 1,211              
Cumulative net losses and loss adjustment expenses paid 0              
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2013                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 1,983              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 1,983              
Cumulative net losses and loss adjustment expenses paid 0              
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2014                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 4,328              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 4,328              
Cumulative net losses and loss adjustment expenses paid 0              
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2015                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 6,197              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 6,197              
Cumulative net losses and loss adjustment expenses paid 0              
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2016                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 10,858              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 10,858              
Cumulative net losses and loss adjustment expenses paid 0              
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2017                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 12,908              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 12,908              
Cumulative net losses and loss adjustment expenses paid 0              
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] | Accident Year 2018                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 16,769              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 16,769              
Cumulative net losses and loss adjustment expenses paid 0              
Contracts incepting in 2019 [Member] | Retroactive Reinsurance Contract [Member] | Short-duration Insurance Contracts, Accident Year 2019 [Member]                
Claims Development [Line Items]                
Loss and loss adjustment expenses incurred, net 35,527              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net 35,527              
Cumulative net losses and loss adjustment expenses paid $ 0