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Loss and loss adjustment expense reserves - Claims development triangles (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Loss and Loss Adjustment Expense Reserves [Abstract]                  
Number of operating segments | segment 4                
Claims Development [Line Items]                  
Net reserves for loss and loss adjustment expenses $ 1,289,699                
Global A&H                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 10,586                
IBNR loss and LAE reserves, net 3,681                
Cumulative net losses and loss adjustment expenses paid 6,905                
Net reserves for loss and loss adjustment expenses 3,681                
Global A&H | Accident Year 2012                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0 0 0
Global A&H | Accident Year 2013                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0 0  
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0 0  
Global A&H | Accident Year 2014                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0    
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0    
Global A&H | Accident Year 2015                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0      
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0      
Global A&H | Accident Year 2016                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0        
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0        
Global A&H | Accident Year 2017                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 829 813 716 716          
IBNR loss and LAE reserves, net 2                
Cumulative net losses and loss adjustment expenses paid 827 575 261 4          
Global A&H | Accident Year 2018                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 3,039 2,982 2,624            
IBNR loss and LAE reserves, net 7                
Cumulative net losses and loss adjustment expenses paid 3,032 2,109 957            
Global A&H | Accident Year 2019                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 3,565 3,437              
IBNR loss and LAE reserves, net 1,001                
Cumulative net losses and loss adjustment expenses paid 2,564 1,640              
Global A&H | Accident Year 2020                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 3,153                
IBNR loss and LAE reserves, net 2,671                
Cumulative net losses and loss adjustment expenses paid 482                
Marine & Energy                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 14,377                
IBNR loss and LAE reserves, net 7,448                
Cumulative net losses and loss adjustment expenses paid 2,282                
Net reserves for loss and loss adjustment expenses 12,095                
Marine & Energy | Accident Year 2012                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0 0 0
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0 0 0
Marine & Energy | Accident Year 2013                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0 0  
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0 0  
Marine & Energy | Accident Year 2014                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0    
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0    
Marine & Energy | Accident Year 2015                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0      
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0      
Marine & Energy | Accident Year 2016                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 119 730 812 3,885 4,673        
IBNR loss and LAE reserves, net 80                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0        
Marine & Energy | Accident Year 2017                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 3,478 3,212 2,829 3,932          
IBNR loss and LAE reserves, net 525                
Cumulative net losses and loss adjustment expenses paid 126 0 0 0          
Marine & Energy | Accident Year 2018                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 3,088 3,852 3,589            
IBNR loss and LAE reserves, net 585                
Cumulative net losses and loss adjustment expenses paid 2,003 0 0            
Marine & Energy | Accident Year 2019                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 4,250 3,967              
IBNR loss and LAE reserves, net 2,839                
Cumulative net losses and loss adjustment expenses paid 153 0              
Marine & Energy | Accident Year 2020                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 3,442                
IBNR loss and LAE reserves, net 3,419                
Cumulative net losses and loss adjustment expenses paid 0                
Credit                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 72,466                
IBNR loss and LAE reserves, net 28,537                
Cumulative net losses and loss adjustment expenses paid 26,913                
Net reserves for loss and loss adjustment expenses 45,553                
Credit | Accident Year 2012                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0 0 0
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0 0 0
Credit | Accident Year 2013                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 77 80 77 99 107 113 408 364  
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 76 77 77 78 74 66 11 0  
Credit | Accident Year 2014                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 1,341 1,454 1,384 2,204 2,430 2,657 5,844    
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 1,310 1,344 1,322 1,318 1,038 784 42    
Credit | Accident Year 2015                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 2,665 3,129 4,012 4,760 5,048 5,249      
IBNR loss and LAE reserves, net 78                
Cumulative net losses and loss adjustment expenses paid 2,408 2,503 2,328 2,045 1,128 402      
Credit | Accident Year 2016                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 6,752 6,564 10,825 10,732 10,750        
IBNR loss and LAE reserves, net 1,247                
Cumulative net losses and loss adjustment expenses paid 4,213 4,197 3,419 2,326 1,013        
Credit | Accident Year 2017                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 7,445 7,029 13,460 13,356          
IBNR loss and LAE reserves, net 2,511                
Cumulative net losses and loss adjustment expenses paid 3,319 3,026 2,332 1,100          
Credit | Accident Year 2018                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 12,035 10,661 17,415            
IBNR loss and LAE reserves, net 4,947                
Cumulative net losses and loss adjustment expenses paid 3,989 2,716 897            
Credit | Accident Year 2019                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 19,348 17,740              
IBNR loss and LAE reserves, net 10,352                
Cumulative net losses and loss adjustment expenses paid 3,368 1,900              
Credit | Accident Year 2020                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 22,803                
IBNR loss and LAE reserves, net 9,402                
Cumulative net losses and loss adjustment expenses paid 8,230                
Casualty                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 1,336,014                
IBNR loss and LAE reserves, net 452,860                
Cumulative net losses and loss adjustment expenses paid 720,001                
Net reserves for loss and loss adjustment expenses 616,013                
Casualty | Accident Year 2012                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 17,377 17,287 17,230 17,053 17,148 17,130 16,842 16,798 17,284
IBNR loss and LAE reserves, net 7                
Cumulative net losses and loss adjustment expenses paid 17,038 16,695 16,458 16,114 16,351 15,730 14,404 10,613 5,713
Casualty | Accident Year 2013                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 52,450 52,230 52,601 52,735 52,787 52,837 48,606 48,279  
IBNR loss and LAE reserves, net 486                
Cumulative net losses and loss adjustment expenses paid 50,281 49,855 48,545 46,319 41,892 35,526 26,386 11,260  
Casualty | Accident Year 2014                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 170,052 167,237 168,102 168,861 174,714 174,182 167,001    
IBNR loss and LAE reserves, net 11,237                
Cumulative net losses and loss adjustment expenses paid 145,293 143,441 140,576 134,658 127,284 113,933 49,855    
Casualty | Accident Year 2015                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 195,369 195,821 186,499 183,964 199,697 189,321      
IBNR loss and LAE reserves, net 23,674                
Cumulative net losses and loss adjustment expenses paid 141,579 134,143 126,400 112,164 95,143 45,434      
Casualty | Accident Year 2016                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 215,964 208,768 205,252 202,618 206,074        
IBNR loss and LAE reserves, net 48,630                
Cumulative net losses and loss adjustment expenses paid 137,822 127,468 114,312 96,910 42,665        
Casualty | Accident Year 2017                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 197,100 186,623 186,073 181,109          
IBNR loss and LAE reserves, net 73,252                
Cumulative net losses and loss adjustment expenses paid 97,029 78,105 63,183 29,550          
Casualty | Accident Year 2018                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 203,571 195,043 196,161            
IBNR loss and LAE reserves, net 99,702                
Cumulative net losses and loss adjustment expenses paid 78,508 55,558 25,181            
Casualty | Accident Year 2019                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 160,409 148,962              
IBNR loss and LAE reserves, net 94,732                
Cumulative net losses and loss adjustment expenses paid 42,471 16,826              
Casualty | Accident Year 2020                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 123,722                
IBNR loss and LAE reserves, net 101,140                
Cumulative net losses and loss adjustment expenses paid 9,980                
Other Specialty                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 671,595                
IBNR loss and LAE reserves, net 219,040                
Cumulative net losses and loss adjustment expenses paid 408,177                
Net reserves for loss and loss adjustment expenses 263,418                
Other Specialty | Accident Year 2012                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0 0 0
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0 0 0
Other Specialty | Accident Year 2013                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 4,564 4,564 4,564 4,564 4,564 4,564 4,272 2,317  
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 4,563 4,563 4,563 4,563 4,563 4,563 1,243 0  
Other Specialty | Accident Year 2014                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 21,355 21,355 21,346 19,570 24,214 20,272 27,671    
IBNR loss and LAE reserves, net 174                
Cumulative net losses and loss adjustment expenses paid 21,139 21,082 20,792 19,034 20,921 14,304 1,221    
Other Specialty | Accident Year 2015                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 81,312 81,320 81,186 81,934 84,198 61,160      
IBNR loss and LAE reserves, net 525                
Cumulative net losses and loss adjustment expenses paid 80,301 79,727 77,815 74,904 66,086 30,999      
Other Specialty | Accident Year 2016                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 91,409 91,332 90,648 92,759 91,574        
IBNR loss and LAE reserves, net 259                
Cumulative net losses and loss adjustment expenses paid 90,256 88,842 85,422 77,062 30,997        
Other Specialty | Accident Year 2017                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 86,900 86,544 85,255 80,058          
IBNR loss and LAE reserves, net 1,754                
Cumulative net losses and loss adjustment expenses paid 84,079 81,290 75,379 54,370          
Other Specialty | Accident Year 2018                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 97,627 100,329 88,621            
IBNR loss and LAE reserves, net 28,803                
Cumulative net losses and loss adjustment expenses paid 55,655 48,967 31,096            
Other Specialty | Accident Year 2019                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 152,307 134,382              
IBNR loss and LAE reserves, net 86,385                
Cumulative net losses and loss adjustment expenses paid 49,036 19,930              
Other Specialty | Accident Year 2020                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 136,121                
IBNR loss and LAE reserves, net 101,140                
Cumulative net losses and loss adjustment expenses paid 23,148                
Property Catastrophe Excess Reinsurance                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 98,495                
IBNR loss and LAE reserves, net 55,628                
Cumulative net losses and loss adjustment expenses paid 22,647                
Net reserves for loss and loss adjustment expenses 75,848                
Property Catastrophe Excess Reinsurance | Accident Year 2012                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0 0 0
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0 0 0
Property Catastrophe Excess Reinsurance | Accident Year 2013                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0 0  
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0 0  
Property Catastrophe Excess Reinsurance | Accident Year 2014                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0    
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0    
Property Catastrophe Excess Reinsurance | Accident Year 2015                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0      
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0      
Property Catastrophe Excess Reinsurance | Accident Year 2016                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0        
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0        
Property Catastrophe Excess Reinsurance | Accident Year 2017                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0          
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0          
Property Catastrophe Excess Reinsurance | Accident Year 2018                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0            
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0            
Property Catastrophe Excess Reinsurance | Accident Year 2019                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 39,250 39,582              
IBNR loss and LAE reserves, net 11,000                
Cumulative net losses and loss adjustment expenses paid 15,326 470              
Property Catastrophe Excess Reinsurance | Accident Year 2020                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 59,245                
IBNR loss and LAE reserves, net 44,628                
Cumulative net losses and loss adjustment expenses paid 7,321                
Property Risk and Pro Rata                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 390,422                
IBNR loss and LAE reserves, net 46,488                
Cumulative net losses and loss adjustment expenses paid 330,908                
Net reserves for loss and loss adjustment expenses 59,514                
Property Risk and Pro Rata | Accident Year 2012                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 9,484 9,490 9,501 9,472 9,416 9,353 9,375 8,672 10,917
IBNR loss and LAE reserves, net 2                
Cumulative net losses and loss adjustment expenses paid 9,482 9,483 9,482 9,400 9,352 9,186 9,075 8,381 4,656
Property Risk and Pro Rata | Accident Year 2013                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 26,378 26,051 26,170 25,785 25,882 25,766 24,980 27,765  
IBNR loss and LAE reserves, net 232                
Cumulative net losses and loss adjustment expenses paid 26,127 25,993 25,815 25,406 25,167 24,023 22,229 14,635  
Property Risk and Pro Rata | Accident Year 2014                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 46,719 46,303 46,500 44,627 41,336 40,920 40,256    
IBNR loss and LAE reserves, net 576                
Cumulative net losses and loss adjustment expenses paid 45,937 45,312 44,533 42,775 38,448 34,381 19,420    
Property Risk and Pro Rata | Accident Year 2015                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 56,583 56,201 56,313 54,635 52,533 50,330      
IBNR loss and LAE reserves, net 902                
Cumulative net losses and loss adjustment expenses paid 55,066 53,924 51,783 48,360 43,382 22,706      
Property Risk and Pro Rata | Accident Year 2016                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 43,810 43,733 43,799 43,038 45,415        
IBNR loss and LAE reserves, net 1,108                
Cumulative net losses and loss adjustment expenses paid 41,872 39,651 37,044 31,871 21,593        
Property Risk and Pro Rata | Accident Year 2017                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 41,926 41,753 41,833 41,237          
IBNR loss and LAE reserves, net 1,576                
Cumulative net losses and loss adjustment expenses paid 39,282 37,171 33,436 24,713          
Property Risk and Pro Rata | Accident Year 2018                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 52,650 52,344 54,084            
IBNR loss and LAE reserves, net 5,797                
Cumulative net losses and loss adjustment expenses paid 45,146 35,169 26,458            
Property Risk and Pro Rata | Accident Year 2019                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 53,713 53,597              
IBNR loss and LAE reserves, net 7,096                
Cumulative net losses and loss adjustment expenses paid 43,542 22,624              
Property Risk and Pro Rata | Accident Year 2020                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 59,159                
IBNR loss and LAE reserves, net 29,199                
Cumulative net losses and loss adjustment expenses paid 24,454                
Agriculture                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 73,232                
IBNR loss and LAE reserves, net 2                
Cumulative net losses and loss adjustment expenses paid 73,230                
Net reserves for loss and loss adjustment expenses 2                
Agriculture | Accident Year 2012                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 50,104 50,104 50,104 50,104 50,065 50,055 50,055 49,942 52,105
IBNR loss and LAE reserves, net 1                
Cumulative net losses and loss adjustment expenses paid 50,103 50,103 50,103 50,103 50,067 50,025 50,024 48,455 2,666
Agriculture | Accident Year 2013                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 23,128 23,125 23,138 23,135 23,138 23,450 24,274 23,273  
IBNR loss and LAE reserves, net 1                
Cumulative net losses and loss adjustment expenses paid 23,127 23,127 23,137 23,135 23,134 23,138 22,232 0  
Agriculture | Accident Year 2014                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0    
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0    
Agriculture | Accident Year 2015                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0      
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0      
Agriculture | Accident Year 2016                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0        
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0        
Agriculture | Accident Year 2017                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0          
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0          
Agriculture | Accident Year 2018                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0            
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0            
Agriculture | Accident Year 2019                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0              
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0              
Agriculture | Accident Year 2020                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0                
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0                
Other                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 2,863                
IBNR loss and LAE reserves, net 2,863                
Cumulative net losses and loss adjustment expenses paid 0                
Net reserves for loss and loss adjustment expenses 2,863                
Other | Accident Year 2012                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0 0 0
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0 0 $ 0
Other | Accident Year 2013                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0 0  
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0 0  
Other | Accident Year 2014                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0    
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0    
Other | Accident Year 2015                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0      
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0      
Other | Accident Year 2016                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0        
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0        
Other | Accident Year 2017                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0          
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0          
Other | Accident Year 2018                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0            
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0            
Other | Accident Year 2019                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0              
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0              
Other | Accident Year 2020                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 2,863                
IBNR loss and LAE reserves, net 2,863                
Cumulative net losses and loss adjustment expenses paid 0                
Retroactive reinsurance contracts | Contracts incepting in 2018                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 69,305                
IBNR loss and LAE reserves, net 1,695                
Cumulative net losses and loss adjustment expenses paid 67,610                
Net reserves for loss and loss adjustment expenses from 2011 to 2020 1,695                
Net reserves for loss and loss adjustment expenses prior to 2011 348                
Net reserves for loss and loss adjustment expenses 2,043                
Retroactive reinsurance contracts | Contracts incepting in 2017                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 54,414                
IBNR loss and LAE reserves, net 54,414                
Cumulative net losses and loss adjustment expenses paid 0                
Net reserves for loss and loss adjustment expenses from 2011 to 2020 54,414                
Net reserves for loss and loss adjustment expenses prior to 2011 485                
Net reserves for loss and loss adjustment expenses 54,899                
Retroactive reinsurance contracts | Contracts incepting in 2015                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 25,982                
IBNR loss and LAE reserves, net 25,982                
Cumulative net losses and loss adjustment expenses paid 0                
Net reserves for loss and loss adjustment expenses from 2011 to 2020 25,982                
Net reserves for loss and loss adjustment expenses prior to 2011 3,454                
Net reserves for loss and loss adjustment expenses 29,436                
Retroactive reinsurance contracts | Contracts incepting in 2014                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 18,045                
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 18,045                
Net reserves for loss and loss adjustment expenses from 2011 to 2020 0                
Net reserves for loss and loss adjustment expenses prior to 2011 0                
Net reserves for loss and loss adjustment expenses 0                
Retroactive reinsurance contracts | Contracts incepting in 2013                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 15,805                
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 15,805                
Net reserves for loss and loss adjustment expenses from 2011 to 2020 0                
Net reserves for loss and loss adjustment expenses prior to 2011 0                
Net reserves for loss and loss adjustment expenses 0                
Retroactive reinsurance contracts | Contracts incepting in 2019                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 102,093                
IBNR loss and LAE reserves, net 102,093                
Cumulative net losses and loss adjustment expenses paid 0                
Net reserves for loss and loss adjustment expenses from 2011 to 2020 102,093                
Net reserves for loss and loss adjustment expenses prior to 2011 2,553                
Net reserves for loss and loss adjustment expenses 104,646                
Retroactive reinsurance contracts | Contracts incepting in 2020                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 19,678                
IBNR loss and LAE reserves, net 19,680                
Cumulative net losses and loss adjustment expenses paid 0                
Net reserves for loss and loss adjustment expenses from 2011 to 2020 19,678                
Net reserves for loss and loss adjustment expenses prior to 2011 10                
Net reserves for loss and loss adjustment expenses 19,688                
Retroactive reinsurance contracts | Accident Year 2011 | Contracts incepting in 2018                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 132 132 200            
IBNR loss and LAE reserves, net 129                
Cumulative net losses and loss adjustment expenses paid 3 3 0            
Retroactive reinsurance contracts | Accident Year 2011 | Contracts incepting in 2017                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 871 966 1,612 1,693          
IBNR loss and LAE reserves, net 871                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0          
Retroactive reinsurance contracts | Accident Year 2011 | Contracts incepting in 2015                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 3,108 4,509 7,527 7,913 10,433 10,433      
IBNR loss and LAE reserves, net 3,108                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0      
Retroactive reinsurance contracts | Accident Year 2011 | Contracts incepting in 2014                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 1,529 1,529 2,895 3,274 3,090 3,498 4,293    
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 1,529 0 0 0 0 0 0    
Retroactive reinsurance contracts | Accident Year 2011 | Contracts incepting in 2013                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 4,173 4,173 4,173 4,173 4,173 4,173 4,173 5,419  
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 4,173 4,173 4,173 4,173 4,173 4,173 1,654 0  
Retroactive reinsurance contracts | Accident Year 2011 | Contracts incepting in 2019                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 2,218 2,064              
IBNR loss and LAE reserves, net 2,218                
Cumulative net losses and loss adjustment expenses paid 0 0              
Retroactive reinsurance contracts | Accident Year 2011 | Contracts incepting in 2020                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 184                
IBNR loss and LAE reserves, net 184                
Cumulative net losses and loss adjustment expenses paid 0                
Retroactive reinsurance contracts | Accident Year 2012 | Contracts incepting in 2018                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 376 376 452            
IBNR loss and LAE reserves, net 102                
Cumulative net losses and loss adjustment expenses paid 274 274 0            
Retroactive reinsurance contracts | Accident Year 2012 | Contracts incepting in 2017                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 1,158 1,295 2,174 2,248          
IBNR loss and LAE reserves, net 1,158                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0          
Retroactive reinsurance contracts | Accident Year 2012 | Contracts incepting in 2015                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 4,480 6,817 11,482 11,820 15,400 15,400      
IBNR loss and LAE reserves, net 4,480                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0      
Retroactive reinsurance contracts | Accident Year 2012 | Contracts incepting in 2014                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 4,778 4,778 9,045 10,230 9,655 10,930 12,343    
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 4,778 0 0 0 0 0 0    
Retroactive reinsurance contracts | Accident Year 2012 | Contracts incepting in 2013                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 7,853 7,853 7,853 7,853 7,853 7,853 7,853 10,197  
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 7,853 7,853 7,853 7,853 7,853 7,853 3,113 0  
Retroactive reinsurance contracts | Accident Year 2012 | Contracts incepting in 2019                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 1,286 1,211              
IBNR loss and LAE reserves, net 1,286                
Cumulative net losses and loss adjustment expenses paid 0 0              
Retroactive reinsurance contracts | Accident Year 2012 | Contracts incepting in 2020                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 177                
IBNR loss and LAE reserves, net 177                
Cumulative net losses and loss adjustment expenses paid 0                
Retroactive reinsurance contracts | Accident Year 2013 | Contracts incepting in 2018                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 2,072 2,072 2,300            
IBNR loss and LAE reserves, net 148                
Cumulative net losses and loss adjustment expenses paid 1,924 1,924 0            
Retroactive reinsurance contracts | Accident Year 2013 | Contracts incepting in 2017                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 1,783 2,000 3,365 3,460          
IBNR loss and LAE reserves, net 1,783                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0          
Retroactive reinsurance contracts | Accident Year 2013 | Contracts incepting in 2015                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 5,510 8,432 14,216 14,600 18,995 18,995      
IBNR loss and LAE reserves, net 5,510                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0      
Retroactive reinsurance contracts | Accident Year 2013 | Contracts incepting in 2014                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 7,493 7,493 14,185 16,045 15,143 17,142 19,174    
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 7,493 0 0 0 0 0 0    
Retroactive reinsurance contracts | Accident Year 2013 | Contracts incepting in 2013                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 3,779 3,779 3,779 3,779 3,779 3,779 3,779 4,908  
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 3,779 3,779 3,779 3,779 3,779 3,779 1,498 0  
Retroactive reinsurance contracts | Accident Year 2013 | Contracts incepting in 2019                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 2,152 1,983              
IBNR loss and LAE reserves, net 2,152                
Cumulative net losses and loss adjustment expenses paid 0 0              
Retroactive reinsurance contracts | Accident Year 2013 | Contracts incepting in 2020                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 255                
IBNR loss and LAE reserves, net 255                
Cumulative net losses and loss adjustment expenses paid 0                
Retroactive reinsurance contracts | Accident Year 2014 | Contracts incepting in 2018                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 5,466 5,466 6,000            
IBNR loss and LAE reserves, net 241                
Cumulative net losses and loss adjustment expenses paid 5,225 5,225 0            
Retroactive reinsurance contracts | Accident Year 2014 | Contracts incepting in 2017                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 5,101 5,768 9,765 9,894          
IBNR loss and LAE reserves, net 5,101                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0          
Retroactive reinsurance contracts | Accident Year 2014 | Contracts incepting in 2015                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 11,971 18,953 32,143 32,545 41,992 41,992      
IBNR loss and LAE reserves, net 11,971                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0      
Retroactive reinsurance contracts | Accident Year 2014 | Contracts incepting in 2014                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 4,245 4,245 8,035 9,089 8,578 9,711 10,851    
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 4,245 0 0 0 0 0 0    
Retroactive reinsurance contracts | Accident Year 2014 | Contracts incepting in 2013                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0 0  
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0 0  
Retroactive reinsurance contracts | Accident Year 2014 | Contracts incepting in 2019                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 4,750 4,328              
IBNR loss and LAE reserves, net 4,750                
Cumulative net losses and loss adjustment expenses paid 0 0              
Retroactive reinsurance contracts | Accident Year 2014 | Contracts incepting in 2020                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 630                
IBNR loss and LAE reserves, net 630                
Cumulative net losses and loss adjustment expenses paid 0                
Retroactive reinsurance contracts | Accident Year 2015 | Contracts incepting in 2018                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 12,092 12,092 13,184            
IBNR loss and LAE reserves, net 330                
Cumulative net losses and loss adjustment expenses paid 11,762 11,762 0            
Retroactive reinsurance contracts | Accident Year 2015 | Contracts incepting in 2017                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 6,703 7,570 12,805 13,002          
IBNR loss and LAE reserves, net 6,703                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0          
Retroactive reinsurance contracts | Accident Year 2015 | Contracts incepting in 2015                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 913 913 1,395 1,788 2,596 2,596      
IBNR loss and LAE reserves, net 913                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0      
Retroactive reinsurance contracts | Accident Year 2015 | Contracts incepting in 2014                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0    
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0    
Retroactive reinsurance contracts | Accident Year 2015 | Contracts incepting in 2013                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0 0  
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0 0  
Retroactive reinsurance contracts | Accident Year 2015 | Contracts incepting in 2019                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 6,815 6,197              
IBNR loss and LAE reserves, net 6,815                
Cumulative net losses and loss adjustment expenses paid 0 0              
Retroactive reinsurance contracts | Accident Year 2015 | Contracts incepting in 2020                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 811                
IBNR loss and LAE reserves, net 811                
Cumulative net losses and loss adjustment expenses paid 0                
Retroactive reinsurance contracts | Accident Year 2016 | Contracts incepting in 2018                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 18,488 18,488 20,093            
IBNR loss and LAE reserves, net 364                
Cumulative net losses and loss adjustment expenses paid 18,124 18,124 0            
Retroactive reinsurance contracts | Accident Year 2016 | Contracts incepting in 2017                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 12,708 14,397 24,408 24,643          
IBNR loss and LAE reserves, net 12,708                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0          
Retroactive reinsurance contracts | Accident Year 2016 | Contracts incepting in 2015                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0      
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0      
Retroactive reinsurance contracts | Accident Year 2016 | Contracts incepting in 2014                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0    
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0    
Retroactive reinsurance contracts | Accident Year 2016 | Contracts incepting in 2013                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0 0  
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0 0  
Retroactive reinsurance contracts | Accident Year 2016 | Contracts incepting in 2019                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 12,106 10,858              
IBNR loss and LAE reserves, net 12,106                
Cumulative net losses and loss adjustment expenses paid 0 0              
Retroactive reinsurance contracts | Accident Year 2016 | Contracts incepting in 2020                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 2,089                
IBNR loss and LAE reserves, net 2,090                
Cumulative net losses and loss adjustment expenses paid 0                
Retroactive reinsurance contracts | Accident Year 2017 | Contracts incepting in 2018                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 16,439 16,439 17,847            
IBNR loss and LAE reserves, net 280                
Cumulative net losses and loss adjustment expenses paid 16,159 16,159 0            
Retroactive reinsurance contracts | Accident Year 2017 | Contracts incepting in 2017                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 26,090 29,719 50,588 50,570          
IBNR loss and LAE reserves, net 26,090                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0          
Retroactive reinsurance contracts | Accident Year 2017 | Contracts incepting in 2015                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0      
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0      
Retroactive reinsurance contracts | Accident Year 2017 | Contracts incepting in 2014                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0    
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0    
Retroactive reinsurance contracts | Accident Year 2017 | Contracts incepting in 2013                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0 0  
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0 0  
Retroactive reinsurance contracts | Accident Year 2017 | Contracts incepting in 2019                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 14,309 12,908              
IBNR loss and LAE reserves, net 14,309                
Cumulative net losses and loss adjustment expenses paid 0 0              
Retroactive reinsurance contracts | Accident Year 2017 | Contracts incepting in 2020                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 2,319                
IBNR loss and LAE reserves, net 2,319                
Cumulative net losses and loss adjustment expenses paid 0                
Retroactive reinsurance contracts | Accident Year 2018 | Contracts incepting in 2018                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 14,240 14,240 15,396            
IBNR loss and LAE reserves, net 101                
Cumulative net losses and loss adjustment expenses paid 14,139 14,139 0            
Retroactive reinsurance contracts | Accident Year 2018 | Contracts incepting in 2017                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0          
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0          
Retroactive reinsurance contracts | Accident Year 2018 | Contracts incepting in 2015                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0      
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0      
Retroactive reinsurance contracts | Accident Year 2018 | Contracts incepting in 2014                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0    
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0    
Retroactive reinsurance contracts | Accident Year 2018 | Contracts incepting in 2013                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0 0  
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0 0  
Retroactive reinsurance contracts | Accident Year 2018 | Contracts incepting in 2019                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 18,544 16,769              
IBNR loss and LAE reserves, net 18,544                
Cumulative net losses and loss adjustment expenses paid 0 0              
Retroactive reinsurance contracts | Accident Year 2018 | Contracts incepting in 2020                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 2,336                
IBNR loss and LAE reserves, net 2,336                
Cumulative net losses and loss adjustment expenses paid 0                
Retroactive reinsurance contracts | Accident Year 2019 | Contracts incepting in 2018                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0            
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0            
Retroactive reinsurance contracts | Accident Year 2019 | Contracts incepting in 2017                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0          
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0          
Retroactive reinsurance contracts | Accident Year 2019 | Contracts incepting in 2015                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0      
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0      
Retroactive reinsurance contracts | Accident Year 2019 | Contracts incepting in 2014                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0    
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0    
Retroactive reinsurance contracts | Accident Year 2019 | Contracts incepting in 2013                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0 0  
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0 0  
Retroactive reinsurance contracts | Accident Year 2019 | Contracts incepting in 2019                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 39,913 35,527              
IBNR loss and LAE reserves, net 39,913                
Cumulative net losses and loss adjustment expenses paid 0 0              
Retroactive reinsurance contracts | Accident Year 2019 | Contracts incepting in 2020                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 3,337                
IBNR loss and LAE reserves, net 3,337                
Cumulative net losses and loss adjustment expenses paid 0                
Retroactive reinsurance contracts | Accident Year 2020 | Contracts incepting in 2018                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0            
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0            
Retroactive reinsurance contracts | Accident Year 2020 | Contracts incepting in 2017                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0          
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0          
Retroactive reinsurance contracts | Accident Year 2020 | Contracts incepting in 2015                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0      
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0      
Retroactive reinsurance contracts | Accident Year 2020 | Contracts incepting in 2014                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0    
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 0 0 0 0 0    
Retroactive reinsurance contracts | Accident Year 2020 | Contracts incepting in 2013                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0 0 0 0 0 0 0  
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0  
Retroactive reinsurance contracts | Accident Year 2020 | Contracts incepting in 2019                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 0 0              
IBNR loss and LAE reserves, net 0                
Cumulative net losses and loss adjustment expenses paid 0 $ 0              
Retroactive reinsurance contracts | Accident Year 2020 | Contracts incepting in 2020                  
Claims Development [Line Items]                  
Loss and loss adjustment expenses incurred, net 7,540                
IBNR loss and LAE reserves, net 7,541                
Cumulative net losses and loss adjustment expenses paid $ 0