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Reinsurance - Summary of Total Assets and Maximum Exposure Loss (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]    
Total VIE Assets $ 5,521,102 $ 5,722,174
VIE    
Variable Interest Entity [Line Items]    
Total VIE Assets 2,179,706  
Maximum Exposure to Loss, On - Balance Sheet (9,608)  
Maximum Exposure to Loss, Off - Balance Sheet 507  
Total (9,101)  
VIE | Radnor Re 2018-1 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 242,123  
Maximum Exposure to Loss, On - Balance Sheet 32  
Maximum Exposure to Loss, Off - Balance Sheet 30  
Total 62  
VIE | Radnor Re 2019-1 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 325,537  
Maximum Exposure to Loss, On - Balance Sheet (2,457)  
Maximum Exposure to Loss, Off - Balance Sheet 67  
Total (2,390)  
VIE | Radnor Re 2019-2 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 92,252  
Maximum Exposure to Loss, On - Balance Sheet (1,526)  
Maximum Exposure to Loss, Off - Balance Sheet 3  
Total (1,523)  
VIE | Radnor Re 2020-1 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 495,889  
Maximum Exposure to Loss, On - Balance Sheet (1,836)  
Maximum Exposure to Loss, Off - Balance Sheet 86  
Total (1,750)  
VIE | Radnor Re 2020-2 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 64,499  
Maximum Exposure to Loss, On - Balance Sheet (470)  
Maximum Exposure to Loss, Off - Balance Sheet 2  
Total (468)  
VIE | Radnor Re 2021-1 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 519,999  
Maximum Exposure to Loss, On - Balance Sheet (1,616)  
Maximum Exposure to Loss, Off - Balance Sheet 155  
Total (1,461)  
VIE | Radnor Re 2021-2 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 439,407  
Maximum Exposure to Loss, On - Balance Sheet (1,735)  
Maximum Exposure to Loss, Off - Balance Sheet 164  
Total $ (1,571)