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Reinsurance - Summary of Total Assets and Maximum Exposure Loss (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]    
Total VIE Assets $ 5,927,506 $ 5,723,797
VIE    
Variable Interest Entity [Line Items]    
Total VIE Assets 1,773,085  
Maximum Exposure to Loss, On - Balance Sheet (11,315)  
Maximum Exposure to Loss, Off - Balance Sheet 519  
Maximum Exposure to Loss (10,796)  
VIE | Radnor Re 2019-1 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 325,537  
Maximum Exposure to Loss, On - Balance Sheet (2,218)  
Maximum Exposure to Loss, Off - Balance Sheet 90  
Maximum Exposure to Loss (2,128)  
VIE | Radnor Re 2020-1 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 395,889  
Maximum Exposure to Loss, On - Balance Sheet (1,286)  
Maximum Exposure to Loss, Off - Balance Sheet 158  
Maximum Exposure to Loss (1,128)  
VIE | Radnor Re 2021-1 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 414,005  
Maximum Exposure to Loss, On - Balance Sheet (4,657)  
Maximum Exposure to Loss, Off - Balance Sheet 98  
Maximum Exposure to Loss (4,559)  
VIE | Radnor Re 2021-2 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 399,786  
Maximum Exposure to Loss, On - Balance Sheet (3,849)  
Maximum Exposure to Loss, Off - Balance Sheet 95  
Maximum Exposure to Loss (3,754)  
VIE | Radnor Re 2022-1 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 237,868  
Maximum Exposure to Loss, On - Balance Sheet 695  
Maximum Exposure to Loss, Off - Balance Sheet 78  
Maximum Exposure to Loss $ 773