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Reinsurance - Summary of Total Assets and Maximum Exposure Loss (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]    
Total VIE Assets $ 5,983,315 $ 5,723,797
VIE    
Variable Interest Entity [Line Items]    
Total VIE Assets 1,070,650  
Maximum Exposure to Loss, On - Balance Sheet (8,590)  
Maximum Exposure to Loss, Off - Balance Sheet 284  
Maximum Exposure to Loss (8,306)  
VIE | Radnor Re 2019-1 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 21,467  
Maximum Exposure to Loss, On - Balance Sheet 77  
Maximum Exposure to Loss, Off - Balance Sheet 3  
Maximum Exposure to Loss 80  
VIE | Radnor Re 2020-1 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 52,691  
Maximum Exposure to Loss, On - Balance Sheet (238)  
Maximum Exposure to Loss, Off - Balance Sheet 13  
Maximum Exposure to Loss (225)  
VIE | Radnor Re 2021-1 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 374,172  
Maximum Exposure to Loss, On - Balance Sheet (4,631)  
Maximum Exposure to Loss, Off - Balance Sheet 71  
Maximum Exposure to Loss (4,560)  
VIE | Radnor Re 2021-2 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 384,452  
Maximum Exposure to Loss, On - Balance Sheet (4,660)  
Maximum Exposure to Loss, Off - Balance Sheet 116  
Maximum Exposure to Loss (4,544)  
VIE | Radnor Re 2022-1 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 237,868  
Maximum Exposure to Loss, On - Balance Sheet 862  
Maximum Exposure to Loss, Off - Balance Sheet 81  
Maximum Exposure to Loss $ 943