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Reinsurance - Summary of Total Assets and Maximum Exposure Loss (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]    
Total VIE Assets $ 5,556,904 $ 5,722,174
VIE    
Variable Interest Entity [Line Items]    
Total VIE Assets 2,226,206  
Maximum Exposure to Loss, On - Balance Sheet (4,432)  
Maximum Exposure to Loss, Off - Balance Sheet 568  
Total (3,864)  
VIE | Radnor Re 2018-1 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 242,123  
Maximum Exposure to Loss, On - Balance Sheet 369  
Maximum Exposure to Loss, Off - Balance Sheet 25  
Total 394  
VIE | Radnor Re 2019-1 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 325,537  
Maximum Exposure to Loss, On - Balance Sheet (1,884)  
Maximum Exposure to Loss, Off - Balance Sheet 59  
Total (1,825)  
VIE | Radnor Re 2019-2 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 61,478  
Maximum Exposure to Loss, On - Balance Sheet (1,474)  
Maximum Exposure to Loss, Off - Balance Sheet 1  
Total (1,473)  
VIE | Radnor Re 2020-1 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 448,805  
Maximum Exposure to Loss, On - Balance Sheet (1,098)  
Maximum Exposure to Loss, Off - Balance Sheet 78  
Total (1,020)  
VIE | Radnor Re 2021-1 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 486,933  
Maximum Exposure to Loss, On - Balance Sheet (1,882)  
Maximum Exposure to Loss, Off - Balance Sheet 136  
Total (1,746)  
VIE | Radnor Re 2021-2 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 423,462  
Maximum Exposure to Loss, On - Balance Sheet 1,033  
Maximum Exposure to Loss, Off - Balance Sheet 220  
Total 1,253  
VIE | Radnor Re 2022-1 Ltd.    
Variable Interest Entity [Line Items]    
Total VIE Assets 237,868  
Maximum Exposure to Loss, On - Balance Sheet 504  
Maximum Exposure to Loss, Off - Balance Sheet 49  
Total $ 553