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Reinsurance - Summary of Total Assets and Maximum Exposure Loss (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Variable Interest Entity [Line Items]    
Total VIE Assets $ 6,094,200 $ 5,723,797
Radnor Re 2022-1 Ltd. | Reinsurance Policy, Type [Axis]: Vintage Year Oct 2021 - Jul 2022    
Variable Interest Entity [Line Items]    
Reinsurance, Remaining Reinsurance In Force 237,868  
VIE    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss, On - Balance Sheet (9,487)  
Maximum Exposure to Loss, Off - Balance Sheet 326  
Maximum Exposure to Loss (9,161)  
VIE | Radnor Re 2019-1 Ltd.    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss, On - Balance Sheet 69  
Maximum Exposure to Loss, Off - Balance Sheet 3  
Maximum Exposure to Loss 72  
VIE | Radnor Re 2020-1 Ltd.    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss, On - Balance Sheet (245)  
Maximum Exposure to Loss, Off - Balance Sheet 12  
Maximum Exposure to Loss (233)  
VIE | Radnor Re 2021-1 Ltd.    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss, On - Balance Sheet (4,874)  
Maximum Exposure to Loss, Off - Balance Sheet 60  
Maximum Exposure to Loss (4,814)  
VIE | Radnor Re 2021-2 Ltd.    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss, On - Balance Sheet (5,231)  
Maximum Exposure to Loss, Off - Balance Sheet 92  
Maximum Exposure to Loss (5,139)  
VIE | Radnor Re 2022-1 Ltd.    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss, On - Balance Sheet 574  
Maximum Exposure to Loss, Off - Balance Sheet 72  
Maximum Exposure to Loss 646  
VIE | Radnor Re 2023-1 Ltd.    
Variable Interest Entity [Line Items]    
Maximum Exposure to Loss, On - Balance Sheet 220  
Maximum Exposure to Loss, Off - Balance Sheet 87  
Maximum Exposure to Loss $ 307