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Reinsurance - Schedule of Retained Aggregate Loss and Initial and Current Reinsurance Coverage (Details) - USD ($)
$ in Thousands
Jan. 27, 2025
Mar. 31, 2025
Reinsurance Policy, Type [Axis]: 2021 XOL    
Reinsurance Retention Policy [Line Items]    
Initial first layer retained loss   $ 671,000
Current first layer retained loss   663,000
Initial reinsurance coverage   206,000
Current reinsurance coverage   82,000
Reinsurance Policy, Type [Axis]: 2022-1 XOL    
Reinsurance Retention Policy [Line Items]    
Initial first layer retained loss   462,000
Current first layer retained loss   451,000
Initial reinsurance coverage   196,000
Current reinsurance coverage   160,000
Reinsurance Policy, Type [Axis]: 2022-2 XOL    
Reinsurance Retention Policy [Line Items]    
Initial first layer retained loss   385,000
Current first layer retained loss   374,000
Initial reinsurance coverage   25,000
Current reinsurance coverage   25,000
Reinsurance Policy, Type [Axis]: 2022-3 XOL    
Reinsurance Retention Policy [Line Items]    
Initial first layer retained loss   317,000
Current first layer retained loss   312,000
Initial reinsurance coverage   289,000
Current reinsurance coverage   154,000
Reinsurance Policy, Type [Axis]: 2022-4 XOL    
Reinsurance Retention Policy [Line Items]    
Initial first layer retained loss   264,000
Current first layer retained loss   260,000
Initial reinsurance coverage   36,000
Current reinsurance coverage   36,000
Reinsurance Policy, Type [Axis]: 2022-5 XOL    
Reinsurance Retention Policy [Line Items]    
Initial first layer retained loss   256,000
Current first layer retained loss   249,000
Initial reinsurance coverage   201,000
Current reinsurance coverage   157,000
Reinsurance Policy, Type [Axis]: 2023-1 XOL    
Reinsurance Retention Policy [Line Items]    
Initial first layer retained loss   360,000
Current first layer retained loss   358,000
Initial reinsurance coverage   180,000
Current reinsurance coverage   180,000
Reinsurance Policy, Type [Axis]: 2024-1 XOL    
Reinsurance Retention Policy [Line Items]    
Initial first layer retained loss   362,000
Current first layer retained loss   362,000
Initial reinsurance coverage   270,000
Current reinsurance coverage   270,000
Reinsurance Policy, Type [Axis]: 2024-2 XOL    
Reinsurance Retention Policy [Line Items]    
Initial first layer retained loss   134,000
Current first layer retained loss   134,000
Initial reinsurance coverage   90,000
Current reinsurance coverage   90,000
Reinsurance Policy, Type [Axis]: 2025-1 XOL    
Reinsurance Retention Policy [Line Items]    
Initial first layer retained loss   68,000
Current first layer retained loss   68,000
Initial reinsurance coverage   32,000
Current reinsurance coverage   32,000
Reinsurance Policy, Type [Axis]: 2025-2 XOL    
Reinsurance Retention Policy [Line Items]    
Initial first layer retained loss   57,000
Current first layer retained loss   57,000
Initial reinsurance coverage   5,000
Current reinsurance coverage   5,000
Reinsurance Policy, Type [Axis]: 2026-1 XOL    
Reinsurance Retention Policy [Line Items]    
Reinsurance coverage $ 260,000  
Reinsurance Policy, Type [Axis]: Mortgage Insurance-Linked Notes    
Reinsurance Retention Policy [Line Items]    
Current reinsurance coverage   488,000
Reinsurance Policy, Type [Axis]: Traditional Excess-of-Loss Reinsurance    
Reinsurance Retention Policy [Line Items]    
Current reinsurance coverage   1,191,000
Reinsurance Policy, Type [Axis]: Triangle Re 2021-2 Ltd.    
Reinsurance Retention Policy [Line Items]    
Initial first layer retained loss   189,000
Current first layer retained loss   187,000
Initial reinsurance coverage   303,000
Current reinsurance coverage   107,000
Reinsurance Policy, Type [Axis]: Triangle Re 2021-3 Ltd.    
Reinsurance Retention Policy [Line Items]    
Initial first layer retained loss   304,000
Current first layer retained loss   300,000
Initial reinsurance coverage   372,000
Current reinsurance coverage   161,000
Reinsurance Policy, Type [Axis]: Triangle Re 2023-1 Ltd.    
Reinsurance Retention Policy [Line Items]    
Initial first layer retained loss   244,000
Current first layer retained loss   243,000
Initial reinsurance coverage   248,000
Current reinsurance coverage   $ 220,000