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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
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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

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- Definition Amount per policy of risk ceded to reinsurer in excess of risk undertaken originally by insurer that is not ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479838/944-20-50-3 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479838/944-20-50-3 + Details
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