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Losses and LAE - Reserve for Losses and LAE by Segment (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Total reserve for losses and LAE | $ 374,945 | $ 360,326 |  |
Mortgage insurance |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Total reserve for losses and LAE | 369,090 | 354,431 | $ 356,673 | $ 364,923
Title insurance |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Total reserve for losses and LAE | 5,855 | 5,895 |  |
Primary case | Mortgage insurance |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Total reserve for losses and LAE | 347,996 | 336,553 |  |
Primary IBNR and LAE | Mortgage insurance |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Total reserve for losses and LAE | 13,827 | 13,399 |  |
Pool and other | Mortgage insurance |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Total reserve for losses and LAE | $ 7,267 | $ 4,479 |  |

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