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Losses and LAE - Net Outstanding Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Total gross reserve for losses and LAE | $ 360,326 | $ 370,148 |  |
Mortgage insurance |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Reserve for losses and LAE, net of reinsurance | 308,290 |  |  |
Reinsurance recoverable on unpaid claims | 34,144 | 25,074 | $ 24,727 | $ 66,676
Unallocated LAE | 11,997 |  |  |
Total gross reserve for losses and LAE | 354,431 | $ 364,923 | $ 420,955 | $ 823,136
Mortgage insurance | Mortgage insurance |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |
Reserve for losses and LAE, net of reinsurance | $ 308,290 |  |  |

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