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Losses and LAE - Schedule of Cumulative Paid Claims / Reconciliation of Outstanding Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Mortgage insurance |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | $ 573,940 |  |  |  |  |  |  |  |  |
Mortgage insurance |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Liabilities for claims, net of reinsurance | 308,290 |  |  |  |  |  |  |  |  |
Mortgage insurance | Mortgage insurance |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Liabilities for claims, net of reinsurance | 308,290 |  |  |  |  |  |  |  |  |
2015 | Mortgage insurance |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | 177,883 | $ 177,237 | $ 176,823 | $ 175,874 | $ 174,812 | $ 172,645 | $ 163,916 | $ 142,421 | $ 84,271 | $ 10,479
2016 | Mortgage insurance |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | 139,937 | 139,651 | 139,539 | 138,525 | 137,306 | 134,115 | 119,357 | 76,616 | $ 11,061 |
2017 | Mortgage insurance |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | 113,497 | 113,027 | 112,445 | 111,458 | 108,484 | 99,678 | 66,585 | $ 24,653 |  |
2018 | Mortgage insurance |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | 64,015 | 63,603 | 62,968 | 60,926 | 54,625 | 36,066 | $ 5,584 |  |  |
2019 | Mortgage insurance |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | 39,082 | 37,960 | 35,594 | 28,896 | 18,703 | $ 4,220 |  |  |  |
2020 | Mortgage insurance |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | 19,465 | 17,884 | 14,635 | 9,867 | $ 4,148 |  |  |  |  |
2021 | Mortgage insurance |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | 6,043 | 4,409 | 2,561 | $ 1,112 |  |  |  |  |  |
2022 | Mortgage insurance |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | 6,699 | 2,867 | $ 498 |  |  |  |  |  |  |
2023 | Mortgage insurance |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | 6,201 | $ 246 |  |  |  |  |  |  |  |
2024 | Mortgage insurance |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | 1,118 |  |  |  |  |  |  |  |  |
All outstanding liabilities before 2015, net of reinsurance | Mortgage insurance |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | $ 7,411 |  |  |  |  |  |  |  |  |

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