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Losses and LAE - Schedule of Net Incurred Losses and Paid Claims Development (Details) - Mortgage insurance $ in Thousands | Dec. 31, 2024 USD ($) Default | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
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Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | $ 874,819 |  |  |  |  |  |  |  |  |
2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | 178,738 | $ 179,344 | $ 180,435 | $ 182,647 | $ 184,066 | $ 183,546 | $ 183,952 | $ 178,042 | $ 198,186 | $ 222,555
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 2 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Defaults | Default | 42,607 |  |  |  |  |  |  |  |  |
2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | $ 140,962 | 142,521 | 145,267 | 148,349 | 148,640 | 148,811 | 149,753 | 165,440 | $ 201,016 |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 2 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Defaults | Default | 40,503 |  |  |  |  |  |  |  |  |
2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | $ 115,317 | 118,033 | 122,407 | 126,989 | 130,274 | 133,357 | 151,802 | $ 180,851 |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 3 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Defaults | Default | 42,888 |  |  |  |  |  |  |  |  |
2018 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | $ 66,583 | 70,145 | 75,262 | 88,252 | 95,534 | 116,634 | $ 131,513 |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 5 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Defaults | Default | 37,369 |  |  |  |  |  |  |  |  |
2019 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | $ 43,818 | 51,053 | 66,466 | 109,416 | 136,860 | $ 143,475 |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 9 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Defaults | Default | 40,985 |  |  |  |  |  |  |  |  |
2020 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | $ 27,266 | 39,584 | 87,213 | 408,809 | $ 504,160 |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 14 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Defaults | Default | 108,025 |  |  |  |  |  |  |  |  |
2021 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | $ 11,974 | 23,308 | 72,475 | $ 156,328 |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 11 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Defaults | Default | 37,470 |  |  |  |  |  |  |  |  |
2022 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | $ 24,044 | 71,300 | $ 155,908 |  |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 32 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Defaults | Default | 37,738 |  |  |  |  |  |  |  |  |
2023 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | $ 75,762 | $ 173,076 |  |  |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 0 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Defaults | Default | 44,007 |  |  |  |  |  |  |  |  |
2024 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | $ 190,355 |  |  |  |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 1,734 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Defaults | Default | 50,535 |  |  |  |  |  |  |  |  |

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