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Losses and LAE - Additional Disclosures: Claims Development (Details) - Mortgage insurance $ in Thousands | Dec. 31, 2022 USD ($) default | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
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Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | $ 1,560,413 |  |  |  |  |  |  |  |  |
2013 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | 397,207 | $ 398,820 | $ 399,317 | $ 399,356 | $ 400,243 | $ 402,259 | $ 404,333 | $ 401,444 | $ 405,334 | $ 505,732
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 5 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Defaults | default | 58,577 |  |  |  |  |  |  |  |  |
2014 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | $ 257,773 | 260,254 | 261,377 | 261,507 | 260,098 | 264,620 | 265,891 | 247,074 | $ 337,784 |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 6 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Defaults | default | 47,976 |  |  |  |  |  |  |  |  |
2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | $ 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 | $ 9 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Defaults | default | 42,607 |  |  |  |  |  |  |  |  |
2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | $ 145,267 | 148,349 | 148,640 | 148,811 | 149,753 | 165,440 | $ 201,016 |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 14 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Defaults | default | 40,503 |  |  |  |  |  |  |  |  |
2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | $ 122,407 | 126,989 | 130,274 | 133,357 | 151,802 | $ 180,851 |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 25 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Defaults | default | 42,888 |  |  |  |  |  |  |  |  |
2018 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | $ 75,262 | 88,252 | 95,534 | 116,634 | $ 131,513 |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 32 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Defaults | default | 37,369 |  |  |  |  |  |  |  |  |
2019 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | $ 66,466 | 109,416 | 136,860 | $ 143,475 |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 79 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Defaults | default | 40,985 |  |  |  |  |  |  |  |  |
2020 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | $ 87,213 | 408,809 | $ 504,160 |  |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 193 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Defaults | default | 108,025 |  |  |  |  |  |  |  |  |
2021 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | $ 72,475 | $ 156,328 |  |  |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 184 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Defaults | default | 37,470 |  |  |  |  |  |  |  |  |
2022 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | $ 155,908 |  |  |  |  |  |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 1,550 |  |  |  |  |  |  |  |  |
Cumulative Number of Reported Defaults | default | 37,738 |  |  |  |  |  |  |  |  |

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