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Losses and LAE - Additional Disclosures: Cumulative Paid Claims / Reconciliation of Outstanding Liabilities (Details) - Mortgage insurance - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | $ 1,196,674 |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | 1,560,413 |  |  |  |  |  |  |  |  |
Mortgage |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Liabilities for claims, net of reinsurance | 385,945 |  |  |  |  |  |  |  |  |
2013 |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | 395,630 | $ 395,292 | $ 395,093 | $ 392,818 | $ 388,688 | $ 379,036 | $ 357,087 | $ 307,361 | $ 191,040 | $ 34,504
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
2014 |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | 255,981 | 256,107 | 255,742 | 252,619 | 246,611 | 233,607 | 200,422 | 115,852 | 13,108 |
Incurred losses, net of reinsurance | 257,773 | 260,254 | 261,377 | 261,507 | 260,098 | 264,620 | 265,891 | 247,074 | $ 337,784 |
2015 |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | 176,823 | 175,874 | 174,812 | 172,645 | 163,916 | 142,421 | 84,271 | 10,479 |  |
Incurred losses, net of reinsurance | 180,435 | 182,647 | 184,066 | 183,546 | 183,952 | 178,042 | 198,186 | $ 222,555 |  |
2016 |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | 139,539 | 138,525 | 137,306 | 134,115 | 119,357 | 76,616 | 11,061 |  |  |
Incurred losses, net of reinsurance | 145,267 | 148,349 | 148,640 | 148,811 | 149,753 | 165,440 | $ 201,016 |  |  |
2017 |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | 112,445 | 111,458 | 108,484 | 99,678 | 66,585 | 24,653 |  |  |  |
Incurred losses, net of reinsurance | 122,407 | 126,989 | 130,274 | 133,357 | 151,802 | $ 180,851 |  |  |  |
2018 |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | 62,968 | 60,926 | 54,625 | 36,066 | 5,584 |  |  |  |  |
Incurred losses, net of reinsurance | 75,262 | 88,252 | 95,534 | 116,634 | $ 131,513 |  |  |  |  |
2019 |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | 35,594 | 28,896 | 18,703 | 4,220 |  |  |  |  |  |
Incurred losses, net of reinsurance | 66,466 | 109,416 | 136,860 | $ 143,475 |  |  |  |  |  |
2020 |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | 14,635 | 9,867 | 4,148 |  |  |  |  |  |  |
Incurred losses, net of reinsurance | 87,213 | 408,809 | $ 504,160 |  |  |  |  |  |  |
2021 |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | 2,561 | 1,112 |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | 72,475 | $ 156,328 |  |  |  |  |  |  |  |
2022 |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | 498 |  |  |  |  |  |  |  |  |
Incurred losses, net of reinsurance | 155,908 |  |  |  |  |  |  |  |  |
All outstanding liabilities before 2013, net of reinsurance |  |  |  |  |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |  |  |  |  |
Cumulative paid claims, net of reinsurance | $ 22,206 |  |  |  |  |  |  |  |  |

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