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Short Duration Contracts - Claims development - Mortgage (Details) $ in Thousands | Dec. 31, 2022 USD ($) claims | Dec. 31, 2021 USD ($) | 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] |  |  |  |  |  |  |  |  |  |
Liabilities for losses and loss adjustment expenses, net of reinsurance | $ 13,445,271 |  |  |  |  |  |  |  |  |
Mortgage |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses and allocated loss adjustment expenses, net of reinsurance | 1,543,256 |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance | 1,156,723 |  |  |  |  |  |  |  |  |
All outstanding liabilities before 2012, net of reinsurance | 10,585 |  |  |  |  |  |  |  |  |
Liabilities for losses and loss adjustment expenses, net of reinsurance | 397,118 |  |  |  |  |  |  |  |  |
Mortgage | 2013 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses and allocated loss adjustment expenses, net of reinsurance | 390,299 | $ 391,324 | $ 391,062 | $ 390,987 | $ 393,149 | $ 395,693 | $ 405,809 | $ 411,793 | $ 419,668 | $ 469,311
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance | 388,036 | 387,879 | 387,894 | 386,853 | 382,200 | 373,909 | 353,189 | 308,956 | 203,957 | $ 41,447
Total of IBNR liabilities plus expected development on reported claims | $ 2 |  |  |  |  |  |  |  |  |
Cumulative number of paid claims | claims | 9,474 |  |  |  |  |  |  |  |  |
Mortgage | 2014 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses and allocated loss adjustment expenses, net of reinsurance | $ 260,554 | 262,829 | 262,682 | 261,091 | 265,992 | 266,027 | 279,434 | 297,151 | 316,095 |
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance | 257,232 | 256,875 | 256,285 | 254,175 | 247,038 | 233,879 | 201,925 | 129,159 | $ 20,099 |
Total of IBNR liabilities plus expected development on reported claims | $ 4 |  |  |  |  |  |  |  |  |
Cumulative number of paid claims | claims | 6,311 |  |  |  |  |  |  |  |  |
Mortgage | 2015 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses and allocated loss adjustment expenses, net of reinsurance | $ 188,649 | 190,560 | 190,913 | 189,235 | 194,677 | 198,001 | 197,238 | 222,790 |  |
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance | 184,955 | 184,025 | 183,472 | 180,321 | 171,337 | 151,222 | 92,431 | $ 16,159 |  |
Total of IBNR liabilities plus expected development on reported claims | $ 1 |  |  |  |  |  |  |  |  |
Cumulative number of paid claims | claims | 4,573 |  |  |  |  |  |  |  |  |
Mortgage | 2016 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses and allocated loss adjustment expenses, net of reinsurance | $ 137,415 | 141,657 | 142,392 | 140,608 | 148,715 | 170,532 | 183,556 |  |  |
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance | 132,387 | 131,717 | 131,161 | 127,286 | 113,357 | 72,201 | $ 11,462 |  |  |
Total of IBNR liabilities plus expected development on reported claims | $ 0 |  |  |  |  |  |  |  |  |
Cumulative number of paid claims | claims | 3,445 |  |  |  |  |  |  |  |  |
Mortgage | 2017 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses and allocated loss adjustment expenses, net of reinsurance | $ 102,005 | 109,242 | 108,181 | 107,255 | 132,220 | 179,376 |  |  |  |
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance | 91,645 | 89,756 | 87,317 | 78,650 | 48,112 | $ 8,622 |  |  |  |
Total of IBNR liabilities plus expected development on reported claims | $ (1) |  |  |  |  |  |  |  |  |
Cumulative number of paid claims | claims | 2,516 |  |  |  |  |  |  |  |  |
Mortgage | 2018 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses and allocated loss adjustment expenses, net of reinsurance | $ 71,976 | 87,962 | 89,120 | 96,357 | 132,318 |  |  |  |  |
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance | 58,687 | 55,853 | 50,135 | 31,478 | $ 3,966 |  |  |  |  |
Total of IBNR liabilities plus expected development on reported claims | $ (4) |  |  |  |  |  |  |  |  |
Cumulative number of paid claims | claims | 1,718 |  |  |  |  |  |  |  |  |
Mortgage | 2019 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses and allocated loss adjustment expenses, net of reinsurance | $ 63,485 | 110,362 | 119,253 | 108,424 |  |  |  |  |  |
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance | 34,178 | 29,102 | 20,105 | $ 2,899 |  |  |  |  |  |
Total of IBNR liabilities plus expected development on reported claims | $ 74 |  |  |  |  |  |  |  |  |
Cumulative number of paid claims | claims | 1,002 |  |  |  |  |  |  |  |  |
Mortgage | 2020 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses and allocated loss adjustment expenses, net of reinsurance | $ 78,334 | 373,533 | 420,003 |  |  |  |  |  |  |
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance | 7,740 | 4,144 | $ 1,040 |  |  |  |  |  |  |
Total of IBNR liabilities plus expected development on reported claims | $ 476 |  |  |  |  |  |  |  |  |
Cumulative number of paid claims | claims | 299 |  |  |  |  |  |  |  |  |
Mortgage | 2021 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses and allocated loss adjustment expenses, net of reinsurance | $ 77,212 | 144,375 |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance | 1,687 | $ 469 |  |  |  |  |  |  |  |
Total of IBNR liabilities plus expected development on reported claims | $ 379 |  |  |  |  |  |  |  |  |
Cumulative number of paid claims | claims | 72 |  |  |  |  |  |  |  |  |
Mortgage | 2022 |  |  |  |  |  |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |  |  |  |  |  |
Incurred losses and allocated loss adjustment expenses, net of reinsurance | $ 173,327 |  |  |  |  |  |  |  |  |
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance | 176 |  |  |  |  |  |  |  |  |
Total of IBNR liabilities plus expected development on reported claims | $ 2,147 |  |  |  |  |  |  |  |  |
Cumulative number of paid claims | claims | 7 |  |  |  |  |  |  |  |  |

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