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Losses and LAE - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2024 Default Payment | Dec. 31, 2023 Default | Dec. 31, 2022 Default
Number of payments missed for insured loans | Payment | 2 |  |
Mortgage Insurance revenues | TEXAS | Primary Risk In Force | Geographic Concentration Risk |  |  |
Concentration risk, percentage | 10.00% | 10.00% |
Mortgage Insurance revenues | TEXAS | New Insurance Written | Geographic Concentration Risk |  |  |
Concentration risk, percentage | 11.00% | 13.00% | 12.00%
Primary Mortgage Product | Mortgage Insurance revenues |  |  |
New primary defaults | Default | 50,535 | 44,007 | 37,738
Default to claim rate estimate, gross, for new defaults | 7.50% | 8.00% | 8.00%
Claim Severity rate of defaulted risk exposure | 89.00% | 98.00% |

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