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Segment Reporting - Schedule of Segment Reporting (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Revenues: |  |  |
Net premiums earned | $ 990,882 | $ 916,906 | $ 842,527
Net investment income | 222,070 | 186,139 | 124,409
Realized investment gains (losses), net | (2,350) | (7,204) | (13,172)
Income (loss) from other invested assets | 7,375 | (11,118) | 28,676
Other income | 24,927 | 25,036 | 18,384
Total revenues | 1,242,904 | 1,109,759 | 1,000,824
Losses and expenses: |  |  |
Provision (benefit) for losses and LAE | 81,220 | 31,542 | (174,704)
Compensation and benefits | 136,392 | 114,898 | 100,302
Premium and other taxes | 24,504 | 22,168 | 20,977
Ceding commission | (24,248) | (21,326) | (17,516)
Other underwriting and operating expenses | 134,226 | 109,341 | 67,970
Other underwriting and operating expenses | 270,874 | 225,081 | 171,733
Interest expense | 35,319 | 30,137 | 15,608
Income before income taxes | 855,491 | 822,999 | 988,187
Mortgage Insurance |  |  |
Losses and expenses: |  |  |
Other underwriting and operating expenses | 159,531 | 162,456 | 159,605
Interest expense | 0 | 0 | 0
Income before income taxes | 892,284 | 860,039 | 1,019,608
Mortgage Insurance | Operating Segments |  |  |
Revenues: |  |  |
Net premiums earned | 924,676 | 878,937 | 842,527
Net investment income | 183,341 | 159,868 | 112,285
Realized investment gains (losses), net | (2,343) | (6,392) | (1,829)
Income (loss) from other invested assets | 7,171 | (490) | 33,142
Other income | 14,152 | 20,692 | 18,384
Total revenues | 1,126,997 | 1,052,615 | 1,004,509
Losses and expenses: |  |  |
Provision (benefit) for losses and LAE | 75,182 | 30,120 | (174,704)
Compensation and benefits | 72,156 | 68,996 | 66,410
Premium and other taxes | 23,007 | 22,544 | 20,977
Ceding commission | (24,248) | (21,326) | (17,516)
Other underwriting and operating expenses | 44,829 | 44,968 | 41,634
Other underwriting and operating expenses | $ 115,744 | $ 115,182 | $ 111,505
Loss Ratio | 8.10% | 3.40% | (20.70%)
Expense Ratio | 17.30% | 18.50% | 18.90%
Combined Ratio | 25.40% | 21.90% | (1.80%)
Mortgage Insurance | Intersegment Eliminations |  |  |
Losses and expenses: |  |  |
Other underwriting and operating expenses | $ 43,787 | $ 47,274 | $ 48,100
Corporate Segment |  |  |
Losses and expenses: |  |  |
Other underwriting and operating expenses | 111,343 | 62,625 | 12,128
Interest expense | 35,319 | 30,137 | 15,608
Income before income taxes | (36,793) | (37,040) | (31,421)
Corporate Segment | Operating Segments |  |  |
Revenues: |  |  |
Net premiums earned | 66,206 | 37,969 | 0
Net investment income | 38,729 | 26,271 | 12,124
Realized investment gains (losses), net | (7) | (812) | (11,343)
Income (loss) from other invested assets | 204 | (10,628) | (4,466)
Other income | 10,775 | 4,344 | 0
Total revenues | 115,907 | 57,144 | (3,685)
Losses and expenses: |  |  |
Provision (benefit) for losses and LAE | 6,038 | 1,422 | 0
Compensation and benefits | 64,236 | 45,902 | 33,892
Premium and other taxes | 1,497 | (376) | 0
Ceding commission | 0 | 0 | 0
Other underwriting and operating expenses | 89,397 | 64,373 | 26,336
Other underwriting and operating expenses | 155,130 | 109,899 | 60,228
Corporate Segment | Intersegment Eliminations |  |  |
Losses and expenses: |  |  |
Other underwriting and operating expenses | $ (43,787) | $ (47,274) | $ (48,100)

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