Losses and LAE - Reserve for Losses and LAE by Segment (Details) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Dec. 31, 2025 |
Mar. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|---|---|
| Liability for Claims and Claims Adjustment Expense [Line Items] | ||||
| Total reserve for losses and LAE | $ 1,822,619 | $ 399,946 | ||
| Mortgage | ||||
| Liability for Claims and Claims Adjustment Expense [Line Items] | ||||
| Total reserve for losses and LAE | 406,938 | $ 399,946 | $ 369,090 | $ 354,431 |
| Specialty | ||||
| Liability for Claims and Claims Adjustment Expense [Line Items] | ||||
| Total reserve for losses and LAE | 1,415,681 | |||
| Specialty | Reserve for losses and LAE | ||||
| Liability for Claims and Claims Adjustment Expense [Line Items] | ||||
| Total reserve for losses and LAE | 1,379,208 | |||
| Specialty | VOBA Intangible Asset | ||||
| Liability for Claims and Claims Adjustment Expense [Line Items] | ||||
| Total reserve for losses and LAE | $ 36,473 |