Segment, Geographic, and Product Line Information - Schedule of Revenues by Underwriting Division (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||
| Net written premiums | $ 140,342 | $ 116,769 |
| Operating Segments | Underwriting Division | Casualty | ||
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||
| Net written premiums | 95,150 | 82,604 |
| Operating Segments | Underwriting Division | Professional Liability | ||
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||
| Net written premiums | 16,138 | 15,959 |
| Operating Segments | Underwriting Division | Healthcare Liability | ||
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||
| Net written premiums | 20,643 | 16,147 |
| Operating Segments | Underwriting Division | Baleen Specialty | ||
| Revenues from External Customers and Long-Lived Assets [Line Items] | ||
| Net written premiums | $ 8,411 | $ 2,059 |