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Segment, Geographic, and Product Line Information - Revenues by Underwriting Division (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Net written premiums	$ 128,333	$ 99,338	$ 331,238	$ 239,728
Operating Segments | Underwriting Division | Casualty
Revenues from External Customers and Long-Lived Assets [Line Items]
Net written premiums	81,211	58,786	219,992	140,725
Operating Segments | Underwriting Division | Professional Liability
Revenues from External Customers and Long-Lived Assets [Line Items]
Net written premiums	25,467	24,261	64,272	62,301
Operating Segments | Underwriting Division | Healthcare Liability
Revenues from External Customers and Long-Lived Assets [Line Items]
Net written premiums	21,331	16,291	46,642	36,702
Operating Segments | Underwriting Division | Baleen Specialty
Revenues from External Customers and Long-Lived Assets [Line Items]
Net written premiums	$ 324	$ 0	$ 332	$ 0

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- Definition

Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums written.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-SubTopic 605
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479032/944-605-50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-SubTopic 605
-Topic 944
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479032/944-605-50-1

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- Definition

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+ References

No definition available.

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