Goodwill and Intangible Assets - Narrative (Details) - USD ($)	1 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 11, 2007
Business Combination [Line Items]
Goodwill impairment		$ 0	$ 0	$ 0
Goodwill		181,831,000	181,831,000	181,831,000
Accumulated goodwill impairment losses		99,600,000	99,600,000
Impairment of intangible assets		0	0	2,500,000
Amortization of intangible assets		363,000	363,000	363,000
Excess and Surplus Lines
Business Combination [Line Items]
Amortization of intangible assets		363,000	363,000	363,000
Excess and Surplus Lines | Trademarks
Business Combination [Line Items]
Amortization of intangible assets		0	0
Specialty Admitted Insurance
Business Combination [Line Items]
Amortization of intangible assets		$ 0	$ 0	$ 0
Specialty Admitted Insurance | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Individual Risk Workers' Compensation | Trademarks
Business Combination [Line Items]
Impairment of intangible assets	$ 2,500,000
James River Group, Inc.
Business Combination [Line Items]
Percentage of outstanding shares acquired					100.00%