Reserves for Unpaid Losses and Loss Adjustment Expenses - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Prior accident years	$ (6,400)	$ 0
Current year incurred losses and loss adjustment expenses	$ 104,319	71,130
Southern California
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Current year incurred losses and loss adjustment expenses		$ 10,400