Unpaid Losses and Loss Adjustment Expenses - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Liability for Claims and Claims Adjustment Expense [Line Items]
Decrease in losses and loss adjustment expenses	$ 5,800,000
Decrease in losses and loss adjustment expenses, percentage	27.50%
Losses and loss adjustment expenses, net	$ 15,152,000	$ 20,911,000	$ 40,953,000	$ 53,943,000
Prior year adjustments	7,868,000	3,630,000	10,206,000	2,939,000
Development expenses, net	95,045,000	92,448,000	95,045,000	92,448,000	$ 100,428,000	$ 103,805,000	$ 88,499,000	$ 82,888,000
Prior year claims and claims adjustment expenses	12,200,000		12,200,000
Loss Portfolio Transfer (LPT)
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year claims and claims adjustment expenses	20,000,000		20,000,000
Accident Year 2021 | Commercial Line
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year adjustments	7,900,000
Accident Year 2020 Through 2022 | Commercial Line
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year adjustments		4,000,000		4,100,000
Accident Year 2020 Through 2022 | Personal Line
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year adjustments		414,000		$ 1,200,000
Accident Year 2020 Through 2023
Liability for Claims and Claims Adjustment Expense [Line Items]
Ultimate loss estimates in accident years	10,900,000		$ 10,900,000
Accident Year 2024
Liability for Claims and Claims Adjustment Expense [Line Items]
Decrease in losses and loss adjustment expenses	$ 10,000,000	$ 10,000,000