Unpaid Losses and Loss Adjustment Expenses - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Liability for Claims and Claims Adjustment Expense [Line Items]
Decrease in losses and loss adjustment expenses	$ 3,200,000
Decrease in losses and loss adjustment expenses, percentage	23.30%
Losses and loss adjustment expenses, net	$ 10,520,000	$ 13,713,000
Prior year adjustments	461,000	1,213,000
Development expenses, net	102,019,000	84,261,000	$ 103,805,000	$ 82,888,000
Prior year claims and claims adjustment expenses		2,400,000
Loss Portfolio Transfer (LPT)
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year claims and claims adjustment expenses		20,000,000
Accident Year 2022 | Commercial Line
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year adjustments	47,000
Accident Year 2023
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year adjustments		1,200,000
Accident Year 2023 | Commercial Line
Liability for Claims and Claims Adjustment Expense [Line Items]
Losses and loss adjustment expenses, net		817,000
Accident Year 2023 | Personal Line
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year adjustments	508,000	$ 396,000
Accident Year 2024
Liability for Claims and Claims Adjustment Expense [Line Items]
Decrease in losses and loss adjustment expenses	3,900,000
Accident Year 2019 and Prior Accident Years | Loss Portfolio Transfer (LPT)
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year adjustments	1,800,000
Development expenses, net	$ 0