Unpaid Losses and Loss Adjustment Expenses - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Liability For Claims And Claims Adjustment Expense [Line Items]
Losses and loss adjustment expenses, net	$ 16,671,000	$ 16,159,000	$ 56,940,000	$ 53,447,000
Prior year adjustments	3,130,000	3,646,000	18,175,000	15,634,000
Winter Storm Uri
Liability For Claims And Claims Adjustment Expense [Line Items]
Losses and loss adjustment expenses, net		2,000,000.0
Commercial Lines1
Liability For Claims And Claims Adjustment Expense [Line Items]
Prior year adjustments	2,700,000	3,400,000	17,700,000	14,700,000
Personal Lines
Liability For Claims And Claims Adjustment Expense [Line Items]
Prior year adjustments	381,000	290,000	430,000	926,000
2019 Accident Year
Liability For Claims And Claims Adjustment Expense [Line Items]
Prior year adjustments	2,300,000	1,000,000.0	14,300,000	3,400,000
2021 Accident Year
Liability For Claims And Claims Adjustment Expense [Line Items]
Prior year adjustments	1,800,000		1,700,000
2020 Accident Year
Liability For Claims And Claims Adjustment Expense [Line Items]
Losses and loss adjustment expenses, net	$ 958,000
Prior year adjustments			$ 2,200,000	2,400,000
2017 Accident Year
Liability For Claims And Claims Adjustment Expense [Line Items]
Prior year adjustments		1,100,000		5,000,000.0
2018 Accident Year
Liability For Claims And Claims Adjustment Expense [Line Items]
Prior year adjustments		$ 1,400,000		$ 4,800,000