Reinsurance - Schedule of Disaggregation of Reinsurance Recoverable by Financial Strength Rating and Aging Analysis (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	$ 687,288		$ 658,525
Less: allowance for credit losses	(1,700)	$ (1,700)	(1,700)	$ (1,800)	$ (2,300)	$ (1,600)
Total reinsurance recoverable, net	685,588		656,825
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments, Gross | Current
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	684,686		654,071
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments, Gross | Past Due
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	2,602		4,454
Federal and state pools
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	83,241		80,506
Federal and state pools | Current
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	83,241		80,506
Federal and state pools | Past Due
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	0		0
Other than federal and state pools
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	3,948		4,565
Other than federal and state pools | Current
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	3,785		4,488
Other than federal and state pools | Past Due
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	163		77
Total non-rated reinsurers
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	87,189		85,071
Total non-rated reinsurers | Current
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	87,026		84,994
Total non-rated reinsurers | Past Due
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	163		77
A++
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	84,615		82,487
A++ | Current
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	83,944		82,466
A++ | Past Due
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	671		21
A+
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	392,660		374,019
A+ | Current
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	392,094		371,132
A+ | Past Due
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	566		2,887
A
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	117,744		113,263
A | Current
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	116,631		111,883
A | Past Due
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	1,113		1,380
A-
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	5,080		3,685
A- | Current
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	4,991		3,596
A- | Past Due
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	89		89
Total rated reinsurers
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	600,099		573,454
Total rated reinsurers | Current
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	597,660		569,077
Total rated reinsurers | Past Due
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	$ 2,439		$ 4,377