Reinsurance - Disaggregation of Reinsurance Recoverable by Financial Strength Rating and Aging Analysis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	$ 653,085	$ 658,525
Less: allowance for credit losses	(1,700)	(1,700)	$ (2,300)	$ (1,600)
Total reinsurance recoverable, net	651,385	656,825
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments, Gross
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	653,085
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments, Gross | Current
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	650,685	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	2,400	4,454
Federal and state pools
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	77,799	80,506
Federal and state pools | Current
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	77,799	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	4,639	4,565
Other than federal and state pools | Current
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	4,135	4,488
Other than federal and state pools | Past Due
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	504	77
Total non-rated reinsurers
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	82,438	85,071
Total non-rated reinsurers | Current
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	81,934	84,994
Total non-rated reinsurers | Past Due
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	504	77
A++
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	83,425	82,487
A++ | Current
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	83,372	82,466
A++ | Past Due
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	53	21
A+
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	367,600	374,019
A+ | Current
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	366,428	371,132
A+ | Past Due
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	1,172	2,887
A
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	115,668	113,263
A | Current
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	115,086	111,883
A | Past Due
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	582	1,380
A-
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	3,954	3,685
A- | Current
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	3,865	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	570,647	573,454
Total rated reinsurers | Current
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	568,751	569,077
Total rated reinsurers | Past Due
Reinsurance Recoverable, Credit Quality Indicator [Line Items]
Total reinsurance recoverable, gross	$ 1,896	$ 4,377