Summary of Investments - Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Amortized Cost
Due in one year or less	$ 49,564
Due after one year through five years	495,560
Due after five years through 10 years	515,165
Due after 10 years	331,230
Amortized Cost	1,681,117	$ 1,662,680
Fair Value
Due in one year or less	49,282
Due after one year through five years	477,938
Due after five years through 10 years	478,898
Due after 10 years	308,458
Fair Value	1,568,382	1,551,336
Asset-backed securities
Amortized Cost
Securities not categorized by contractual maturity	3,755
Amortized Cost	3,755	3,932
Fair Value
Securities not categorized by contractual maturity	4,127
Fair Value	4,127	4,253
Mortgage-backed securities
Amortized Cost
Securities not categorized by contractual maturity	25,339
Amortized Cost	25,339	20,450
Fair Value
Securities not categorized by contractual maturity	22,673
Fair Value	22,673	$ 17,700
Collateralized mortgage obligations
Amortized Cost
Securities not categorized by contractual maturity	260,504
Fair Value
Securities not categorized by contractual maturity	227,007
Fixed maturities
Amortized Cost
Amortized Cost	1,681,117
Fair Value
Fair Value	$ 1,568,383

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