Summary of Investments - Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available-For-Sale, Amortized Cost
Due in one year or less	$ 74,293
Due after one year through five years	524,463
Due after five years through 10 years	523,999
Due after 10 years	321,300
Amortized Cost	1,771,041	$ 1,662,680
Available-For-Sale, Fair Value
Due in one year or less	74,066
Due after one year through five years	515,126
Due after five years through 10 years	496,643
Due after 10 years	304,810
Fair Value	1,686,502	1,551,336
Asset-backed securities
Available-For-Sale, Amortized Cost
Securities not categorized by contractual maturity	3,394
Amortized Cost	3,394	3,932
Available-For-Sale, Fair Value
Securities not categorized by contractual maturity	3,831
Fair Value	3,831	4,253
Mortgage-backed securities
Available-For-Sale, Amortized Cost
Securities not categorized by contractual maturity	23,800
Amortized Cost	23,800	20,450
Available-For-Sale, Fair Value
Securities not categorized by contractual maturity	21,483
Fair Value	21,483	$ 17,700
Collateralized mortgage obligations
Available-For-Sale, Amortized Cost
Securities not categorized by contractual maturity	299,792
Available-For-Sale, Fair Value
Securities not categorized by contractual maturity	270,544
Total fixed maturities
Available-For-Sale, Amortized Cost
Amortized Cost	1,771,041
Available-For-Sale, Fair Value
Fair Value	$ 1,686,503

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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