Investments - Schedule of Available-for-Sale Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	$ 1,377,965
Fixed maturity securities, available-for-sale	1,287,466	$ 1,324,476
Total fixed maturity securities, available-for-sale
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	1,377,965	1,405,136
Total investments available-for-sale, Gross Unrealized Gains	4,028	7,330
Total investments available-for-sale, Gross Unrealized Losses	(94,527)	(87,990)
Fixed maturity securities, available-for-sale	1,287,466	1,324,476
State and municipal
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	270,873	273,462
Total investments available-for-sale, Gross Unrealized Gains	1,221	1,834
Total investments available-for-sale, Gross Unrealized Losses	(27,084)	(26,459)
Fixed maturity securities, available-for-sale	245,010	248,837
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	330,117	336,064
Total investments available-for-sale, Gross Unrealized Gains	547	1,243
Total investments available-for-sale, Gross Unrealized Losses	(23,138)	(19,379)
Fixed maturity securities, available-for-sale	307,526	317,928
Corporate
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	522,750	530,408
Total investments available-for-sale, Gross Unrealized Gains	2,163	4,167
Total investments available-for-sale, Gross Unrealized Losses	(31,634)	(28,847)
Fixed maturity securities, available-for-sale	493,279	505,728
Commercial mortgage and asset-backed
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	227,720	235,302
Total investments available-for-sale, Gross Unrealized Gains	97	78
Total investments available-for-sale, Gross Unrealized Losses	(11,836)	(12,527)
Fixed maturity securities, available-for-sale	215,981	222,853
U.S. Treasury securities and obligations guaranteed by the U.S. government
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	26,505	29,900
Total investments available-for-sale, Gross Unrealized Gains	0	8
Total investments available-for-sale, Gross Unrealized Losses	(835)	(778)
Fixed maturity securities, available-for-sale	$ 25,670	$ 29,130