Investments - Schedule of Available-for-Sale Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	$ 1,728,217
Fixed maturity securities, available-for-sale	1,597,695	$ 1,677,561
Fixed maturity securities
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	1,728,217	1,643,865
Total investments available-for-sale, Gross Unrealized Gains	1,580	46,253
Total investments available-for-sale, Gross Unrealized Losses	(132,102)	(12,557)
Fixed maturity securities, available-for-sale	1,597,695	1,677,561
State and municipal
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	340,365	323,773
Total investments available-for-sale, Gross Unrealized Gains	938	12,156
Total investments available-for-sale, Gross Unrealized Losses	(38,898)	(2,212)
Fixed maturity securities, available-for-sale	302,405	333,717
Residential mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	312,407	246,586
Total investments available-for-sale, Gross Unrealized Gains	392	2,384
Total investments available-for-sale, Gross Unrealized Losses	(22,244)	(2,339)
Fixed maturity securities, available-for-sale	290,555	246,631
Corporate
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	656,466	711,930
Total investments available-for-sale, Gross Unrealized Gains	215	26,119
Total investments available-for-sale, Gross Unrealized Losses	(49,860)	(5,714)
Fixed maturity securities, available-for-sale	606,821	732,335
Commercial mortgage and asset-backed
Debt Securities, Available-for-sale [Line Items]
Total fixed maturity securities, Cost or Amortized Cost	340,434	301,247
Total investments available-for-sale, Gross Unrealized Gains	4	4,941
Total investments available-for-sale, Gross Unrealized Losses	(18,234)	(1,700)
Fixed maturity securities, available-for-sale	322,204	304,488
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	78,545	60,329
Total investments available-for-sale, Gross Unrealized Gains	31	653
Total investments available-for-sale, Gross Unrealized Losses	(2,866)	(592)
Fixed maturity securities, available-for-sale	$ 75,710	$ 60,390

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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