Investments - Schedule of Contract Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Cost or Amortized Cost
One year or less	$ 65,952
After one year through five years	431,295
After five years through ten years	325,615
After ten years	252,514
Residential mortgage-backed	312,407
Commercial mortgage and asset-backed	340,434
Total fixed maturity securities, Cost or Amortized Cost	1,728,217
Fair Value
One year or less	65,352
After one year through five years	414,082
After five years through ten years	289,925
After ten years	215,577
Residential mortgage-backed	290,555
Commercial mortgage and asset-backed	322,204
Total investments available-for-sale, Fair Value	$ 1,597,695	$ 1,677,561