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Investments - Summary of Contractual Maturities of Fixed Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Amortized Cost
Amortized Cost	$ 2,077,885	$ 1,633,814
Fair Value
Fair Value	1,980,439	1,545,587
Total fixed maturities
Amortized Cost
Amortized Cost	1,730,262	1,348,684
Fair Value
Fair Value	1,631,471	$ 1,259,476
Fixed Maturities, Excluding Mortgage-backed and Asset-backed Securities
Amortized Cost
Due less than one year	139,886
Due after one through five years	1,164,512
Due after five through ten years	245,255
Due after ten years	4,714
Fair Value
Due less than one year	135,950
Due after one through five years	1,107,734
Due after five through ten years	230,867
Due after ten years	3,558
Mortgage-backed
Amortized Cost
Mortgage/Asset-backed	163,048
Fair Value
Mortgage/Asset-backed	140,817
Asset-backed
Amortized Cost
Mortgage/Asset-backed	12,847
Fair Value
Mortgage/Asset-backed	$ 12,545

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