Investments - Available-for-sale Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 4,876
Due after one year through five years	28,396
Due after five years through ten years	23,974
Due after ten years	11,421
Securities with contractual maturities	68,667
Total debt securities	127,119	$ 150,732
Estimated Fair Value
Due in one year or less	4,770
Due after one year through five years	25,963
Due after five years through ten years	19,782
Due after ten years	8,358
Securities with contractual maturities	58,873
Total debt securities	110,201	149,783
Asset-backed securities
Amortized Cost
Total debt securities	21,742	28,652
Estimated Fair Value
Total debt securities	20,496	28,438
Mortgage-backed securities
Amortized Cost
Total debt securities	29,194	33,178
Estimated Fair Value
Total debt securities	24,037	32,521
Commercial mortgage-backed securities
Amortized Cost
Total debt securities	3,414	1,659
Estimated Fair Value
Total debt securities	3,228	1,690
Collateralized mortgage obligations
Amortized Cost
Total debt securities	4,102	5,649
Estimated Fair Value
Total debt securities	$ 3,567	$ 5,639