Investments - Available-for-sale Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Amortized Cost
Due in one year or less	$ 3,212
Due after one year through five years	30,996
Due after five years through ten years	18,768
Due after ten years	10,705
Securities with contractual maturities	63,681
Total debt securities	135,370	$ 127,119
Estimated Fair Value
Due in one year or less	3,175
Due after one year through five years	28,983
Due after five years through ten years	15,904
Due after ten years	8,144
Securities with contractual maturities	56,206
Total debt securities	122,113	110,201
Asset-backed securities
Amortized Cost
Total debt securities	38,289	21,742
Estimated Fair Value
Total debt securities	37,752	20,496
Mortgage-backed securities
Amortized Cost
Total debt securities	26,768	29,194
Estimated Fair Value
Total debt securities	22,127	24,037
Commercial mortgage-backed securities
Amortized Cost
Total debt securities	3,404	3,414
Estimated Fair Value
Total debt securities	3,244	3,228
Collateralized mortgage obligations
Amortized Cost
Total debt securities	3,228	4,102
Estimated Fair Value
Total debt securities	$ 2,784	$ 3,567