Investments - Available-for-sale Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Amortized Cost
Due in one year or less	$ 3,955
Due after one year through five years	28,544
Due after five years through ten years	23,584
Due after ten years	12,952
Securities with contractual maturities	69,035
Total debt securities	129,372	$ 150,732
Estimated Fair Value
Due in one year or less	3,886
Due after one year through five years	25,944
Due after five years through ten years	19,261
Due after ten years	9,663
Securities with contractual maturities	58,754
Total debt securities	111,847	149,783
Asset-backed securities
Amortized Cost
Total debt securities	22,896	28,652
Estimated Fair Value
Total debt securities	21,723	28,438
Mortgage-backed securities
Amortized Cost
Total debt securities	29,772	33,178
Estimated Fair Value
Total debt securities	24,330	32,521
Commercial mortgage-backed securities
Amortized Cost
Total debt securities	3,418	1,659
Estimated Fair Value
Total debt securities	3,237	1,690
Collateralized mortgage obligations
Amortized Cost
Total debt securities	4,251	5,649
Estimated Fair Value
Total debt securities	$ 3,803	$ 5,639