Investments - Available-for-sale Fixed Maturity Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost
Due in one year or less	$ 4,629
Due after one year through five years	30,738
Due after five years through ten years	17,489
Due after ten years	10,687
Securities with contractual maturities	63,543
Total debt securities	134,219	$ 135,370
Estimated Fair Value
Due in one year or less	4,564
Due after one year through five years	28,557
Due after five years through ten years	14,648
Due after ten years	8,136
Securities with contractual maturities	55,905
Total debt securities	120,534	122,113
Asset-backed securities
Amortized Cost
Total debt securities	37,813	38,289
Estimated Fair Value
Total debt securities	37,403	37,752
Mortgage-backed securities
Amortized Cost
Total debt securities	26,320	26,768
Estimated Fair Value
Total debt securities	21,276	22,127
Commercial mortgage-backed securities
Amortized Cost
Total debt securities	3,382	3,404
Estimated Fair Value
Total debt securities	3,240	3,244
Collateralized mortgage obligations
Amortized Cost
Total debt securities	3,161	3,228
Estimated Fair Value
Total debt securities	$ 2,710	$ 2,784