Investments - Schedule of Amortized Cost and Fair Value of Mortgage-backed Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Amortized Cost
Due after one year through five years	$ 454
Due after five years through ten years	1,717
Due after ten years	4,152
Agency mortgage-backed securities	2,534
Amortized Cost	8,857	$ 9,112
Estimated Fair Value
Due after one year through five years	455
Due after five years through ten years	1,640
Due after ten years	3,288
Agency mortgage-backed securities	2,254
Estimated Fair Value	7,637	7,790
Amortized Cost
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	703
Agency mortgage-backed securities	1,196
Total	1,899	2,130
Estimated Fair Value
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	533
Agency mortgage-backed securities	1,019
Total	$ 1,552	$ 1,712