Investments - Schedule of Amortized Cost and Fair Value of Mortgage-backed Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost
Due after one year through five years	$ 455
Due after five years through ten years	1,199
Due after ten years	4,730
Agency mortgage-backed securities	3,061
Amortized Cost	9,445	$ 9,539
Fair Value
Due after one year through five years	453
Due after five years through ten years	1,210
Due after ten years	3,779
Agency mortgage-backed securities	2,673
Estimated Fair Value	8,115	8,287
Amortized Cost
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	704
Agency mortgage-backed securities	1,453
Total	2,157	2,166
Fair Value
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	522
Agency mortgage-backed securities	1,208
Total	$ 1,730	$ 1,787