Investments - Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Amortized Cost
Due in one year or less	$ 4,407
Due after one year through five years	18,263
Due after five years through ten years	4,345
Due after ten years	0
Amortized Cost	30,360	$ 188,143
Fair Value
Due in one year or less	4,415
Due after one year through five years	18,492
Due after five years through ten years	4,418
Due after ten years	0
Fair Value	30,725	182,751
Variable Interest Entity, Primary Beneficiary
Amortized Cost
Due in one year or less	2,405
Due after one year through five years	32,653
Due after five years through ten years	46,346
Due after ten years	17,771
Amortized Cost	174,054
Fair Value
Due in one year or less	2,338
Due after one year through five years	32,057
Due after five years through ten years	45,338
Due after ten years	17,495
Fair Value	170,924
Residential and commercial mortgage-backed securities
Amortized Cost
Without single maturity date	3,345
Amortized Cost	3,346	62,721
Fair Value
Without single maturity date	3,400
Fair Value	3,400	60,774
Residential and commercial mortgage-backed securities | Variable Interest Entity, Primary Beneficiary
Amortized Cost
Without single maturity date	62,340
Amortized Cost	62,340
Fair Value
Without single maturity date	61,301
Fair Value	61,301
Other loan-backed and structured securities
Amortized Cost
Without single maturity date	0
Amortized Cost	0	12,335
Fair Value
Without single maturity date	0
Fair Value	0	$ 12,107
Other loan-backed and structured securities | Variable Interest Entity, Primary Beneficiary
Amortized Cost
Without single maturity date	12,539
Amortized Cost	12,539
Fair Value
Without single maturity date	12,395
Fair Value	$ 12,395