Investments - Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Amortized Cost
Due in one year or less	$ 3,098
Due after one year through five years	16,138
Due after five years through ten years	5,170
Due after ten years	0
Amortized Cost	32,590	$ 188,143
Fair Value
Due in one year or less	3,104
Due after one year through five years	16,348
Due after five years through ten years	5,251
Due after ten years	0
Fair Value	32,974	182,751
Variable Interest Entity, Primary Beneficiary
Amortized Cost
Due in one year or less	2,396
Due after one year through five years	37,509
Due after five years through ten years	36,610
Due after ten years	22,158
Amortized Cost	174,191
Fair Value
Due in one year or less	2,333
Due after one year through five years	37,090
Due after five years through ten years	36,152
Due after ten years	21,976
Fair Value	172,144
Residential and commercial mortgage-backed securities
Amortized Cost
Without single maturity date	8,184
Amortized Cost	8,184	62,721
Fair Value
Without single maturity date	8,271
Fair Value	8,271	60,774
Residential and commercial mortgage-backed securities | Variable Interest Entity, Primary Beneficiary
Amortized Cost
Without single maturity date	60,469
Amortized Cost	60,469
Fair Value
Without single maturity date	59,606
Fair Value	59,606
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	15,049
Amortized Cost	15,049
Fair Value
Without single maturity date	14,987
Fair Value	$ 14,987