Investments - Amortized Cost, Fair Value and Unrealized Gains and (Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Net Investment Income [Line Items]
Amortized Cost	$ 32,590	$ 188,143
Gross unrealized, gains	386	365
Gross unrealized, losses	(2)	(5,757)
Fair Value	32,974	182,751
Variable Interest Entity, Primary Beneficiary
Net Investment Income [Line Items]
Amortized Cost	174,191
Gross unrealized, gains	1,209
Gross unrealized, losses	(3,256)
Fair Value	172,144
U.S. Treasuries
Net Investment Income [Line Items]
Amortized Cost	9,943	27,489
Gross unrealized, gains	88	34
Gross unrealized, losses	0	(421)
Fair Value	10,031	27,102
U.S. Treasuries | Variable Interest Entity, Primary Beneficiary
Net Investment Income [Line Items]
Amortized Cost	9,480
Gross unrealized, gains	65
Gross unrealized, losses	(227)
Fair Value	9,318
Obligations of states, municipalities and political subdivisions
Net Investment Income [Line Items]
Amortized Cost	3,513	12,602
Gross unrealized, gains	38	26
Gross unrealized, losses	0	(756)
Fair Value	3,551	11,872
Obligations of states, municipalities and political subdivisions | Variable Interest Entity, Primary Beneficiary
Net Investment Income [Line Items]
Amortized Cost	13,653
Gross unrealized, gains	73
Gross unrealized, losses	(471)
Fair Value	13,255
Corporate bonds
Net Investment Income [Line Items]
Amortized Cost	10,950	72,996
Gross unrealized, gains	171	192
Gross unrealized, losses	0	(2,292)
Fair Value	11,121	70,896
Corporate bonds | Variable Interest Entity, Primary Beneficiary
Net Investment Income [Line Items]
Amortized Cost	75,540
Gross unrealized, gains	665
Gross unrealized, losses	(1,227)
Fair Value	74,978
Residential and commercial mortgage-backed securities
Net Investment Income [Line Items]
Amortized Cost	8,184	62,721
Gross unrealized, gains	89	85
Gross unrealized, losses	(2)	(2,032)
Fair Value	8,271	60,774
Residential and commercial mortgage-backed securities | Variable Interest Entity, Primary Beneficiary
Net Investment Income [Line Items]
Amortized Cost	60,469
Gross unrealized, gains	301
Gross unrealized, losses	(1,164)
Fair Value	59,606
Other loan-backed and structured securities
Net Investment Income [Line Items]
Amortized Cost	0	12,335
Gross unrealized, gains	0	28
Gross unrealized, losses	0	(256)
Fair Value	0	$ 12,107
Other loan-backed and structured securities | Variable Interest Entity, Primary Beneficiary
Net Investment Income [Line Items]
Amortized Cost	15,049
Gross unrealized, gains	105
Gross unrealized, losses	(167)
Fair Value	$ 14,987