Investments - Securities With Gross Unrealized Loss Position (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Net Investment Income [Line Items]
Less than twelve months, gross unrealized loss	$ (2)	$ (5,011)
Less than twelve months, fair value	2,221	119,225
Twelve months or greater, gross unrealized loss	0	(746)
Twelve months or greater, fair value	0	7,540
Gross Unrealized Loss	(2)	(5,757)
Fair Value	2,221	126,765
Variable Interest Entity, Primary Beneficiary
Net Investment Income [Line Items]
Less than twelve months, gross unrealized loss	(2,698)
Less than twelve months, fair value	60,492
Twelve months or greater, gross unrealized loss	(558)
Twelve months or greater, fair value	5,666
Gross Unrealized Loss	(3,256)
Fair Value	66,158
U.S. Treasuries
Net Investment Income [Line Items]
Less than twelve months, gross unrealized loss	0	(376)
Less than twelve months, fair value	1,654	7,881
Twelve months or greater, gross unrealized loss	0	(45)
Twelve months or greater, fair value	0	525
Gross Unrealized Loss	0	(421)
Fair Value	1,654	8,406
U.S. Treasuries | Variable Interest Entity, Primary Beneficiary
Net Investment Income [Line Items]
Less than twelve months, gross unrealized loss	(188)
Less than twelve months, fair value	4,432
Twelve months or greater, gross unrealized loss	(39)
Twelve months or greater, fair value	124
Gross Unrealized Loss	(227)
Fair Value	4,556
Obligations of states, municipalities and political subdivisions
Net Investment Income [Line Items]
Less than twelve months, gross unrealized loss	0	(652)
Less than twelve months, fair value	0	7,738
Twelve months or greater, gross unrealized loss	0	(104)
Twelve months or greater, fair value	0	1,175
Gross Unrealized Loss	0	(756)
Fair Value	0	8,913
Obligations of states, municipalities and political subdivisions | Variable Interest Entity, Primary Beneficiary
Net Investment Income [Line Items]
Less than twelve months, gross unrealized loss	(387)
Less than twelve months, fair value	6,140
Twelve months or greater, gross unrealized loss	(84)
Twelve months or greater, fair value	1,142
Gross Unrealized Loss	(471)
Fair Value	7,282
Corporate bonds
Net Investment Income [Line Items]
Less than twelve months, gross unrealized loss	0	(2,063)
Less than twelve months, fair value	200	47,045
Twelve months or greater, gross unrealized loss	0	(229)
Twelve months or greater, fair value	0	3,100
Gross Unrealized Loss	0	(2,292)
Fair Value	200	50,145
Corporate bonds | Variable Interest Entity, Primary Beneficiary
Net Investment Income [Line Items]
Less than twelve months, gross unrealized loss	(1,083)
Less than twelve months, fair value	17,511
Twelve months or greater, gross unrealized loss	(144)
Twelve months or greater, fair value	2,310
Gross Unrealized Loss	(1,227)
Fair Value	19,821
Residential and commercial mortgage-backed securities
Net Investment Income [Line Items]
Less than twelve months, gross unrealized loss	(2)	(1,671)
Less than twelve months, fair value	367	49,585
Twelve months or greater, gross unrealized loss	0	(361)
Twelve months or greater, fair value	0	2,691
Gross Unrealized Loss	(2)	(2,032)
Fair Value	367	52,276
Residential and commercial mortgage-backed securities | Variable Interest Entity, Primary Beneficiary
Net Investment Income [Line Items]
Less than twelve months, gross unrealized loss	(878)
Less than twelve months, fair value	28,875
Twelve months or greater, gross unrealized loss	(286)
Twelve months or greater, fair value	2,041
Gross Unrealized Loss	(1,164)
Fair Value	30,916
Other loan-backed and structured securities
Net Investment Income [Line Items]
Less than twelve months, gross unrealized loss	0	(249)
Less than twelve months, fair value	0	6,976
Twelve months or greater, gross unrealized loss	0	(7)
Twelve months or greater, fair value	0	49
Gross Unrealized Loss	0	(256)
Fair Value	0	$ 7,025
Other loan-backed and structured securities | Variable Interest Entity, Primary Beneficiary
Net Investment Income [Line Items]
Less than twelve months, gross unrealized loss	(162)
Less than twelve months, fair value	3,534
Twelve months or greater, gross unrealized loss	(5)
Twelve months or greater, fair value	49
Gross Unrealized Loss	(167)
Fair Value	$ 3,583