Investments - Securities With Gross Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Net Investment Income [Line Items]
Less than twelve months, gross unrealized loss	$ 0	$ (5,011)
Less than twelve months, fair value	1,850	119,225
Twelve months or greater, gross unrealized loss	0	(746)
Twelve months or greater, fair value	0	7,540
Gross Unrealized Loss	0	(5,757)
Fair Value	1,850	126,765
Variable Interest Entity, Primary Beneficiary
Net Investment Income [Line Items]
Less than twelve months, gross unrealized loss	(3,184)
Less than twelve months, fair value	85,809
Twelve months or greater, gross unrealized loss	(607)
Twelve months or greater, fair value	6,462
Gross Unrealized Loss	(3,791)
Fair Value	92,271
U.S. Treasuries
Net Investment Income [Line Items]
Less than twelve months, gross unrealized loss	0	(376)
Less than twelve months, fair value	1,505	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	1,505	8,406
U.S. Treasuries | Variable Interest Entity, Primary Beneficiary
Net Investment Income [Line Items]
Less than twelve months, gross unrealized loss	(224)
Less than twelve months, fair value	4,387
Twelve months or greater, gross unrealized loss	(40)
Twelve months or greater, fair value	290
Gross Unrealized Loss	(264)
Fair Value	4,677
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	(468)
Less than twelve months, fair value	6,290
Twelve months or greater, gross unrealized loss	(91)
Twelve months or greater, fair value	1,137
Gross Unrealized Loss	(559)
Fair Value	7,427
Corporate bonds
Net Investment Income [Line Items]
Less than twelve months, gross unrealized loss	0	(2,063)
Less than twelve months, fair value	299	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	299	50,145
Corporate bonds | Variable Interest Entity, Primary Beneficiary
Net Investment Income [Line Items]
Less than twelve months, gross unrealized loss	(1,386)
Less than twelve months, fair value	33,749
Twelve months or greater, gross unrealized loss	(169)
Twelve months or greater, fair value	2,570
Gross Unrealized Loss	(1,555)
Fair Value	36,319
Residential and commercial mortgage-backed securities
Net Investment Income [Line Items]
Less than twelve months, gross unrealized loss	0	(1,671)
Less than twelve months, fair value	46	49,585
Twelve months or greater, gross unrealized loss	0	(361)
Twelve months or greater, fair value	0	2,691
Gross Unrealized Loss	0	(2,032)
Fair Value	46	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	(922)
Less than twelve months, fair value	36,968
Twelve months or greater, gross unrealized loss	(301)
Twelve months or greater, fair value	2,417
Gross Unrealized Loss	(1,223)
Fair Value	39,385
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	(184)
Less than twelve months, fair value	4,415
Twelve months or greater, gross unrealized loss	(6)
Twelve months or greater, fair value	48
Gross Unrealized Loss	(190)
Fair Value	$ 4,463