Fair Value of Financial Instruments - Level 3 Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement Of Income, Extensible List, Not Disclosed Flag	Realized gains (loss) (1)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Change in net unrealized gain (loss) on investments
Recurring
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 10,584	$ 6,476
Realized gains (losses)	0	0
Unrealized gains (losses)	(869)	(715)
Purchases	0	0
Disposals	0	0
Amortization	0	0
Transfers in	0	4,823
Transfers out	(9,715)	0
Ending Balance	0	10,584
Recurring | Corporate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	4,892	5,675
Realized gains (losses)	0	0
Unrealized gains (losses)	0	(783)
Purchases	0	0
Disposals	0	0
Amortization	0	0
Transfers in	0	0
Transfers out	(4,892)	0
Ending Balance	0	4,892
Recurring | Asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	5,692	801
Realized gains (losses)	0	0
Unrealized gains (losses)	(869)	68
Purchases	0	0
Disposals	0	0
Amortization	0	0
Transfers in	0	4,823
Transfers out	(4,823)	0
Ending Balance	$ 0	$ 5,692