Investments - Schedule of Realized Gains (Losses) on Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]
Sales and other	$ (11,686)	$ 257	$ (23,735)	$ (9,716)
Provision for credit losses	(60)	0	(20)	(16)
Fair value option—change in fair value	5,958	(3,683)	(147)	(22,777)
Mortgage loans	(4,526)	(1,376)	(4,219)	(3,530)
Other investments	(1,131)	(16)	(2,473)	1,135
Realized gains (losses) from investments	(11,445)	(4,818)	(30,594)	(34,904)
Other gains (losses)	6,458	2,626	7,118	8,324
Total realized gains (losses)	(4,987)	(2,192)	(23,476)	(26,580)
Applicable tax	1,048	460	4,930	5,582
Realized gains (losses), net of tax	(3,939)	(1,732)	(18,546)	(20,998)
Exchanges of fixed maturities	176	3,400	128,500	82,200
Exchanges of fixed maturities, realized gains (losses)	$ 176	$ 0	$ (3,000)	$ 0