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Investments - Change in Net Unrealized Gains (Losses) on Available-for-Sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Roll Forward]
Beginning balance	$ 4,996,096	$ 4,632,347
Change in net unrealized investment gains (losses)	58,894	(7,079)
Ending balance	5,119,407	4,713,764
Reclassification adjustments to net investment (gains) losses, tax	(657)	(1,401)
Amounts reclassified from accumulated other comprehensive income (loss)
Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Roll Forward]
Beginning balance	(207,624)	(230,556)
Unrealized gains (losses) on investment securities	71,848	(15,665)
Provision for income taxes	(15,425)	3,314
Change in unrealized gains (losses) on investment securities	56,423	(12,351)
Reclassification adjustments to net investment (gains) losses, net of taxes of $(657) and $(1,401), respectively	2,471	5,272
Change in net unrealized investment gains (losses)	58,894	(7,079)
Ending balance	$ (148,730)	$ (237,635)

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