Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 144,558	$ 152,354
Other comprehensive income (loss), net of tax (Note 15)
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected losses has not been recognized	53,621	(34,487)
Less: Reclassification adjustment for net gains (losses) on investments included in net income
Net realized gains (losses) on disposals and non-credit related impairment losses	(1,856)	(2,910)
Net unrealized gains (losses) on investments	55,477	(31,577)
Other adjustments to comprehensive income (loss), net	45	(68)
Other comprehensive income (loss), net of tax	55,522	(31,645)
Comprehensive income (loss)	$ 200,080	$ 120,709