STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 124,552	$ 86,241
Other comprehensive (loss) income, net of tax
Change in unrealized holding (losses) gains on available-for-sale securities	(754)	10,494
Amortization of prior service costs and net actuarial gain on pension and other postretirement plans	(1,076)	(2,742)
Total other comprehensive (loss) income, net of tax	(1,830)	7,752
Comprehensive income	$ 122,722	$ 93,993