CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Statement of Comprehensive Income [Abstract]
Net income	$ 278,214	$ 210,440	$ 523,888	$ 387,942
Other comprehensive income before tax:
Foreign currency translation adjustment	22,428	7,499	22,172	854
Amortization of net losses of pension and postretirement benefit plans	2,258	2,272	4,516	4,545
Unrealized holding (losses) gains on debt securities arising during the period	(60,919)	58,972	(94,015)	224,957
Amortization of unrealized losses of debt securities transfer from available-for- sale to held-to-maturity	43,886	46,242	90,762	91,552
Other comprehensive income before tax	7,653	114,985	23,435	321,908
Income tax benefit (expense)	1,649	(20,655)	(734)	(56,325)
Total other comprehensive income, net of tax	9,302	94,330	22,701	265,583
Comprehensive income, net of tax	287,516	304,770	546,589	653,525
Amortization of net losses of pension and postretirement benefit plans	(847)	(852)	(1,694)	(1,704)
Unrealized benefit (expense) due to holding gains or losses on debt securities arising during the period	11,272	(10,555)	19,111	(36,311)
Amortization of unrealized losses of debt securities transfer from available-for- sale to held-to-maturity	(8,776)	(9,248)	(18,151)	(18,310)
Income tax benefit (expense)	$ 1,649	$ (20,655)	$ (734)	$ (56,325)