Parent Company Condensed Financial Statements - Schedule of Condensed Statement of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of income
Compensation and employee benefits	$ 550,734	$ 508,538	$ 477,635
Other expense (income)	148,301	140,222	118,166
Income tax benefit	(316,275)	(298,609)	(283,571)
NET INCOME	1,165,586	1,161,161	1,128,083
Parent Company
Statement of income
Other investment losses	(954)	(2,738)	0
Other income	31	0	0
Total income	539,204	701,584	240,157
Interest expense on long-term debt	4,507	10,889	5,450
Compensation and employee benefits	7,283	7,204	6,708
Other expense (income)	1,839	(1,086)	1,254
Total expense	13,629	17,007	13,412
Income before income tax benefit and equity in undistributed income of subsidiaries	525,575	684,577	226,745
Income tax benefit	4,143	5,844	4,269
Undistributed earnings of subsidiaries, primarily bank	635,868	470,740	897,069
NET INCOME	1,165,586	1,161,161	1,128,083
Other noninterest recovery		3,000	2,000
Parent Company | Bank
Statement of income
Dividends from subsidiaries	540,000	704,000	240,000
Parent Company | Nonbank
Statement of income
Dividends from subsidiaries	$ 127	$ 322	$ 157