Consolidated Statements Of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
OPERATING ACTIVITIES:
Net income		$ 485,177	$ 500,020	$ 540,590
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses		35,451	28,071	(66,326)
Provision for depreciation and amortization		49,513	46,856	44,866
Amortization of investment security premiums, net		17,666	18,805	66,934
Deferred income tax (benefit) expense		(7,399)	21,716	25,613
Investment securities (gains) losses, net	[1]	(14,985)	(20,506)	(30,059)
Net gains on sales of loans held for sale		(1,026)	(2,660)	(22,641)
Proceeds from sales of loans held for sale		58,946	123,656	576,864
Origination Of Loans Held For Sale		(57,424)	(118,850)	(524,597)
Net (increase) decrease in trading securities		28,478	4,152	(29,885)
Purchase of interest rate floor		(54,449)	(35,799)	0
Stock-based compensation		17,052	16,995	15,415
(Increase) decrease in interest receivable		(5,986)	(28,439)	19,788
Increase (decrease) in interest payable		46,650	3,054	(3,179)
Increase (decrease) in income taxes payable		4,586	(12,936)	(5,175)
Other changes, net		(113,481)	15,250	(10,486)
Net cash provided by (used in) operating activities		488,769	559,385	597,722
INVESTING ACTIVITIES
Payments to Acquire Businesses, Net of Cash Acquired		(6,365)	0	0
Proceeds from Equity Method Investment, Distribution, Return of Capital		1,434	400	13,540
Proceeds from sales of investment securities	[1]	1,141,949	106,971	80,811
Proceeds from maturities/pay downs of investment securities	[1]	1,935,552	2,691,260	3,459,106
Purchases of investment securities	[1]	(246,286)	(2,147,862)	(5,947,891)
Net (increase) decrease in loans		(933,736)	(1,146,292)	1,134,533
Securities purchased under agreements to resell		0	(200,000)	(900,000)
Repayments of securities purchased under agreements to resell		375,000	1,000,000	125,000
Purchases of land, buildings and equipment		(88,074)	(65,191)	(56,716)
Sales of land, buildings and equipment		4,358	2,985	8,859
Net cash provided by (used in) investing activities		2,183,832	242,271	(2,082,758)
FINANCING ACTIVITIES
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits		(2,612,412)	(3,254,081)	3,291,466
Net increase (decrease) in time open and C.D.’s		1,881,587	(448,511)	(402,077)
Net increase (decrease) in short-term federal funds purchased and securities sold under agreements to repurchase		67,081	(181,233)	924,584
FHLB short-term borrowings		2,250,000	0	0
Repayments of FHLB borrowings		(2,250,000)	0	0
Net increase (decrease) in other borrowings		(8,268)	(2,888)	11,758
Purchases of treasury stock		(76,370)	(186,622)	(129,361)
Cash dividends paid on common stock		(134,734)	(127,466)	(122,693)
Other, net		(3)	(8)	(15)
Net cash provided by (used in) financing activities		(883,119)	(4,200,809)	3,573,662
Increase (decrease) in cash and cash equivalents		1,789,482	(3,399,153)	2,088,626
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning of Year		897,801	4,296,954	2,208,328
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, End of Year		2,687,283	897,801	4,296,954
Supplemental Cash Flow Information:
Income tax payments, net		130,957	116,995	119,665
Interest paid on deposits and borrowings		336,512	53,740	16,045
Loans transferred to foreclosed real estate		$ 322	$ 457	$ 182

[1] Available for sale debt securities, equity securities, and other securities.