Consolidated Statements Of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
OPERATING ACTIVITIES:
Net income		$ 500,020	$ 540,590	$ 353,885
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses		28,071	(66,326)	137,190
Provision for depreciation and amortization		46,856	44,866	43,769
Amortization of investment security premiums, net		18,805	66,934	59,863
Deferred income tax (benefit) expense		21,716	25,613	(19,540)
Investment securities (gains) losses, net	[1]	(20,506)	(30,059)	(11,032)
Net gains on sales of loans held for sale		(2,660)	(22,641)	(16,406)
Proceeds from sales of loans held for sale		123,656	576,864	297,267
Origination Of Loans Held For Sale		(118,850)	(524,597)	(313,329)
Net (increase) decrease in trading securities		4,152	(29,885)	(770)
Purchase of interest rate floor		(35,799)	0	0
Stock-based compensation		16,995	15,415	14,915
(Increase) decrease in interest receivable		(28,439)	19,788	(13,399)
Increase (decrease) in interest payable		3,054	(3,179)	(9,444)
Increase (decrease) in income taxes payable		(12,936)	(5,175)	12,345
Proceeds From the Termination of Interest Rate Floors		0	0	156,740
Other changes, net		15,250	(10,486)	(68,062)
Net cash provided by (used in) operating activities		559,385	597,722	623,992
INVESTING ACTIVITIES
Proceeds from Equity Method Investment, Distribution, Return of Capital		400	13,540	0
Proceeds from sales of available for sale securities	[1]	106,971	80,811	602,477
Proceeds from maturities/pay downs of available for sale securities	[1]	2,691,260	3,459,106	2,673,510
Purchases of available for sale securities	[1]	(2,147,862)	(5,947,891)	(6,991,460)
Net (increase) decrease in loans		(1,146,292)	1,134,533	(1,643,775)
Repayments of long-term securities purchased under agreements to resell		(200,000)	(900,000)	0
Proceeds from Securities Purchased under Agreements to Resell		1,000,000	125,000	0
Purchases of land, buildings and equipment		(65,191)	(56,716)	(33,134)
Sales of land, buildings and equipment		2,985	8,859	1,878
Net cash provided by (used in) investing activities		242,271	(2,082,758)	(5,390,504)
FINANCING ACTIVITIES
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits		(3,254,081)	3,291,466	6,316,100
Net increase (decrease) in time open and C.D.’s		(448,511)	(402,077)	(163,321)
Net increase (decrease) in short-term federal funds purchased and securities sold under agreements to repurchase		(181,233)	924,584	247,611
Net Increase (Decrease) in Short-Term Borrowings		(2,888)	11,758	(1,616)
Payments for Repurchase of Redeemable Preferred Stock		0	0	(150,000)
Purchases of treasury stock		(186,622)	(129,361)	(54,163)
Issuance of stock under equity compensation plans		(8)	(15)	(11)
Cash dividends paid on common stock		(127,466)	(122,693)	(120,818)
Cash dividends paid on preferred stock		0	0	(6,750)
Net cash provided by (used in) financing activities		(4,200,809)	3,573,662	6,067,032
Increase (decrease) in cash and cash equivalents		(3,399,153)	2,088,626	1,300,520
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Beginning of Year		4,296,954	2,208,328	907,808
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, End of Year		897,801	4,296,954	2,208,328
Supplemental Cash Flow Information:
Income tax payments, net		116,995	119,665	90,066
Interest paid on deposits and borrowings		53,740	16,045	52,245
Loans transferred to foreclosed real estate		$ 457	$ 182	$ 93

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