Consolidated Statements Of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019
OPERATING ACTIVITIES:
Net income		$ 221,689	$ 315,434
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses		141,593	35,232
Provision for depreciation and amortization		32,462	30,729
Amortization of investment security premiums, net		37,623	20,436
Investment securities (gains) losses, net	[1]	1,275	(3,874)
Net gains on sales of loans held for sale		(8,267)	(7,881)
Origination of loans held for sale		(169,774)	(187,792)
Proceeds from sales and repayments of held for sale		152,825	194,344
Net (increase) decrease in trading securities		5,636	(428)
Stock-based compensation		11,231	10,365
(Increase) decrease in interest receivable		(11,012)	229
Increase (decrease) in interest payable		(7,670)	5,938
Increase (decrease) in income taxes payable		(7,942)	23,530
Other changes, net		72,714	(58,928)
Net cash provided by (used in) operating activities		472,383	377,334
INVESTING ACTIVITIES:
Proceeds from sales of investment securities (A)	[1]	574,376	379,641
Proceeds from maturities/pay downs of investment securities (A)	[1]	1,856,780	1,007,553
Purchases of investment securities	[1]	(5,135,211)	(1,306,607)
Net (increase) decrease in loans		(1,710,009)	(357,438)
Payments for Securities Purchased under Agreements to Resell		0	(150,000)
Purchases of land, buildings and equipment		(29,192)	(29,441)
Sales of land, buildings and equipment		313	2,029
Net cash provided by (used in) investing activities		(4,442,943)	(454,263)
FINANCING ACTIVITIES:
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits		5,138,314	(230,229)
Net increase (decrease) in certificates of deposit		(17,565)	411,098
Net decrease in federal funds purchased and securities sold under agreements to repurchase		(197,708)	(315,115)
Repayment of long-term borrowings		0	(163)
Net increase (decrease) in short-term borrowings		(1,636)	248,734
Payments for Repurchase of Redeemable Preferred Stock		(150,000)	0
Purchases of treasury stock		(53,760)	(119,970)
Accelerated stock repurchase agreement		0	(150,000)
Issuance of stock under equity compensation plans		(27)	(3)
Cash dividends paid on common stock		(90,640)	(85,533)
Cash dividends paid on preferred stock		(6,750)	(6,750)
Net cash provided by (used in) financing activities		4,620,228	(247,931)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease)		649,668	(324,860)
Cash, cash equivalents and restricted cash at beginning of year		907,808	1,209,240
Cash, cash equivalents and restricted cash at September 30		1,557,476	884,380
Supplemental Cash Flow Information:
Income tax payments, net		58,750	54,161
Interest paid on deposits and borrowings		45,508	73,448
Loans transferred to foreclosed real estate		$ 57	$ 558

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