Consolidated Statements Of Cash Flows - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019
OPERATING ACTIVITIES:
Net income		$ 88,334	$ 205,354
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses		138,492	24,269
Provision for depreciation and amortization		21,320	20,297
Amortization of investment security premiums, net		25,665	12,825
Investment securities (gains) losses, net	[1]	17,430	1,035
Net gains on sales of loans held for sale		(1,826)	(4,584)
Origination of loans held for sale		(41,167)	(108,306)
Proceeds from sales and repayments of held for sale		43,877	112,390
Net (increase) decrease in trading securities		5,249	3,587
Stock-based compensation		7,466	6,879
(Increase) decrease in interest receivable		(3,672)	876
Increase (decrease) in interest payable		(5,145)	4,421
Increase (decrease) in income taxes payable		12,842	23,590
Other changes, net		(79,137)	(50,899)
Net cash provided by (used in) operating activities		229,728	251,734
INVESTING ACTIVITIES:
Proceeds from sales of investment securities (A)	[1]	174,597	375,462
Proceeds from maturities/pay downs of investment securities (A)	[1]	1,224,190	611,223
Purchases of investment securities	[1]	(2,648,074)	(972,274)
Net (increase) decrease in loans		(1,676,552)	(143,629)
Purchases of land, buildings and equipment		(13,677)	(20,289)
Sales of land, buildings and equipment		21	1,477
Net cash provided by (used in) investing activities		(2,939,495)	(148,030)
FINANCING ACTIVITIES:
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits		3,824,235	(1,080,769)
Net increase in certificates of deposit		25,701	443,799
Net increase (decrease) in federal funds purchased and securities sold under agreements to repurchase		(110,334)	437,905
Repayment of long-term borrowings		0	(108)
Net Increase (Decrease) in Short-Term Borrowings		(943)	(4,194)
Purchases of treasury stock		(53,593)	(86,079)
Issuance of stock under equity compensation plans		(27)	(3)
Cash dividends paid on common stock		(60,466)	(57,540)
Cash dividends paid on preferred stock		(4,500)	(4,500)
Net cash provided by (used in) financing activities		3,620,073	(351,489)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease)		910,306	(247,785)
Cash, cash equivalents and restricted cash at beginning of year		907,808	1,209,240
Cash, cash equivalents and restricted cash at June 30		1,818,114	961,455
Supplemental Cash Flow Information:
Income tax payments, net		4,833	26,042
Interest paid on deposits and borrowings		35,832	46,734
Loans transferred to foreclosed real estate		$ 57	$ 558

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