Consolidated Statements Of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014
OPERATING ACTIVITIES:
Net income		$ 202,550	$ 199,042
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses		19,541	24,867
Provision for depreciation and amortization		32,100	31,561
Amortization of investment security premiums, net		23,249	14,473
Investment securities gains (losses), net	[1]	(7,800)	(10,474)
Net gains on sales of loans held for sale		(2,184)	0
Origination Of Loans Held For Sale		(75,589)	0
Proceeds from sales of loans held for sale		72,973	0
Net (increase) decrease in trading securities		(5,042)	14,555
Stock-based compensation		7,702	6,631
(Increase) decrease in interest receivable		(2,652)	(2,215)
Increase (decrease) in interest payable		(96)	(277)
Increase (decrease) in income taxes payable		16,312	4,880
Net tax benefit related to equity compensation plans		(1,871)	(1,457)
Other changes, net		(365)	4,043
Net cash provided by (used in) operating activities		278,828	285,629
INVESTING ACTIVITIES:
Cash paid in sales of branches		0	(43,827)
Proceeds from sales of investment securities	[1]	684,893	64,041
Proceeds from maturities/pay downs of investment securities(A)	[1]	1,923,785	1,392,422
Purchases of investment securities	[1]	(2,507,803)	(1,314,248)
Net (increase) decrease in loans		(782,559)	(527,528)
Long-term securities purchased under agreements to resell		0	(250,000)
Repayments of long-term securities purchased under agreements to resell		75,000	500,000
Purchases of land, buildings and equipment		(22,718)	(34,205)
Sales of land, buildings and equipment		4,752	2,983
Net cash provided by (used in) investing activities		(624,650)	(210,362)
FINANCING ACTIVITIES:
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits		(319,853)	(470,427)
Net increase (decrease) in time open and C.D.'s		(130,591)	(17,295)
Repayment of long-term securities sold under agreements to repurchase		0	(350,000)
Net increase (decrease) in federal funds purchased and short-term securities sold under agreements to repurchase		330,679	398,602
Repayment of long-term borrowings		(227)	(233)
Net increase (decrease) in other short-term borrowings		0	(2,000)
Proceeds from issuance of preferred stock		0	144,784
Purchases of treasury stock		(9,147)	(69,040)
Accelerated stock repurchase agreement		(100,000)	(200,000)
Issuance of stock under equity compensation plans		1,914	7,203
Net tax benefit related to equity compensation plans		1,871	1,457
Cash dividends paid on common stock		(64,041)	(63,575)
Cash dividends paid on preferred stock		(6,750)	(1,800)
Net cash provided by (used in) financing activities		(296,145)	(622,324)
Increase (decrease) in cash and cash equivalents		(641,967)	(547,057)
Cash and cash equivalents at beginning of year		1,100,717	1,269,514
Cash and cash equivalents at end of period		458,750	722,457
Supplemental Cash Flow Information:
Income tax payments, net		70,860	86,002
Interest paid on deposits and borrowings		20,937	21,278
Loans transferred to foreclosed real estate		2,459	4,421
Settlement of accelerated share repurchase agreement and receipt of treasury stock		$ 60,000	$ 0

[1] Available for sale and non-marketable securities