Consolidated Statements Of Cash Flows - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014
OPERATING ACTIVITIES:
Net income		$ 137,337	$ 130,021
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses		11,177	17,215
Provision for depreciation and amortization		21,287	21,033
Amortization of investment security premiums, net		17,797	8,323
Investment securities gains (losses), net	[1]	(8,178)	(7,479)
Net gains on sales of loans held for sale		(1,234)	0
Origination Of Loans Held For Sale		(50,143)	0
Proceeds from sales of loans held for sale		43,593	0
Net decrease in trading securities		(1,310)	16,845
Stock-based compensation		5,252	4,468
(Increase) decrease in interest receivable		(618)	104
Increase (decrease) in interest payable		(201)	(11)
Increase (decrease) in income taxes payable		17,622	14,719
Net tax benefit related to equity compensation plans		(1,662)	(1,091)
Other changes, net		2,842	4,705
Net cash provided by (used in) operating activities		193,561	208,852
INVESTING ACTIVITIES:
Proceeds from sales of investment securities	[1]	683,202	63,899
Proceeds from maturities/pay downs of investment securities(A)	[1]	1,323,921	928,075
Purchases of investment securities	[1]	(1,710,977)	(1,196,956)
Net (increase) decrease in loans		(477,902)	(520,767)
Long-term securities purchased under agreements to resell		0	(250,000)
Repayments of long-term securities purchased under agreements to resell		0	450,000
Purchases of land, buildings and equipment		(15,523)	(14,583)
Sales of land, buildings and equipment		3,430	2,074
Net cash provided by (used in) investing activities		(193,849)	(538,258)
FINANCING ACTIVITIES:
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits		34,287	(272,723)
Net increase (decrease) in time open and C.D.'s		(89,049)	252,702
Repayment of long-term securities sold under agreements to repurchase		0	(150,000)
Net increase (decrease) in federal funds purchased and short-term securities sold under agreements to repurchase		(196,475)	(42,235)
Repayment of long-term borrowings		(215)	(214)
Net increase (decrease) in other short-term borrowings		0	(2,000)
Proceeds from issuance of preferred stock		0	144,816
Purchases of treasury stock		(83,575)	(208,989)
Accelerated stock repurchase agreement		(20,000)	(60,000)
Issuance of stock under equity compensation plans		1,890	5,241
Net tax benefit related to equity compensation plans		1,662	1,091
Cash dividends paid on common stock		(43,105)	(42,921)
Cash dividends paid on preferred stock		(4,500)	0
Net cash provided by (used in) financing activities		(399,080)	(375,232)
Increase (decrease) in cash and cash equivalents		(399,368)	(704,638)
Cash and cash equivalents at beginning of year		1,100,717	1,269,514
Cash and cash equivalents at end of period		701,349	564,876
Supplemental Cash Flow Information:
Income tax payments, net		42,077	45,154
Interest paid on deposits and borrowings		13,964	13,942
Loans transferred to foreclosed real estate		2,133	3,769
Accelerated Share Repurchases, Settlement (Payment) or Receipt		$ 60,000	$ 0

[1] Available for sale and non-marketable securities