Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013
OPERATING ACTIVITIES:
Net income	$ 130,021		$ 126,847
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	17,215		10,664
Provision for depreciation and amortization	21,033		20,817
Amortization of investment security premiums, net	8,323		17,227
Investment securities gains (losses), net	(7,479)		3,733
Net decrease in trading securities	16,845		7,465
Stock-based compensation	4,468		2,748
(Increase) decrease in interest receivable	104		116
Increase (decrease) in interest payable	(11)		(238)
Increase (decrease) in income taxes payable	14,719		(6,719)
Net tax benefit related to equity compensation plans	(1,091)		(209)
Other changes, net	4,705		(14,546)
Net cash provided by (used in) operating activities	208,852		167,905
INVESTING ACTIVITIES:
Proceeds from sales of investment securities	63,899	[1]	4,096	[1]
Proceeds from maturities/pay downs of investment securities	928,075	[1]	1,478,237	[1]
Purchases of investment securities	(1,196,956)	[1]	(1,309,380)	[1]
Net (increase) decrease in loans	(520,767)		(555,935)
Long-term securities purchased under agreements to resell	(250,000)		(50,000)
Repayments of long-term securities purchased under agreements to resell	450,000		50,000
Purchases of land, buildings and equipment	(14,583)		(10,713)
Sales of land, buildings and equipment	2,074		715
Net cash provided by (used in) investing activities	(538,258)		(392,980)
FINANCING ACTIVITIES:
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits	(272,723)		(863,336)
Net increase (decrease) in time open and C.D.'s	252,702		281,268
Repayment Of Long Term Securities Sold Under Agreements To Repurchase	(150,000)		0
Net increase in short-term federal funds purchased and securities sold under agreements to repurchase	(42,235)		537,144
Repayment of long-term borrowings	(214)		(943)
Net decrease in other short-term borrowings	(2,000)		0
Proceeds from Issuance of Preferred Stock and Preference Stock	144,816		0
Purchases of treasury stock	(208,989)		(45,292)
Accelerated stock repurchase agreement	(60,000)		0
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options	5,241		6,559
Net tax benefit related to equity compensation plans	1,091		209
Cash dividends paid on common stock	(42,921)		(40,866)
Net cash provided by (used in) financing activities	(375,232)		(125,257)
Increase (decrease) in cash and cash equivalents	(704,638)		(350,332)
Cash and cash equivalents at beginning of year	1,269,514		779,825
Cash and cash equivalents at end of period	564,876		429,493
Supplemental Cash Flow Information:
Income tax payments, net	45,154		65,453
Interest paid on deposits and borrowings	13,942		16,437
Loans transferred to foreclosed real estate	$ 3,769		$ 5,532

[1] Available for sale and non-marketable securities