Consolidated Statements Of Cash Flows - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
OPERATING ACTIVITIES:
Net income		$ 65,522	$ 62,014
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses		9,439	4,420
Provision for depreciation and amortization		10,146	10,694
Amortization of investment security premiums, net		11,188	15,099
Investment securities gains (losses), net	[1]	995	(6,035)
Net gains on sales of loans held for sale		(969)	(467)
Origination Of Loans Held For Sale		(24,009)	(17,806)
Proceeds from sales of loans held for sale		22,666	15,575
Net (increase) decrease in trading securities		76,143	(4,361)
Stock-based compensation		3,411	2,740
(Increase) decrease in interest receivable		(473)	(788)
Increase (decrease) in interest payable		280	27
Increase (decrease) in income taxes payable		26,133	24,904
Net (excess) tax benefit related to equity compensation plans		(1,236)	(857)
Other changes, net		(3,352)	(9,642)
Net cash provided by (used in) operating activities		195,884	95,517
INVESTING ACTIVITIES:
Proceeds from sales of investment securities	[1]	94	185,732
Proceeds from maturities/pay downs of investment securities(A)	[1]	542,059	609,144
Purchases of investment securities	[1]	(180,774)	(1,125,969)
Net (increase) decrease in loans		(320,987)	(260,799)
Repayments of long-term securities purchased under agreements to resell		50,000	0
Purchases of land, buildings and equipment		(7,389)	(8,575)
Sales of land, buildings and equipment		520	3
Net cash provided by (used in) investing activities		83,523	(600,464)
FINANCING ACTIVITIES:
Net increase (decrease) in non-interest bearing, savings, interest checking and money market deposits		421,286	218,837
Net increase (decrease) in time open and C.D.'s		418,177	12,921
Net increase (decrease) in federal funds purchased and short-term securities sold under agreements to repurchase		(1,006,164)	(252,055)
Repayment of long-term borrowings		(12)	(204)
Purchases of treasury stock		(36,432)	(1,718)
Issuance of stock under equity compensation plans		0	1,865
Excess (net) tax benefit related to equity compensation plans		1,236	857
Cash dividends paid on common stock		(21,760)	(21,752)
Cash dividends paid on preferred stock		(2,250)	(2,250)
Net cash provided by (used in) financing activities		(225,919)	(43,499)
Increase (decrease) in cash and cash equivalents		53,488	(548,446)
Cash and cash equivalents at beginning of year		502,719	1,100,717
Cash and cash equivalents at end of period		556,207	552,271
Supplemental Cash Flow Information:
Income tax payments, net		2,658	2,953
Interest paid on deposits and borrowings		8,073	6,817
Loans transferred to foreclosed real estate		471	482
Transfer of loans held for investment to held for sale		$ 50,360	$ 0

[1] Available for sale and non-marketable securities