Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
OPERATING ACTIVITIES:
Net income	$ 261,117	$ 271,439	$ 259,623
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	20,353	27,287	51,515
Provision for depreciation and amortization	41,944	43,448	46,743
Amortization of investment security premiums, net	30,419	36,238	18,972
Deferred income tax (benefit) expense	9,201	16,234	(2,836)
Investment securities (gains) losses, net	4,425	(4,828)	(10,812)
Net gains on sales of loans held for sale	0	(376)	(2,040)
Proceeds from sales of loans held for sale	0	22,720	87,732
Originations of loans held for sale	0	0	(52,995)
Net (increase) decrease in trading securities	1,358	(9,645)	2,354
Stock-based compensation	6,427	5,001	4,731
(Increase) decrease in interest receivable	3,234	3,149	(2,010)
Decrease in interest payable	(1,569)	(1,272)	(4,598)
Increase (decrease) in income taxes payable	(1,663)	(13,395)	14,519
Net tax benefit related to equity compensation plans	(1,003)	(2,094)	(1,065)
Other changes, net	(13,310)	(10,794)	(2,472)
Net cash provided by operating activities	360,933	383,112	407,361
INVESTING ACTIVITIES
Cash Acquired from Acquisition	47,643	0	0
Proceeds from sales of available for sale securities	16,299	16,875	19,833
Proceeds from maturities/pay downs of available for sale securities	2,542,123	3,080,664	2,562,551
Purchases of available for sale securities	(2,411,153)	(3,182,857)	(4,517,463)
Net (increase) decrease in loans	(938,223)	(693,193)	168,983
Long-term securities purchased under agreements to resell	(125,000)	(575,000)	(500,000)
Repayments of long-term securities purchased under agreements to resell	175,000	225,000	100,000
Purchases of land, buildings and equipment	(23,841)	(34,969)	(21,332)
Sales of land, buildings and equipment	3,492	2,643	2,593
Net cash used in investing activities	(713,660)	(1,160,837)	(2,184,835)
FINANCING ACTIVITIES
Net increase in non-interest bearing, savings, interest checking and money market deposits	801,211	1,777,058	1,981,201
Net decrease in time open and C.D.’s	(82,013)	(257,586)	(255,769)
Repayment of long-term securities sold under agreements to repurchase	(50,000)	0	0
Net increase (decrease) in short-term federal funds purchased and securities sold under agreements to repurchase	313,008	(172,531)	273,254
Repayment of other long-term borrowings	(1,578)	(8,107)	(456)
Increase Short Term Borrowings	2,000	0	0
Purchases of treasury stock	(69,353)	(104,909)	(101,154)
Issuance of stock under stock purchase and equity compensation plans	10,242	15,588	15,349
Net tax benefit related to equity compensation plans	1,003	2,094	1,065
Cash dividends paid on common stock	(82,104)	(211,608)	(79,140)
Net cash provided by (used in) financing activities	842,416	1,039,999	1,834,350
Increase (decrease) in cash and cash equivalents	489,689	262,274	56,876
Cash and cash equivalents at beginning of year	779,825	517,551	460,675
Cash and cash equivalents at end of year	1,269,514	779,825	517,551
Supplemental Cash Flow Information:
Income tax payments, net	114,336	119,166	106,653
Interest paid on deposits and borrowings	32,432	39,335	56,499
Loans transferred to foreclosed real estate	8,747	8,167	22,957
Transfer of Loans Held-for-sale to Portfolio Loans	$ 8,941	$ 0	$ 0