Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Operating Activities:
Net income	$ 175,295	$ 177,764
Adjustments to reconcile net income to net cash from operating activities:
Provision for loan losses	14,683	5,955
Deferred tax expense (benefit)	271	(5,020)
Accretion of loan discounts	(9,423)	(8,321)
Securities premium amortization (discount accretion), net	30,054	14,952
Net (gain) loss on securities transactions	3	121
Depreciation and amortization	28,835	28,374
Net loss on sale/write-down of assets/foreclosed assets	2,958	4,182
Stock-based compensation	7,310	7,942
Net tax benefit (deficiency) from stock-based compensation	(396)	(535)
Excess tax benefits from stock-based compensation	(2,250)	(110)
Earnings on life insurance policies	(2,399)	(3,042)
Net change in:
Trading account securities	14,785	(1,214)
Accrued interest receivable and other assets	11,556	53,120
Accrued interest payable and other liabilities	(170,982)	(4,945)
Net cash from operating activities	100,300	269,223
Investing Activities:
Securities held to maturity: Purchases	(257,571)	0
Securities held to maturity: Maturities, calls and principal repayments	13,561	766
Securities available for sale:
Purchases	(9,128,340)	(17,484,661)
Sales	8,497,061	15,987,480
Maturities, calls and principal repayments	1,192,979	617,489
Net change in loans	(102,195)	(823,627)
Net cash paid in acquisitions	0	(7,199)
Proceeds from sales of premises and equipment	16,312	3,765
Purchases of premises and equipment	(24,783)	(19,724)
Proceeds from sales of repossessed properties	6,363	10,715
Net cash from investing activities	213,387	(1,714,996)
Financing Activities:
Net change in deposits	481,528	1,488,449
Net change in short-term borrowings	26,076	(120,998)
Principal payments on long-term borrowings	(7)	(14)
Proceeds from stock option exercises	65,026	10,092
Excess tax benefits from stock-based compensation	2,250	110
Proceeds from issuance of preferred stock	144,486	0
Purchase of treasury stock	(144,000)	0
Cash dividends paid on preferred stock	(4,703)	0
Cash dividends paid on common stock	(89,261)	(87,282)
Net cash from financing activities	481,395	1,290,357
Net change in cash and cash equivalents	795,082	(155,416)
Cash and equivalents at beginning of period	3,524,979	2,907,592
Cash and equivalents at end of period	$ 4,320,061	$ 2,752,176