Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating Activities:
Net income	$ 205,273	$ 175,295
Adjustments to reconcile net income to net cash from operating activities:
Provision for loan losses	11,914	14,683
Deferred tax expense (benefit)	(7,324)	271
Accretion of loan discounts	(10,561)	(9,423)
Securities premium amortization (discount accretion), net	43,965	30,054
Net (gain) loss on securities transactions	(35)	3
Depreciation and amortization	29,593	28,835
Net (gain) loss on sale/write-down of assets/foreclosed assets	863	2,958
Stock-based compensation	6,938	7,310
Net tax benefit (deficiency) from stock-based compensation	24	(396)
Excess tax benefits from stock-based compensation	(2,262)	(2,250)
Earnings on life insurance policies	(2,311)	(2,399)
Net change in:
Trading account securities	710	14,785
Accrued interest receivable and other assets	(43,688)	11,556
Accrued interest payable and other liabilities	(58,261)	(170,982)
Net cash from operating activities	174,838	100,300
Investing Activities:
Securities held to maturity: Purchases	0	(257,571)
Securities held to maturity: Maturities, calls and principal repayments	152,459	13,561
Securities available for sale:
Purchases	(8,799,362)	(9,128,340)
Sales	3,651,982	8,497,061
Maturities, calls and principal repayments	4,396,491	1,192,979
Net change in loans	(557,817)	(102,195)
Net cash (paid) received in acquisitions	830,656	0
Proceeds from sales of premises and equipment	35	16,312
Purchases of premises and equipment	(80,557)	(24,783)
Proceeds from sales of repossessed properties	8,412	6,363
Net cash from investing activities	(397,701)	213,387
Financing Activities:
Net change in deposits	1,177,774	481,528
Net change in short-term borrowings	(137,477)	26,076
Principal payments on long-term borrowings	0	(7)
Proceeds from stock option exercises	25,573	65,026
Excess tax benefits from stock-based compensation	2,262	2,250
Proceeds from issuance of preferred stock	0	144,486
Purchase of treasury stock	0	(144,000)
Cash dividends paid on preferred stock	(6,047)	(4,703)
Cash dividends paid on common stock	(94,894)	(89,261)
Net cash from financing activities	967,191	481,395
Net change in cash and cash equivalents	744,328	795,082
Cash and equivalents at beginning of period	4,556,125	3,524,979
Cash and equivalents at end of period	$ 5,300,453	$ 4,320,061