Consolidated Statements Of Cash Flows (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Operating Activities:
Net income	$ 162,121	$ 155,713
Adjustments to reconcile net income to net cash from operating activities:
Provision for loan losses	27,445	32,321
Deferred tax expense (benefit)	(137)	(878)
Accretion of loan discounts	(9,865)	(7,889)
Securities premium amortization (discount accretion), net	7,590	5,974
Net gain on securities transactions	(6,414)	(6)
Depreciation and amortization	28,082	27,929
Net (gain) loss on sale of loans held for sale and other assets	4,240	4,495
Stock-based compensation	10,016	10,480
Net tax benefit (deficiency) from stock-based compensation	(89)	(149)
Excess tax benefits from stock-based compensation	(393)	(613)
Earnings on life insurance policies	(2,977)	(3,353)
Net change in:
Trading account securities	(722)	1,192
Student loans held for sale		24,029
Accrued interest receivable and other assets	41,588	(2,464)
Accrued interest payable and other liabilities	(1,145)	35,925
Net cash from operating activities	259,340	282,706
Securities held to maturity:
Purchases	(83,184)	(250,981)
Maturities, calls and principal repayments	464	541
Securities available for sale:
Purchases	(6,195,375)	(11,004,691)
Sales	5,587,391	9,997,994
Maturities, calls and principal repayments	587,650	743,257
Net change in loans	(17,748)	255,555
Net cash paid in acquisitions	(1,044)
Proceeds from sales of premises and equipment	1,256	905
Purchases of premises and equipment	(23,266)	(9,366)
Proceeds from sales of repossessed properties	11,825	17,896
Net cash from investing activities	(132,031)	(248,890)
Financing Activities:
Net change in deposits	1,584,531	1,216,777
Net change in short-term borrowings	182,573	(51,311)
Principal payments on long-term borrowings	(150,014)	(18,885)
Proceeds from stock option exercises	7,239	28,530
Excess tax benefits from stock-based compensation	393	613
Purchase of treasury stock	(1,657)	(193)
Common stock/treasury stock sold to the 401(k) stock purchase plan		2,626
Cash dividends paid	(83,990)	(80,568)
Net cash from financing activities	1,539,075	1,097,589
Net change in cash and cash equivalents	1,666,384	1,131,405
Cash and equivalents at beginning of period	2,820,977	1,721,479
Cash and equivalents at end of period	$ 4,487,361	$ 2,852,884