Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating Activities:
Net income	$ 107,614	$ 100,718
Adjustments to reconcile net income to net cash from operating activities:
Provision for loan losses	18,435	22,221
Deferred tax expense (benefit)	245	(1,406)
Accretion of loan discounts	(5,773)	(5,282)
Securities premium amortization (discount accretion), net	4,905	4,174
Net gain on securities transactions	(5)	(6)
Depreciation and amortization	18,500	18,255
Net (gain) loss on sale of loans held for sale and other assets	2,303	3,221
Stock-based compensation	7,583	7,058
Net tax benefit (deficiency) from stock-based compensation	(89)	(142)
Excess tax benefits from stock-based compensation	(367)	(419)
Earnings on life insurance policies	(1,961)	(2,174)
Net change in:
Trading account securities	584	293
Student loans held for sale		24,029
Accrued interest receivable and other assets	31,745	(21,459)
Accrued interest payable and other liabilities	(18,048)	8,706
Net cash from operating activities	165,671	157,787
Securities held to maturity:
Purchases	(66,688)	(247,148)
Maturities, calls and principal repayments	301	353
Securities available for sale:
Purchases	(6,195,363)	(10,397,173)
Sales	5,548,386	9,997,994
Maturities, calls and principal repayments	458,171	593,434
Net change in loans	19,018	251,432
Net cash paid in acquisitions	(1,044)
Proceeds from sales of premises and equipment	1,131	727
Purchases of premises and equipment	(12,272)	(6,347)
Proceeds from sales of repossessed properties	8,876	15,569
Net cash from investing activities	(239,484)	208,841
Financing Activities:
Net change in deposits	624,789	638,850
Net change in short-term borrowings	98,459	(43,552)
Principal payments on long-term borrowings	(9)	(6,508)
Proceeds from stock option exercises	7,239	23,172
Excess tax benefits from stock-based compensation	367	419
Purchase of treasury stock	(1,657)	(193)
Common stock/treasury stock sold to the 401(k) stock purchase plan		1,728
Cash dividends paid	(55,791)	(53,210)
Net cash from financing activities	673,397	560,706
Net change in cash and cash equivalents	599,584	927,334
Cash and equivalents at beginning of period	2,820,977	1,721,479
Cash and equivalents at end of period	$ 3,420,561	$ 2,648,813