Consolidated Statements of Cash Flows (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Operating Activities
Net Income	$ 120,814,000	$ 143,364,000
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Provision for Credit Losses	10,471,000	50,009,000
Depreciation and Amortization	10,918,000	10,008,000
Amortization of Deferred Loan and Lease Fees	(1,986,000)	(2,019,000)
Amortization and Accretion of Premiums/Discounts on Investment Securities, Net	39,455,000	31,474,000
Share-Based Compensation	2,001,000	2,703,000
Benefit Plan Contributions	(965,000)	(2,559,000)
Deferred Income Taxes	(8,277,000)	(15,193,000)
Net Gain on Sale of Proprietary Mutual Funds	(1,956,000)	(2,852,000)
Gains on Sale of Insurance Business		(904,000)
Net Gains on Sales of Leases	(795,000)	(292,000)
Net Gains on Investment Securities	(6,084,000)	(42,849,000)
Proceeds from Sales of Loans Held for Sale	334,883,000	418,650,000
Originations of Loans Held for Sale	(321,509,000)	(412,158,000)
Tax Benefits from Share-Based Compensation	(696,000)	(2,725,000)
Net Change in Other Assets and Other Liabilities	6,214,000	(19,707,000)
Net Cash Provided by Operating Activities	182,488,000	154,950,000
Investment Securities Available-for-Sale:
Proceeds from Prepayments and Maturities	730,294,000	1,047,571,000
Proceeds from Sales	682,283,000	1,289,679,000
Purchases	(1,535,348,000)	(3,109,587,000)
Investment Securities Held-to-Maturity:
Proceeds from Prepayments and Maturities	199,844,000	39,685,000
Purchases	(384,785,000)
Proceeds from Sale of Proprietary Mutual Funds	1,956,000	4,424,000
Proceeds from Sale of Insurance Business		904,000
Net Change in Loans and Leases	(37,522,000)	390,512,000
Premises and Equipment, Net	(7,257,000)	(7,887,000)
Net Cash Used in Investing Activities	(350,535,000)	(344,699,000)
Financing Activities
Net Change in Deposits	120,018,000	192,786,000
Net Change in Short-Term Borrowings	28,786,000	(1,330,000)
Repayments of Long-Term Debt		(50,000,000)
Tax Benefits from Share-Based Compensation	696,000	2,725,000
Proceeds from Issuance of Common Stock	9,919,000	13,250,000
Repurchase of Common Stock	(82,391,000)	(13,089,000)
Cash Dividends Paid	(64,048,000)	(65,134,000)
Net Cash Provided by Financing Activities	12,980,000	79,208,000
Net Change in Cash and Cash Equivalents	(155,067,000)	(110,541,000)
Cash and Cash Equivalents at Beginning of Period	607,547,000	555,067,000
Cash and Cash Equivalents at End of Period	452,480,000	444,526,000
Supplemental Information
Cash Paid for Interest	35,448,000	45,254,000
Cash Paid for Income Taxes	68,613,000	115,374,000
Non-Cash Investing Activities:
Transfer from Investment Securities Available-For-Sale to Investment Securities Held-To-Maturity	2,220,814,000
Transfer from Loans to Foreclosed Real Estate	2,067,000	3,478,000
Transfers from Loans to Loans Held for Sale	$ 8,555,000	$ 8,713,000