Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Activities
Net Income	$ 160,043	$ 183,942	$ 144,033
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Provision for Credit Losses	12,690	55,287	107,878
Depreciation and Amortization	14,624	13,432	13,545
Amortization of Deferred Loan and Lease Fees	(2,709)	(2,804)	(2,405)
Amortization and Accretion of Premiums/Discounts on Investment Securities, Net	49,728	49,834	17,915
Share-Based Compensation	6,216	3,841	3,552
Benefit Plan Contributions	(1,261)	(3,164)	(13,137)
Deferred Income Taxes	198	(18,655)	(41,156)
Net Gain on Sale of Proprietary Mutual Funds	(1,956)	(2,852)
Gains on Sale of Insurance Business		(904)	(2,264)
Net Gains on Sales of Leases	(1,001)	(1,126)	(14,228)
Net Gains on Investment Securities	(6,366)	(42,848)	(25,770)
Net Change in Trading Securities			91,500
Proceeds from Sales of Loans Held for Sale	457,777	685,827	1,075,851
Originations of Loans Held for Sale	(450,635)	(678,135)	(1,030,909)
Tax Benefits from Share-Based Compensation	(884)	(2,983)	(278)
Net Change in Other Assets and Other Liabilities	(6,741)	(32,486)	(35,252)
Net Cash Provided by Operating Activities	229,723	206,206	288,875
Investment Securities Available-for-Sale:
Proceeds from Prepayments and Maturities	1,006,397	1,681,978	1,763,050
Proceeds from Sales	723,556	1,289,681	1,042,766
Purchases	(1,809,249)	(4,145,849)	(5,561,425)
Investment Securities Held-to-Maturity:
Proceeds from Prepayments and Maturities	374,520	53,579	58,245
Purchases	(760,086)
Proceeds from Sale of Proprietary Mutual Funds	1,956	4,424
Proceeds from Sale of Insurance Business		904	6,769
Net Change in Loans and Leases	(235,215)	353,011	688,793
Premises and Equipment, Net	(10,004)	(10,626)	(8,401)
Net Cash Used in Investing Activities	(708,125)	(772,898)	(2,010,203)
Financing Activities
Net Change in Deposits	703,628	479,319	1,117,578
Net Change in Short-Term Borrowings	20,027	282,257	585,036
Repayments of Long-Term Debt		(50,000)	(145,070)
Tax Benefits from Share-Based Compensation	884	2,983	278
Proceeds from Issuance of Common Stock	12,660	16,417	9,664
Repurchase of Common Stock	(111,544)	(24,981)	(1,337)
Cash Dividends Paid	(84,891)	(86,823)	(86,236)
Net Cash Provided by Financing Activities	540,764	619,172	1,479,913
Net Change in Cash and Cash Equivalents	62,362	52,480	(241,415)
Cash and Cash Equivalents at Beginning of Period	607,547	555,067	796,482
Cash and Cash Equivalents at End of Period	669,909	607,547	555,067
Supplemental Information
Cash Paid for Interest	47,817	58,732	92,272
Cash Paid for Income Taxes	85,144	136,841	91,203
Non-Cash Investing and Financing Activities:
Transfer from Investment Securities Available-For-Sale to Investment Securities Held-To-Maturity	3,167,839
Transfer from Loans to Foreclosed Real Estate	3,089	4,923	3,061
Transfers from Loans to Loans Held for Sale	8,555	8,713	39,946
Replacement of a Leveraged Lease with a Direct Financing Lease			$ 32,437