Consolidated Statements of Cash Flows (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Operating Activities
Net Income	$ 77,508	$ 99,300
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Provision for Credit Losses	8,291	36,650
Depreciation and Amortization	7,076	6,702
Amortization of Deferred Loan and Lease Fees	(1,330)	(1,147)
Amortization and Accretion of Premiums/Discounts on Investment Securities, Net	25,416	17,964
Share-Based Compensation	1,360	1,545
Benefit Plan Contributions	(651)	(2,184)
Deferred Income Taxes	(12,455)	(4,975)
Net Gains on Sales of Leases	(602)	(1,614)
Net Gains on Investment Securities	(6,084)	(34,972)
Proceeds from Sales of Loans Held for Sale	234,984	232,574
Originations of Loans Held for Sale	(222,022)	(220,497)
Tax Benefits from Share-Based Compensation	(633)	(1,585)
Net Change in Other Assets and Other Liabilities	(15,030)	(31,441)
Net Cash Provided by Operating Activities	95,828	96,320
Investment Securities Available-for-Sale:
Proceeds from Prepayments and Maturities	490,602	846,480
Proceeds from Sales	682,283	618,108
Purchases	(982,759)	(2,006,953)
Investment Securities Held-to-Maturity:
Proceeds from Prepayments and Maturities	110,989	27,731
Purchases	(281,936)
Net Change in Loans and Leases	(36,718)	279,973
Premises and Equipment, Net	(4,691)	(4,120)
Net Cash Used in Investing Activities	(22,230)	(238,781)
Financing Activities
Net Change in Deposits	90,039	(85,017)
Net Change in Short-Term Borrowings	(26,794)	463,720
Repayments of Long-Term Debt		(50,000)
Tax Benefits from Share-Based Compensation	633	1,585
Proceeds from Issuance of Common Stock	7,334	7,207
Repurchase of Common Stock	(52,228)	(3,280)
Cash Dividends Paid	(42,965)	(43,354)
Net Cash Provided by (Used in) Financing Activities	(23,981)	290,861
Net Change in Cash and Cash Equivalents	49,617	148,400
Cash and Cash Equivalents at Beginning of Period	607,547	555,067
Cash and Cash Equivalents at End of Period	657,164	703,467
Supplemental Information
Cash Paid for Interest	24,279	33,303
Cash Paid for Income Taxes	48,057	89,949
Non-Cash Investing and Financing Activities:
Reduction In Lease Financing Receivables	2,582
Reduction In Long-Term Non-Recourse Debt	1,920
Transfer from Investment Securities Available-For-Sale to Investment Securities Held-To-Maturity	2,220,814
Transfer from Loans to Foreclosed Real Estate	1,159	60
Transfers from Loans to Loans Held for Sale	$ 8,555	$ 8,713