Income Taxes (Schedule Of Tax Effects Of Deferred Tax Assets And Deferred Tax Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Abstract]
Gross deferred tax assets, Book loan loss deduction in excess of tax	$ 315,025	$ 372,206
Gross deferred tax assets, Pension and postretirement	16,380	33,105
Gross deferred tax assets, Deferred compensation	85,846	79,921
Gross deferred tax assets, Other real estate owned	7,099	16,306
Gross deferred tax assets, Security investments and derivative fair value adjustments	155,900	247,770
Gross deferred tax assets, Net operating losses, capital losses and tax credits	6,111	36,600
FDIC Supported Transactions	10,488	0
Gross deferred tax assets, Other	44,450	42,324
Gross deferred tax assets	641,299	828,232
Gross deferred tax assets, Valuation allowance		(4,261)
Total deferred tax assets	637,038	823,971
Gross deferred tax liabilities, Core deposits and purchase accounting	(13,556)	(24,185)
Gross deferred tax liabilities, Premises and equipment, due to differences in depreciation	(13,014)	(16,258)
Gross deferred tax liabilities, FHLB stock dividends	(12,668)	(13,423)
Gross deferred tax liabilities, Leasing operations	(94,637)	(111,265)
Gross deferred tax liabilities, Prepaid expenses	(8,909)	(7,057)
Gross deferred tax liabilities, Prepaid pension reserves	(16,909)	(18,350)
Gross deferred tax liabilities, Subordinated debt modification	(148,820)	(185,733)
Gross deferred tax liabilities, Deferred loan fees	(21,591)	(21,209)
Gross deferred tax liabilities, FDIC-supported transactions	0	(17,957)
Gross deferred tax liabilities, Other	(2,553)	(2,929)
Total deferred tax liabilities	(332,657)	(418,366)
Net deferred tax assets	$ 304,381	$ 405,605