Loans And Allowance For Loan Losses (Schedule Of Credit Quality Indicators Of Various Classes Of Loans) (Details) (USD $) In Thousands	Sep. 30, 2011	Jun. 04, 2011	Dec. 31, 2010
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	$ 34,100	$ 536,833	$ 45,300
Pass [Member] | Commercial - Originated [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	2,746,943		2,332,952
Pass [Member] | Commercial - Covered [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	42,890		45,609
Pass [Member] | Commercial - Acquired [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	3,934,980
Pass [Member] | Total Commercial [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	6,724,813		2,378,561
Pass-Watch [Member] | Commercial - Originated [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	114,593		138,839
Pass-Watch [Member] | Commercial - Covered [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	28,043		35,289
Pass-Watch [Member] | Commercial - Acquired [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	41,230
Pass-Watch [Member] | Total Commercial [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	183,866		174,128
Special Mention [Member] | Commercial - Originated [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	27,441		26,216
Special Mention [Member] | Commercial - Covered [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	15,690		21,031
Special Mention [Member] | Commercial - Acquired [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	133,198
Special Mention [Member] | Total Commercial [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	176,329		47,247
Substandard [Member] | Commercial - Originated [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	205,378		265,180
Substandard [Member] | Commercial - Covered [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	134,002		254,033
Substandard [Member] | Commercial - Acquired [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	541,586
Substandard [Member] | Total Commercial [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	880,966		519,213
Doubtful [Member] | Commercial - Originated [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	24,936		10,248
Doubtful [Member] | Commercial - Covered [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	81,335		18,368
Doubtful [Member] | Commercial - Acquired [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	3,002
Doubtful [Member] | Total Commercial [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	109,273		28,616
Loss [Member] | Commercial - Originated [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality
Loss [Member] | Commercial - Covered [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality
Loss [Member] | Commercial - Acquired [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality
Loss [Member] | Total Commercial [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality
Commercial - Originated [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	3,119,291		2,773,435
Commercial - Acquired [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	4,653,996
Commercial - Covered [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	301,960		374,330
Total Commercial [Member]
Mortgage Loans on Real Estate [Line Items]
Loans with Deterioration of Credit Quality	$ 8,075,247		$ 3,147,765