Loans And Allowance For Loan Losses (Schedule Of Credit Quality Indicators Of Various Classes Of Loans) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Loans with Deterioration of Credit Quality	$ 536,833
Pass [Member] | Commercial - Originated [Member]
Loans with Deterioration of Credit Quality	2,419,097	2,332,952
Pass [Member] | Commercial - Covered [Member]
Loans with Deterioration of Credit Quality	37,910	45,609
Pass [Member] | Commercial - Acquired [Member]
Loans with Deterioration of Credit Quality	4,205,394
Pass [Member] | Total Commercial [Member]
Loans with Deterioration of Credit Quality	6,662,401	2,378,561
Pass-Watch [Member] | Commercial - Originated [Member]
Loans with Deterioration of Credit Quality	102,524	138,839
Pass-Watch [Member] | Commercial - Covered [Member]
Loans with Deterioration of Credit Quality	24,998	35,289
Pass-Watch [Member] | Total Commercial [Member]
Loans with Deterioration of Credit Quality	127,522	174,128
Special Mention [Member] | Commercial - Originated [Member]
Loans with Deterioration of Credit Quality	15,887	26,216
Special Mention [Member] | Commercial - Covered [Member]
Loans with Deterioration of Credit Quality	14,265	21,031
Special Mention [Member] | Commercial - Acquired [Member]
Loans with Deterioration of Credit Quality	145,666
Special Mention [Member] | Total Commercial [Member]
Loans with Deterioration of Credit Quality	175,818	47,247
Substandard [Member] | Commercial - Originated [Member]
Loans with Deterioration of Credit Quality	245,407	265,180
Substandard [Member] | Commercial - Covered [Member]
Loans with Deterioration of Credit Quality	134,788	254,033
Substandard [Member] | Commercial - Acquired [Member]
Loans with Deterioration of Credit Quality	685,878
Substandard [Member] | Total Commercial [Member]
Loans with Deterioration of Credit Quality	1,066,073	519,213
Doubtful [Member] | Commercial - Originated [Member]
Loans with Deterioration of Credit Quality	63,040	10,247
Doubtful [Member] | Commercial - Covered [Member]
Loans with Deterioration of Credit Quality	135,480	18,369
Doubtful [Member] | Commercial - Acquired [Member]
Loans with Deterioration of Credit Quality	3,185
Doubtful [Member] | Total Commercial [Member]
Loans with Deterioration of Credit Quality	201,705	28,616
Loss [Member] | Commercial - Originated [Member]
Loans with Deterioration of Credit Quality
Loss [Member] | Commercial - Covered [Member]
Loans with Deterioration of Credit Quality
Loss [Member] | Commercial - Acquired [Member]
Loans with Deterioration of Credit Quality
Loss [Member] | Total Commercial [Member]
Loans with Deterioration of Credit Quality
Commercial - Originated [Member]
Loans with Deterioration of Credit Quality	2,845,955	2,773,434
Commercial - Acquired [Member]
Loans with Deterioration of Credit Quality	5,040,123
Commercial - Covered [Member]
Loans with Deterioration of Credit Quality	347,441	374,331
Total Commercial [Member]
Loans with Deterioration of Credit Quality	$ 8,233,519	$ 3,147,765