Loans And Leases (Loans And Leases Outstanding) (Details) (USD $) In Thousands	Sep. 30, 2011		Dec. 31, 2010		Sep. 30, 2010
Total covered loans acquired	$ 2,557,450	[1]	$ 2,007,452	[2]	$ 2,222,660	[1]
Noncovered loans	11,603,526	[1]	11,480,577	[2]	11,545,309	[1]
Total loans and leases	14,160,976		13,488,029		13,767,969
Noncovered loans pledged to secure debt obligations	2,346,113		3,744,067		3,697,003
Commercial Loans [Member]
Total covered loans acquired	2,013,636		1,802,132		1,987,592
Noncovered loans	7,817,695		7,579,295		7,540,043
Commercial Loans [Member] | Construction And Land Development [Member]
Total covered loans acquired	405,658		368,420		448,799
Noncovered loans	416,719		338,929		433,954
Commercial Loans [Member] | Commercial Mortgage [Member]
Total covered loans acquired	1,310,083		1,089,064		1,131,183
Noncovered loans	4,996,036		4,737,862		4,696,183
Commercial Loans [Member] | Other Commercial Real Estate [Member]
Total covered loans acquired	159,007		210,661		220,024
Noncovered loans	144,538		149,710		155,509
Commercial Loans [Member] | Commercial And Industrial [Member]
Total covered loans acquired	137,253		132,477		182,905
Noncovered loans	1,797,581		1,869,490		1,774,340
Commercial Loans [Member] | Lease Financing [Member]
Total covered loans acquired	162		0		0
Noncovered loans	304,039		301,289		294,825
Commercial Loans [Member] | Other Loans [Member]
Total covered loans acquired	1,473		1,510		4,681
Noncovered loans	158,782		182,015		185,232
Non-Commercial Loans [Member]
Total covered loans acquired	543,814		205,320		235,068
Noncovered loans	3,785,831		3,901,282		4,005,266
Non-Commercial Loans [Member] | Construction And Land Development [Member]
Total covered loans acquired	115,126		105,805		122,192
Noncovered loans	139,185		192,954		112,116
Non-Commercial Loans [Member] | Residential Mortgage [Member]
Total covered loans acquired	380,405		74,495		82,769
Noncovered loans	816,738		878,792		917,415
Non-Commercial Loans [Member] | Revolving Mortgage [Member]
Total covered loans acquired	39,709		17,866		23,139
Noncovered loans	2,302,482		2,233,853		2,209,149
Non-Commercial Loans [Member] | Consumer [Member]
Total covered loans acquired	8,574		7,154		6,968
Noncovered loans	$ 527,426		$ 595,683		$ 766,586

[1] Unaudited

[2] Derived from 2010 Annual Report on Form 10-K.