Loans And Leases (Changes In Carrying Value Of Acquired Impaired Loans) (Details) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Impaired At Acquisition Date [Member]
Balance, January 1	$ 330,705	$ 75,368
Fair value of acquired loans covered by loss share agreements	303,713	412,627
Reductions for repayments foreclosures and decreases in fair value	(134,713)	(87,249)
Balance, September 30	499,705	400,746
Outstanding principal balance at September 30	1,943,770	742,010
All Other Acquired Loans [Member]
Balance, January 1	1,676,747	1,097,652
Fair value of acquired loans covered by loss share agreements	777,800	1,138,513
Reductions for repayments foreclosures and decreases in fair value	(396,802)	(414,251)
Balance, September 30	2,057,745	1,821,914
Outstanding principal balance at September 30	$ 2,705,324	$ 2,535,003