Loans and Leases (Changes In Carrying Value Of Acquired Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended				3 Months Ended
	Sep. 30, 2012 Impaired At Acquisition Date	Sep. 30, 2011 Impaired At Acquisition Date	Sep. 30, 2012 All Other Acquired Loans	Sep. 30, 2011 All Other Acquired Loans	Sep. 30, 2012 Loans on the Cost Recovery Method	Dec. 31, 2011 Loans on the Cost Recovery Method	Sep. 30, 2011 Loans on the Cost Recovery Method
Carrying Value of Acquired Impaired Loans [Roll Forward]
Balance, January 1	$ 458,305	$ 330,705	$ 1,903,847	$ 1,676,747		$ 200,819	$ 298,071
Fair value of acquired loans covered by loss share agreements	0	303,713	0	777,800
Reductions for repayments, foreclosures and changes in carrying value, net of accretion	(167,581)	(134,713)	(297,474)	(396,802)
Balance, September 30	290,724	499,705	1,606,373	2,057,745	66,087	200,819	298,071
Outstanding principal balance at September 30	1,077,975	1,943,770	2,253,660	2,705,324
Reduction in acquired loans					$ 65,615