Loans and Leases (Changes In Carrying Value Of Acquired Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012 Impaired At Acquisition Date	Jun. 30, 2011 Impaired At Acquisition Date	Jun. 30, 2012 All Other Acquired Loans	Jun. 30, 2011 All Other Acquired Loans	Jun. 30, 2012 Loans on the Cost Recovery Method	Dec. 31, 2011 Loans on the Cost Recovery Method	Jun. 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	$ 166,138	$ 200,819	$ 249,724
Fair value of acquired loans covered by loss share agreements	0	99,344	0	660,007
Reductions for repayments, foreclosures and changes in fair value	(120,657)	(119,650)	(242,144)	(247,415)
Balance, June 30	337,648	310,399	1,661,703	2,089,339	166,138	200,819	249,724
Outstanding principal balance at June 30	$ 1,156,145	$ 1,100,257	$ 2,293,228	$ 2,937,273