Loans and Leases (Changes In Carrying Value Of Acquired Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 Impaired At Acquisition Date [Member]	Mar. 31, 2011 Impaired At Acquisition Date [Member]	Mar. 31, 2012 All Other Acquired Loans [Member]	Mar. 31, 2011 All Other Acquired Loans [Member]	Mar. 31, 2012 Loans on the Cost Recovery Method [Member]	Dec. 31, 2011 Loans on the Cost Recovery Method [Member]	Mar. 31, 2011 Loans on the Cost Recovery Method [Member]
Balance, January 1	$ 458,305	$ 330,705	$ 1,903,847	$ 1,676,747	$ 171,951	$ 200,819	$ 202,873
Fair value of acquired loans covered by loss share agreements	0	120,670	0	646,489
Reductions for repayments foreclosures and decreases in fair value	(66,364)	(45,595)	(111,919)	(70,882)
Balance, March 31	391,941	405,780	1,791,928	2,252,354	171,951	200,819	202,873
Outstanding principal balance at March 31	$ 1,222,862	$ 1,011,908	$ 2,395,860	$ 2,908,609