Loans Receivable (Schedule Of Loans Receivable) (Details) - New (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Total loans receivable	$ 7,200,646	$ 6,035,332
Commercial Loans [Member]
Total loans receivable	5,161,549	4,162,963
Commercial Loans [Member] | Real Estate [Member]
Total loans receivable	3,398,830	2,647,107
Commercial Loans [Member] | Business [Member]
Total loans receivable	1,762,719	1,515,856
Consumer Loans [Member]
Total loans receivable	1,475,064	1,240,997
Consumer Loans [Member] | Indirect automobile [Member]
Total loans receivable	247,103	255,322
Consumer Loans [Member] | Home equity [Member]
Total loans receivable	1,006,113	834,840
Consumer Loans [Member] | Other Consumer [Member]
Total loans receivable	221,848	150,835
Residential Mortgage Loans [Member]
Total loans receivable	564,033	631,372
Residential Mortgage Loans [Member] | Residential 1-4 Family [Member]
Total loans receivable	546,339	616,550
Residential Mortgage Loans [Member] | Construction/ Owner Occupied [Member]
Total loans receivable	$ 17,694	$ 14,822