Loans (Schedule Of Components Of Loans In Consolidated Balance Sheets) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 7,059,212,000	$ 6,868,621,000
Allowance for loan losses	(206,280,000)	(245,231,000)
Unamortized deferred loan fees	(8,449,000)	(7,621,000)
Total loans and leases, net	6,844,483,000	6,615,769,000
Loans held for sale	760,000	2,873,000
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,868,275,000	1,441,167,000
Real Estate Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	237,372,000	409,986,000
Commercial Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	3,748,897,000	3,940,061,000
Residential Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	972,262,000	852,454,000
Loans held for sale	260,000
Equity Lines [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	214,707,000	208,876,000
Installment And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 17,699,000	$ 16,077,000