Loans (Schedule Of Average Balance And Interest Income Recognized Related To Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Financing Receivable, Impaired [Line Items]
Impaired Loans, Average Recorded Investment	$ 361,353	$ 370,638
Impaired Loans, Interest Income Recognized	5,330	9,989
Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Average Recorded Investment	48,349	34,857
Impaired Loans, Interest Income Recognized	1,053	1,059
Real Estate Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Average Recorded Investment	82,529	92,859
Impaired Loans, Interest Income Recognized	940	1,665
Commercial Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Average Recorded Investment	212,555	230,952
Impaired Loans, Interest Income Recognized	3,101	6,925
Residential Mortgage And Equity Lines [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Average Recorded Investment	17,920	11,970
Impaired Loans, Interest Income Recognized	$ 236	$ 340