Loans (Schedule Of Impaired Loans And Related Allowance And Charge-Off) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Financing Receivable, Impaired [Line Items]
Impaired Loans, Unpaid Principal Balance	$ 419,053	$ 500,722
Impaired Loans, Recorded Investment	320,260	381,992
Impaired Loans, Allowance	7,403	15,185
Commercial Loans [Member] | With No Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Unpaid Principal Balance	36,594	41,233
Impaired Loans, Recorded Investment	26,111	27,775
Commercial Loans [Member] | With Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Unpaid Principal Balance	22,902	13,930
Impaired Loans, Recorded Investment	18,879	7,748
Impaired Loans, Allowance	2,270	2,925
Real Estate Construction Loans [Member] | With No Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Unpaid Principal Balance	125,478	102,186
Impaired Loans, Recorded Investment	82,818	64,274
Real Estate Construction Loans [Member] | With Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Unpaid Principal Balance		15,429
Impaired Loans, Recorded Investment		13,416
Impaired Loans, Allowance		7,470
Commercial Mortgage Loans [Member] | With No Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Unpaid Principal Balance	169,495	211,717
Impaired Loans, Recorded Investment	131,342	156,305
Commercial Mortgage Loans [Member] | With Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Unpaid Principal Balance	44,036	98,593
Impaired Loans, Recorded Investment	42,220	96,449
Impaired Loans, Allowance	3,930	3,812
Residential Mortgage And Equity Lines [Member] | With No Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Unpaid Principal Balance	8,073	7,823
Impaired Loans, Recorded Investment	7,468	7,436
Residential Mortgage And Equity Lines [Member] | With Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Unpaid Principal Balance	12,475	9,811
Impaired Loans, Recorded Investment	11,422	8,589
Impaired Loans, Allowance	1,203	978
With No Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Unpaid Principal Balance	339,640	362,959
Impaired Loans, Recorded Investment	247,739	255,790
With Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Loans, Unpaid Principal Balance	79,413	137,763
Impaired Loans, Recorded Investment	72,521	126,202
Impaired Loans, Allowance	$ 7,403	$ 15,185