Loans (Schedule Of Portfolio By Risk Rating) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Gross loans	$ 6,922,157	$ 6,868,621
Loans held for sale	1,637	2,873
Commercial Loans [Member]
Gross loans	1,637,132	1,441,167
Commercial Loans [Member] | Pass/Watch [Member]
Gross loans	1,488,713	1,258,537
Commercial Loans [Member] | Special Mention [Member]
Gross loans	37,959	58,189
Commercial Loans [Member] | Substandard [Member]
Gross loans	103,507	118,670
Commercial Loans [Member] | Doubtful [Member]
Gross loans	6,953	5,771
Real Estate Construction Loans [Member]
Gross loans	308,939	409,986
Real Estate Construction Loans [Member] | Pass/Watch [Member]
Gross loans	160,603	191,455
Real Estate Construction Loans [Member] | Special Mention [Member]
Gross loans	8,876	53,172
Real Estate Construction Loans [Member] | Substandard [Member]
Gross loans	122,968	153,857
Real Estate Construction Loans [Member] | Doubtful [Member]
Gross loans	16,492	11,502
Commercial Mortgage Loans [Member]
Gross loans	3,804,525	3,940,061
Commercial Mortgage Loans [Member] | Pass/Watch [Member]
Gross loans	3,317,542	3,365,040
Commercial Mortgage Loans [Member] | Special Mention [Member]
Gross loans	85,695	143,974
Commercial Mortgage Loans [Member] | Substandard [Member]
Gross loans	401,288	431,047
Commercial Mortgage Loans [Member] | Doubtful [Member]
Gross loans
Residential Mortgage And Equity Lines [Member]
Gross loans	1,155,444	1,061,330
Residential Mortgage And Equity Lines [Member] | Pass/Watch [Member]
Gross loans	1,117,371	1,026,216
Residential Mortgage And Equity Lines [Member] | Special Mention [Member]
Gross loans	2,418	6,109
Residential Mortgage And Equity Lines [Member] | Substandard [Member]
Gross loans	35,499	28,846
Residential Mortgage And Equity Lines [Member] | Doubtful [Member]
Gross loans	156	159
Installment And Other Loans [Member]
Gross loans	16,117	16,077
Installment And Other Loans [Member] | Pass/Watch [Member]
Gross loans	15,978	15,535
Installment And Other Loans [Member] | Special Mention [Member]
Gross loans	139	542
Installment And Other Loans [Member] | Substandard [Member]
Gross loans
Installment And Other Loans [Member] | Doubtful [Member]
Gross loans
Pass/Watch [Member]
Gross loans	6,100,207	5,856,783
Loans held for sale
Special Mention [Member]
Gross loans	135,087	261,986
Loans held for sale
Substandard [Member]
Gross loans	663,262	732,420
Loans held for sale	1,637	2,873
Doubtful [Member]
Gross loans	23,601	17,432
Loans held for sale