Loans (Schedule Of Portfolio By Risk Rating) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 7,059,212	$ 6,868,621
Loans held for sale	760	2,873
Pass/Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	6,247,672	5,856,783
Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	162,272	261,986
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	635,691	732,420
Loans held for sale	260	2,873
Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	13,577	17,432
Loans held for sale	500
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,868,275	1,441,167
Commercial Loans [Member] | Pass/Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,689,842	1,258,537
Commercial Loans [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	64,290	58,189
Commercial Loans [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	108,858	118,670
Commercial Loans [Member] | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	5,285	5,771
Real Estate Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	237,372	409,986
Real Estate Construction Loans [Member] | Pass/Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	115,538	191,455
Real Estate Construction Loans [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	23,555	53,172
Real Estate Construction Loans [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	90,132	153,857
Real Estate Construction Loans [Member] | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	8,147	11,502
Commercial Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	3,748,897	3,940,061
Commercial Mortgage Loans [Member] | Pass/Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	3,275,431	3,365,040
Commercial Mortgage Loans [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	69,925	143,974
Commercial Mortgage Loans [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	403,541	431,047
Residential Mortgage And Equity Lines [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,186,969	1,061,330
Residential Mortgage And Equity Lines [Member] | Pass/Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,149,225	1,026,216
Residential Mortgage And Equity Lines [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	4,439	6,109
Residential Mortgage And Equity Lines [Member] | Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	33,160	28,846
Residential Mortgage And Equity Lines [Member] | Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	145	159
Installment And Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	17,699	16,077
Installment And Other Loans [Member] | Pass/Watch [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	17,636	15,535
Installment And Other Loans [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 63	$ 542