Allowance For Loan Losses (Schedule Of Credit Quality Indicators) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Total	$ 2,497,023	$ 2,146,369
Commercial, Industrial, And Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,151,130	930,709
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	149,677	108,739
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,001,453	821,970
Pass [Member] | Commercial, Industrial, And Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,048,206	877,307
Pass [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	136,926	105,690
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	911,280	771,617
Special Mention [Member] | Commercial, Industrial, And Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	39,420	15,893
Special Mention [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	4,866	878
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	34,554	15,015
Substandard [Member] | Commercial, Industrial, And Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	60,625	37,509
Substandard [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	7,330	2,171
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	53,295	35,338
Doubtful [Member] | Commercial, Industrial, And Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,879
Doubtful [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	555
Doubtful [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 2,324