Allowance For Loan Losses (Schedule Of Credit Quality Indicators) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Total	$ 2,957,912	$ 2,862,534
Commercial Industrial Loans And Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,334,475	1,292,921
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	176,387	165,340
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,158,088	1,127,581
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,272,722	1,227,170
Pass [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	167,493	156,664
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,105,229	1,070,506
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	16,978	25,041
Special Mention [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,027	4,099
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	14,951	20,942
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	44,775	40,672
Substandard [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	6,867	4,539
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	37,908	36,133
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	38
Doubtful [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	38
Doubtful [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 0	$ 0