Allowance For Loan Losses (Schedule Of Credit Quality Indicators) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Total	$ 2,903,398	$ 2,862,534
Commercial Industrial Loans And Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,306,855	1,292,921
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	171,362	165,340
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,135,493	1,127,581
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,240,684	1,227,170
Pass [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	161,579	156,664
Pass [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,079,105	1,070,506
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	18,257	25,041
Special Mention [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,236	4,099
Special Mention [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	16,021	20,942
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	47,914	40,672
Substandard [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	7,547	4,539
Substandard [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	40,367	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