Allowance For Loan Losses (Schedule Of Credit Quality Indicators) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 3,582,571	$ 3,587,608
Commercial Industrial Loans And Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,728,910	1,741,256
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	296,927	286,314
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,431,983	1,454,942
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,637,565	1,653,677
Pass | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	262,591	250,856
Pass | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,374,974	1,402,821
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	16,138	33,582
Special mention | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,373	27,886
Special mention | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	13,765	5,696
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	75,207	53,997
Substandard | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	31,963	7,572
Substandard | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	43,244	46,425
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Doubtful | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Doubtful | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 0	$ 0