Allowance For Loan Losses (Schedule Of Credit Quality Indicators) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 3,519,367	$ 3,587,608
Commercial Industrial Loans And Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,666,919	1,741,256
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	288,803	286,314
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,378,116	1,454,942
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,576,725	1,653,677
Pass | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	254,449	250,856
Pass | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,322,276	1,402,821
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total	12,316	33,582
Special mention | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	2,293	27,886
Special mention | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	10,023	5,696
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total	77,878	53,997
Substandard | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total	32,061	7,572
Substandard | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total	45,817	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