Allowance for Loan and Lease Loss and Credit Quality (Schedule Of Troubled Debt Restructuring By Accrual versus Non-Accrual Status) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accrual Status
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investments	$ 32,157	$ 40,667
Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investments	22,066	3,345
TotalTDRModification [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investments	54,223	44,012
Commercial Real Estate | Accrual Status
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investments	17,694	30,563
Commercial Real Estate | Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investments	5,088	0
Commercial Real Estate | TotalTDRModification [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investments	22,782	30,563
Commercial | Accrual Status
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investments	7,787	3,054
Commercial | Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investments	16,978	3,345
Commercial | TotalTDRModification [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investments	24,765	6,399
Residential | Accrual Status
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investments	6,676	7,050
Residential | Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investments	0	0
Residential | TotalTDRModification [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable modifications recorded investments	$ 6,676	$ 7,050