Allowance for Loan and Lease Loss and Credit Quality (Schedule Of Troubled Debt Restructuring By Accrual versus Non-Accrual Status) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 52,861	$ 40,667
Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	257	3,345
Total TDR Modification
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	53,118	44,012
Commercial real estate | Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	30,410	30,563
Commercial real estate | Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	0	0
Commercial real estate | Total TDR Modification
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	30,410	30,563
Commercial | Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	15,545	3,054
Commercial | Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	257	3,345
Commercial | Total TDR Modification
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	15,802	6,399
Residential | Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	6,906	7,050
Residential | Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	0	0
Residential | Total TDR Modification
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 6,906	$ 7,050