Allowance for Loan and Lease Loss and Credit Quality (Schedule Of Troubled Debt Restructuring By Accrual versus Non-Accrual Status) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 46,322	$ 44,012
Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	43,029	40,667
Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	3,293	3,345
Commercial real estate
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	29,934	30,563
Commercial real estate | Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	29,934	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
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	9,127	6,399
Commercial | Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	5,834	3,054
Commercial | Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	3,293	3,345
Residential
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	7,261	7,050
Residential | Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	7,261	7,050
Residential | Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 0	$ 0