Allowance for Loan and Lease Loss and Credit Quality (Schedule Of Troubled Debt Restructuring By Accrual versus Non-Accrual Status) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 45,813	$ 40,667
Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	18,898	3,345
Total TDR Modification
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	64,711	44,012
Commercial real estate | Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	22,807	30,563
Commercial real estate | Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	7,244	0
Commercial real estate | Total TDR Modification
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	30,051	30,563
Commercial | Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	16,439	3,054
Commercial | Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	11,654	3,345
Commercial | Total TDR Modification
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	28,093	6,399
Residential | Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	6,567	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	$ 6,567	$ 7,050