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, 2019	Dec. 31, 2018
Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 15,726	$ 13,924
Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	13,959	18,026
Total TDR Modification
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	29,685	31,950
Commercial real estate | Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	4,509	4,524
Commercial real estate | Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	6,716	9,290
Commercial real estate | Total TDR Modification
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	11,225	13,814
Commercial | Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	5,589	3,696
Commercial | Non-Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	7,243	8,736
Commercial | Total TDR Modification
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	12,832	12,432
Residential | Accrual Status
Financing Receivable, Modifications [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	5,628	5,704
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	$ 5,628	$ 5,704