Allowance for Credit Losses (Schedule Of Troubled Debt Restructuring) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($) contracts	Dec. 31, 2019 USD ($) contracts
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 15,800	$ 18,600
Financing Receivable, Modifications, Number of Contracts | contracts	93	62
Entity Loan Modification Program [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 27,719	$ 18,576
Entity Loan Modification Program [Member] | Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	15,819	18,576
Entity Loan Modification Program [Member] | Non-Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 11,900	$ 0
Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	8	3
Commercial real estate | Entity Loan Modification Program [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 5,302	$ 3,968
Commercial real estate | Entity Loan Modification Program [Member] | Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	1,356	3,968
Commercial real estate | Entity Loan Modification Program [Member] | Non-Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 3,946	$ 0
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	2	2
Commercial | Entity Loan Modification Program [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 9,212	$ 4,105
Commercial | Entity Loan Modification Program [Member] | Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	1,258	4,105
Commercial | Entity Loan Modification Program [Member] | Non-Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 7,954	$ 0
Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	78	54
Residential | Entity Loan Modification Program [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 13,100	$ 10,460
Residential | Entity Loan Modification Program [Member] | Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	13,100	10,460
Residential | Entity Loan Modification Program [Member] | Non-Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 0	$ 0
Consumer & Other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	5	3
Consumer & Other | Entity Loan Modification Program [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 105	$ 43
Consumer & Other | Entity Loan Modification Program [Member] | Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	105	43
Consumer & Other | Entity Loan Modification Program [Member] | Non-Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 0	$ 0