Allowance for Credit Losses (Schedule Of Troubled Debt Restructuring) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) contracts	Dec. 31, 2020 USD ($) contracts
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 9,800	$ 15,000
Financing Receivable, Modifications, Number of Contracts | contracts	53	83
Entity Loan Modification Program
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 9,919	$ 15,280
Entity Loan Modification Program | Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	9,849	14,991
Entity Loan Modification Program | Non-Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 70	$ 289
Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	5	7
Commercial real estate | Entity Loan Modification Program
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 1,131	$ 1,634
Commercial real estate | Entity Loan Modification Program | Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	1,061	1,345
Commercial real estate | Entity Loan Modification Program | Non-Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 70	$ 289
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts		1
Commercial | Entity Loan Modification Program
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs		$ 1,231
Commercial | Entity Loan Modification Program | Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs		1,231
Commercial | Entity Loan Modification Program | Non-Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs		$ 0
Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	45	75
Residential | Entity Loan Modification Program
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 8,762	$ 12,415
Residential | Entity Loan Modification Program | Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	8,762	12,415
Residential | Entity Loan Modification Program | 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	3
Consumer & Other | Entity Loan Modification Program
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 26
Consumer & Other | Entity Loan Modification Program | Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	26
Consumer & Other | Entity Loan Modification Program | Non-Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 0