Allowance for Credit Losses (Schedule Of Troubled Debt Restructuring) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 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	$ 20,500,000	$ 18,600,000
Financing Receivable, Modifications, Number of Contracts | contracts	84	62
Entity Loan Modification Program [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 20,870,000	$ 18,576,000
Entity Loan Modification Program [Member] | Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	20,541,000	18,576,000
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	$ 329,000	$ 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	$ 5,374,000	$ 3,968,000
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	5,045,000	3,968,000
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	$ 329,000	$ 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	$ 3,600,000	$ 4,105,000
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	3,600,000	4,105,000
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	$ 0	$ 0
Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	70	54
Residential | Entity Loan Modification Program [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 11,832,000	$ 10,460,000
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	11,832,000	10,460,000
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, net
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts | contracts	4	3
Consumer & other, net | Entity Loan Modification Program [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	$ 64,000	$ 43,000
Consumer & other, net | Entity Loan Modification Program [Member] | Accrual Status
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total troubled debt restructurings, net of deferred fees and costs	64,000	43,000
Consumer & other, net | 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