Allowance For Credit Losses (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Threshold Period for Discontinuance of Interest Accrual	90 days	90 days
Financing Receivable, Threshold Period Past Due	30 days		30 days
Interest income		$ 100
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend	$ 0
Financing Receivable, Nonaccrual, Interest Income	100	100
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	100	100	$ 700
Financing Receivables, Impaired, Troubled Debt Restructuring, Provision for Credit Losses	$ 100	$ 100
Residential real estate
Financing Receivable, Impaired [Line Items]
Threshold period past due for write-off of financing receivable	120 days	120 days
Commercial Industrial Loans And Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Threshold period past due for write-off of financing receivable	120 days	120 days
Consumer
Financing Receivable, Impaired [Line Items]
Threshold period past due for write-off of financing receivable	180 days	180 days