Allowance For Loan Losses (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Impaired [Line Items]
Past due threshold in days	30 days	30 days
Interest income	$ 0.2	$ 0.2
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