Contingent Liabilities And Commitments (Summary Of Commitments And Contingent Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Commitments and contingent liabilities	$ 259,243	$ 250,655
Commitments To Extend Credit [Member]
Loss Contingencies [Line Items]
Commitments and contingent liabilities	255,790	247,540
Standby Letters Of Credit [Member]
Loss Contingencies [Line Items]
Commitments and contingent liabilities	$ 3,453	$ 3,115