Contingent Liabilities And Commitments (Summary Of Commitments And Contingent Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Loss Contingencies [Line Items]
Commitments and contingent liabilities	$ 233,665	$ 221,317
Commitments To Extend Credit [Member]
Loss Contingencies [Line Items]
Commitments and contingent liabilities	230,790	217,581
Standby Letters Of Credit [Member]
Loss Contingencies [Line Items]
Commitments and contingent liabilities	$ 2,875	$ 3,736