Contingent Liabilities And Commitments (Summary Of Commitments And Contingent Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Loss Contingencies [Line Items]
Commitments and contingent liabilities	$ 221,317	$ 210,140
Commitments To Extend Credit [Member]
Loss Contingencies [Line Items]
Commitments and contingent liabilities	217,581	206,346
Standby Letters Of Credit [Member]
Loss Contingencies [Line Items]
Commitments and contingent liabilities	$ 3,736	$ 3,794