Fair Value Measurements (Schedule Of OREO Measured And Reported At Fair Value) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Other Real Estate [Roll Forward]
Beginning balance	$ 3,585	$ 4,588	$ 4,588
Disposed	(313)	(776)
Ending balance	3,912	4,405	$ 3,585
OREO remeasured at initial recognition:
Other Real Estate [Roll Forward]
Carrying value of foreclosed assets prior to remeasurement	1,218	1,226
Charge-offs recognized in the allowance for loan losses	(353)	(442)
Fair value	865	784
OREO remeasured subsequent to initial recognition:
Other Real Estate [Roll Forward]
Carrying value of foreclosed assets prior to remeasurement	1,362	1,464
Fair value	1,137	1,273
Write-downs included in other non-interest expense	$ (225)	$ (191)