Employee Benefits And Deferred Compensation Plans (Schedule Of Net Periodic Benefit Costs, Employee Pension Plan) (Details) - Pension Plans [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Service cost
Interest cost	221	205	206
Expected return on plan assets	(263)	(308)	(307)
Net amortization and deferral	85	71	22
Net periodic benefit cost	$ 43	$ (32)	$ (79)