Postretirement Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Postretirement Health And Life Coverage [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 13	$ 13	$ 17
Interest Cost	32	38	34
Amortization of prior service cost		(1)	(1)
Net periodic postretirement benefit cost	45	50	50
Director's Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	33	33	32
Interest Cost	45	51	44
Amortization of prior service cost	22	22	22
Net periodic postretirement benefit cost	$ 100	$ 106	$ 98