Benefit Plans (Net Periodic Pension Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 59	$ 46
Interest cost	254	243
Expected return on plan assets	(252)	(272)
Recognized net actuarial loss	128	109
Net periodic cost	$ 189	$ 126
Obligation	4.09%	4.05%
Expense	4.05%	3.75%
Expected long-term rate of return on assets	5.50%	5.50%
Estimated 2017 Net Periodic Benefit Cost [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 66
Interest cost	261
Expected return on plan assets	(257)
Amortization of net loss	133
Recognized net actuarial loss	107
Net periodic cost	$ 310