Employee Benefit Plans (Changes in Benefit Obligation, Fair Value of Assets and Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in plan assets:
Beginning balance	$ 6,771
Ending balance	7,348	$ 6,771
Amounts recognized in Accumulated Other Comprehensive Loss:
Total	3,321	3,228	$ 3,483	$ 3,483
Pension benefits
Change in benefit obligation:
Beginning balance	11,965	13,695
Interest cost	438	447	509
Plan participants’ contributions	0	0
Actuarial loss (gain)	151	(948)
Benefit payments	(427)	(148)
Settlements	0	(1,081)
Ending balance	12,127	11,965	13,695
Accumulated benefit obligation at December 31	12,127	11,965
Change in plan assets:
Beginning balance	7,124	8,259
Actual return on plan assets	405	(91)
Employer contributions	480	185
Plan participants’ contributions	0	0
Benefit payments	(427)	(148)
Settlements	0	(1,081)
Ending balance	7,582	7,124	8,259
Funded status at December 31	(4,545)	(4,841)
Amounts recognized in Consolidated Balance Sheets:
Accrued benefit liability	(4,545)	(4,841)
Net amount recognized	(4,545)	(4,841)
Amounts recognized in Accumulated Other Comprehensive Loss:
Unrecognized prior service cost	0	0
Unrecognized net loss (gain)	3,368	3,275
Total	$ 3,368	$ 3,275
Discount Rate	3.80%	3.90%
Other Postretirement Benefit Plans, Defined Benefit [Member]
Change in benefit obligation:
Beginning balance	$ 126	$ 152
Interest cost	4	4	6
Plan participants’ contributions	49	65
Actuarial loss (gain)	(7)	(10)
Benefit payments	(69)	(85)
Settlements	0	0
Ending balance	103	126	152
Accumulated benefit obligation at December 31	0	0
Change in plan assets:
Beginning balance	0	0
Actual return on plan assets	0	0
Employer contributions	20	20
Plan participants’ contributions	49	65
Benefit payments	(69)	(85)
Settlements	0	0
Ending balance	0	0	$ 0
Funded status at December 31	(103)	(126)
Amounts recognized in Consolidated Balance Sheets:
Accrued benefit liability	(103)	(126)
Net amount recognized	(103)	(126)
Amounts recognized in Accumulated Other Comprehensive Loss:
Unrecognized prior service cost	(1)	(2)
Unrecognized net loss (gain)	(48)	(47)
Total	$ (49)	$ (49)
Discount Rate	3.80%	3.90%
Mutual funds - equity
Change in plan assets:
Beginning balance	$ 4,908
Ending balance	5,241	$ 4,908
Mutual funds - taxable income
Change in plan assets:
Beginning balance	1,863
Ending balance	2,107	1,863
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring Basis
Change in plan assets:
Beginning balance	6,771
Ending balance	7,348	6,771
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring Basis | Mutual funds - equity
Change in plan assets:
Beginning balance	4,908
Ending balance	5,241	4,908
Quoted Prices in Active Markets for Identical Assets (Level 1) | Recurring Basis | Mutual funds - taxable income
Change in plan assets:
Beginning balance	1,863
Ending balance	2,107	1,863
Significant Other Observable Inputs (Level 2) | Recurring Basis
Change in plan assets:
Beginning balance	0
Ending balance	0	0
Significant Other Observable Inputs (Level 2) | Recurring Basis | Mutual funds - equity
Change in plan assets:
Beginning balance	0
Ending balance	0	0
Significant Other Observable Inputs (Level 2) | Recurring Basis | Mutual funds - taxable income
Change in plan assets:
Beginning balance	0
Ending balance	$ 0	$ 0