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Employee Benefit Plans (Schedule of Amounts in Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Pension [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), after Tax $ 14,335 $ 12,641
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Prior Service Cost (Credit), after Tax 13 20
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax, Total 14,348 12,661
SERP [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Gains (Losses), after Tax 729 306
Defined Benefit Plan, Accumulated Other Comprehensive Income Net Prior Service Cost (Credit), after Tax (8) 4
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax, Total $ 721 $ 310