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Employee Benefit Plans (Components of Net Periodic Pension Plan Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Pension [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Service Cost $ 278 $ 305
Defined Benefit Plan, Interest Cost 1,650 1,740
Expected return on assets (3,002) (2,796)
Defined Benefit Plan, Amortization of Transition Obligations (Assets) 0 0
Amortization of recognized loss 1,057 848
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 12 12
Net pension credit included in employee benefits $ (5) $ 109
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 3.60% 4.10%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 4.10% 4.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 7.00% 7.00%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase 3.00% 3.00%
SERP [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Service Cost $ 113 $ 100
Defined Benefit Plan, Interest Cost 293 279
Expected return on assets 0 0
Defined Benefit Plan, Amortization of Transition Obligations (Assets) 0 0
Amortization of recognized loss 146 73
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (3) 20
Net pension credit included in employee benefits $ 549 $ 472
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.00% 4.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 0.00% 0.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 0.00% 0.00%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase 3.00% 3.00%