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Employee Benefit Plans (Schedule of Expected Future Benefits Payable) (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
2018 $ 2,679
2019 2,823
2020 3,045
2021 3,300
2022 3,693
2023-2027 23,682
Supplemental Executive Retirement Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2018 314
2019 313
2020 311
2021 367
2022 711
2023-2027 $ 3,813