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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Details) - Supplemental Executive Retirement Plan - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Service cost $ 328 $ 330 $ 656 $ 660
Interest cost 113 96 226 192
Net periodic benefit cost $ 441 $ 426 $ 882 $ 852