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Employee Benefit Plans (Schedule of SERP's Pension Cost) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Service cost - benefits earned during the year $ 3,795 $ 3,003  
Interest cost on projected benefit obligations 3,178 3,037  
Supplemental Executive Retirement Plan [Member]      
Service cost - benefits earned during the year 140 136 $ 144
Interest cost on projected benefit obligations 348 377 335
Net amortization and deferral 654 431 551
Net periodic pension cost $ 1,142 $ 944 $ 1,030