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Employee Benefit Plans (Schedule of Reconciliation of Balances in AOCI - SERP) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Net gain (loss) arising during period $ (4,321) $ (5,171) $ 8,765
SERP [Member]      
Accumulated other comprehensive loss at beginning of fiscal year 976 949  
Net gain (loss) arising during period $ (497) $ 265  
Prior service cost  
Amortization of unrecognized actuarial loss $ (79) $ (221)  
Amortization of prior service cost and transition obligation  
Tax benefit (expense) related to changes during the year, net $ 225 $ (17)  
Accumulated other comprehensive gain (loss) at end of fiscal year $ 625 $ 976 $ 949