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Employee Benefit Plans (Schedule of Reconciliation of Balances in AOCI - SERP) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net gain (loss) arising during period $ 1,601 $ (557) $ (4,321)
SERP [Member]      
Accumulated other comprehensive loss at beginning of fiscal year 533 625  
Net gain (loss) arising during period (85) (145)  
Prior service cost  
Amortization of unrecognized actuarial loss (34) (35)  
Amortization of prior service cost and transition obligation  
Tax benefit (expense) related to changes during the year, net 43 88  
Accumulated other comprehensive gain (loss) at end fiscal year $ 457 $ 533 $ 625