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Employee Benefit Plans (Schedule of Reconciliation of Balances in AOCI) (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)
Pension Plan [Member]      
Accumulated other comprehensive loss at beginning of fiscal year (3,692) (3,466)  
Net gain (loss) arising during period 1,686 (412)  
Amortization of unrecognized actuarial loss 244 238  
Tax (expense) benefit of changes during the year, net (711) (52)  
Accumulated other comprehensive gain (loss) at end fiscal year (2,473) (3,692) $ (3,466)
Reclassification from AOCI to Retained Earnings due to statutory tax changes (436)  
Accumulated other comprehensive gain (loss) at end of fiscal year $ (2,909) $ (3,692)