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Employee Benefit Plans (Schedule of Reconciliation of Balances in AOCI - SERP) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net gain (loss) arising during period	$ (41)	$ 1,601	$ (557)
SERP [Member]
Accumulated other comprehensive loss at beginning of fiscal year	457	533
Net gain (loss) arising during period	102	(85)
Prior service cost
Amortization of unrecognized actuarial loss	(13)	(34)
Amortization of prior service cost and transition obligation
Tax benefit (expense) related to changes during the year, net	78	43
Accumulated other comprehensive gain (loss) at end fiscal year	$ 624	$ 457	$ 533

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The before tax amount of unrecognized actuarial loss.

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