Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	[1]	$ (6,955)	$ (5,269)
Other comprehensive loss before reclassifications	[1]	(371)	(789)
Amounts reclassified from accumulated other comprehensive loss		314	247
Period change	[1]	(57)	(542)
Reclassification of certain income tax effects from other comprehensive loss	[1]		(1,144)
Balance	[1]	(7,012)	(6,955)
Defined Benefit Pension Plan
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	[1]	(534)	(316)
Other comprehensive loss before reclassifications	[1]	(100)	(447)
Amounts reclassified from accumulated other comprehensive loss	[1]	295	229
Period change	[1]	195	(218)
Balance	[1]	(339)	(534)
Unrealized Losses on available for sale securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	[1]	(6,421)	(4,953)
Other comprehensive loss before reclassifications	[1]	(271)	(342)
Amounts reclassified from accumulated other comprehensive loss	[1]	19	18
Period change	[1]	(252)	(324)
Reclassification of certain income tax effects from other comprehensive loss	[1]		(1,144)
Balance	[1]	$ (6,673)	$ (6,421)

[1] All amounts are net of tax. Related income tax expense or benefit is calculated using an income tax rate of 21.0 % in Fiscal 2018 and 34.0% in Fiscal 2017.