Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive income (loss), net of tax	$ (284)	$ (1,601)
Unrealized losses on securities available for sale, net
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss) beginning balance	(221)	(166)
Other comprehensive income (loss), net of tax	(70)	(55)
Accumulated other comprehensive income (loss) ending balance	(291)	(221)
Unrealized gains (losses) on pension benefits
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss) beginning balance	(7,630)	(6,084)
Other comprehensive income (loss), net of tax	(214)	(1,546)
Accumulated other comprehensive income (loss) ending balance	(7,844)	(7,630)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss) beginning balance	(7,851)	(6,250)
Accumulated other comprehensive income (loss) ending balance	$ (8,135)	$ (7,851)