Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 2,677	$ (4,387)	$ 1,425
Net change in unrealized gains (losses) on securities available-for-sale:
Unrealized gain (losses)	(89)	(85)	309
Expense (benefit) due to enactment of federal tax reform		44
Income tax effect	19	(14)	(105)
Unrealized gains on securities, net	(70)	(55)	204
Pension benefit liability adjustment:
Net gain (loss) during the period	1,368	(2,006)	456
Expense (benefit) due to the enactment of federal tax reform		1,192
Reclassification of stranded income tax effects from accumulated other comprehensive income	(1,281)
Income tax effect	(301)	(732)	(155)
Pension liability adjustment, net of tax	(214)	(1,546)	301
Total other comprehensive income (loss), net of tax	(284)	(1,601)	505
Total comprehensive income (loss)	$ 2,393	$ (5,988)	$ 1,930