Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 449	$ (19)
Other comprehensive income (loss):
Unrealized holding gains (losses) gains arising during the period	2,315	(1,022)
Reclassification adjustment for gains realized in net income		(67)
Other comprehensive income (loss), before tax effect	2,315	(1,089)
Tax effect of other comprehensive income (loss) items	625	(295)
Other comprehensive income (loss), net of tax	1,690	(794)
Comprehensive income (loss)	$ 2,139	$ (813)