Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 1,493	$ 1,841	$ (6,648)	$ 5,056
Other comprehensive income:
Unrealized holding gain on available-for-sale securities arising during the period	63	296	1,463	2,109
Deferred income tax expense on net unrealized gain on available-for-sale securities	(13)	(62)	(307)	(443)
Reclassification of net (gains) losses on sales and calls of available-for-sale securities recognized in net income		(1)	(29)	1
Income tax expense on net realized gain on available-for-sale securities			6
Total other comprehensive income	50	233	1,133	1,667
Comprehensive income (loss)	$ 1,543	$ 2,074	$ (5,515)	$ 6,723