Nature of Operations - Summary of Earnings Per Share, Basic and Diluted (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 473	$ 1,868
Weighted average basic common shares outstanding	8,103,248	8,020,456
Add: dilutive potential common shares	66,650	82,087
Weighted average diluted common shares outstanding	8,169,898	8,102,543
Basic earnings per share	$ 0.06	$ 0.23
Diluted earnings per share	$ 0.06	$ 0.23