Foreclosed Assets - Summary of Expenses Related to Foreclosed Real Estate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Real Estate [Abstract]
Net gain on sale	$ (377)	$ (310)	$ (208)
Operating expenses, net of rental income	316	283	366
Total	$ (61)	$ (27)	$ 158