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Foreclosed Assets - Summary of Expenses Related to Foreclosed Real Estate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Banking and Thrift [Abstract]
Net (gain) loss on sale	$ (208)	$ (134)	$ 3
Operating expenses, net of rental income	366	223	169
Total	$ 158	$ 89	$ 172