Deposits - Summary of Term Certificates by Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Amount
2016		$ 43,987
2017	$ 55,582	20,610
2018	15,257	8,295
2019	8,703	5,617
2020	5,856	4,882
2021	4,492
Total certificate accounts	$ 89,890	$ 83,391
Weighted Average Rate
2016		0.74%
2017	0.83%	1.01%
2018	1.01%	1.13%
2019	1.21%	1.36%
2020	1.62%	1.68%
2021	1.52%
Total	0.98%	0.94%