Other Long-term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Amount
Long-term debt	$ 8,749	$ 9,314
Borrowings from FHLB [Member]
Amount
2015		563
2016	586	585
2017	609	607
2018	633	631
2019	658	659
2020	684
Thereafter		$ 6,269
Thereafter	$ 5,579
2015, Weighted Average Contractual Rate		3.82%
2016, Weighted Average Contractual Rate	3.83%	3.83%
2017, Weighted Average Contractual Rate	3.83%	3.83%
2018, Weighted Average Contractual Rate	3.84%	3.83%
2019, Weighted Average Contractual Rate	3.84%	3.84%
2020, Weighted Average Contractual Rate	3.84%
Thereafter, Weighted Average Contractual Rate		3.81%
Thereafter, Weighted Average Contractual Rate	3.81%