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Other Long-term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Amount
Long-term debt	$ 8,161	$ 8,749
Borrowings from FHLB [Member]
Amount
2015		586
2016	607	609
2017	631	633
2018	656	658
2019	681	684
2020	708
Thereafter		$ 5,579
Thereafter	$ 4,878
2015, Weighted Average Contractual Rate		3.83%
2016, Weighted Average Contractual Rate	3.83%	3.83%
2017, Weighted Average Contractual Rate	3.83%	3.84%
2018, Weighted Average Contractual Rate	3.84%	3.84%
2019, Weighted Average Contractual Rate	3.84%	3.84%
2020, Weighted Average Contractual Rate	3.85%
Thereafter, Weighted Average Contractual Rate		3.81%
Thereafter, Weighted Average Contractual Rate	3.80%

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