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Other Long-term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Amount
Long-term debt	$ 7,551	$ 8,161
Borrowings from FHLB [Member]
Amount
2015	631	607
2016	655	631
2017	681	656
2018	708	681
2019	735	708
Thereafter	$ 4,141	$ 4,878
2015, Weighted Average Contractual Rate	3.83%	3830.00%
2016, Weighted Average Contractual Rate	3.84%	3.83%
2017, Weighted Average Contractual Rate	3.84%	3.84%
2018, Weighted Average Contractual Rate	3.85%	3.84%
2019, Weighted Average Contractual Rate	3.85%	3.85%
Thereafter, Weighted Average Contractual Rate	3.79%	3.80%

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