Other Long-term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Amount
Long-term debt	$ 56,258	$ 56,917
Borrowings from FHLB [Member]
Amount
2015	50,685	659
2016	712	50,685
2017	739	712
2018	769	739
2019	799	769
Thereafter	$ 2,554	$ 3,353
2015, Weighted Average Contractual Rate	2.32%	3.84%
2016, Weighted Average Contractual Rate	3.85%	2.32%
2017, Weighted Average Contractual Rate	3.86%	3.85%
2018, Weighted Average Contractual Rate	3.86%	3.86%
2019, Weighted Average Contractual Rate	3.86%	3.86%
Thereafter, Weighted Average Contractual Rate	3.74%	3.77%