Securities - Summary of Amortized Cost and Fair Value of Debt Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Available-for-sale
Due in one year or less, Amortized Cost	$ 5,285
Due after one through five years, Amortized Cost	11,542
Due after five through ten years, Amortized Cost	18,308
Due after ten years, Amortized Cost	72,316
Amortized Cost, Available-for-sale	107,451	$ 111,874
Due in one year or less, Fair Value	5,283
Due after one through five years, Fair Value	11,649
Due after five through ten years, Fair Value	18,465
Due after ten years, Fair Value	72,866
Total debt securities available-for-sale, Fair Value	108,263	112,146
Held-to-maturity
Due after one through five years, Amortized Cost	3,000
Due after ten years, Amortized Cost	8,242
Amortized Cost, Held to maturity	11,242	13,869
Due after one through five years, Fair Value	3,008
Due after ten years, Fair Value	8,534
Total debt securities held-to-maturity, Fair Value	$ 11,542	$ 13,950