Securities - Summary of Amortized Cost and Fair Value of Debt Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Available-for-sale
Due in one year or less, Amortized Cost	$ 3,679
Due after one through five years, Amortized Cost	10,258
Due after five through ten years, Amortized Cost	16,003
Due after ten years, Amortized Cost	71,833
Amortized Cost, Available-for-sale	101,773	$ 111,874
Due in one year or less, Fair Value	3,722
Due after one through five years, Fair Value	10,394
Due after five through ten years, Fair Value	16,293
Due after ten years, Fair Value	72,793
Total debt securities available-for-sale, Fair Value	103,202	112,146
Held-to-maturity
Due in one year or less, Amortized Cost	3,425
Due after ten years, Amortized Cost	7,446
Amortized Cost, Held to maturity	10,871	13,869
Due in one year or less, Fair Value	3,425
Due after ten years, Fair Value	7,695
Total debt securities held-to-maturity, Fair Value	$ 11,120	$ 13,950