Securities - Summary of Amortized Cost and Fair Value of Debt Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Available-for-sale
Due in one year or less, Amortized Cost	$ 602
Due after one through five years, Amortized Cost	29,583
Due after five through ten years, Amortized Cost	30,066
Due after ten years, Amortized Cost	72,141
Amortized Cost, Available-for-sale	132,392	$ 189,072
Due in one year or less, Fair Value	605
Due after one through five years, Fair Value	29,589
Due after five through ten years, Fair Value	29,884
Due after ten years, Fair Value	71,630
Total debt securities available-for-sale, Fair Value	131,708	190,438
Held-to-maturity
Due after one through five years, Amortized cost	9,876
Due after five through ten years, Amortized Cost	3,887
Due after ten years, Amortized Cost	161,045
Amortized Cost, Held-to-maturity	174,808	9,045
Due after one through five years, Fair Value	9,837
Due after five through ten years, Fair Value	3,911
Due after ten years, Fair Value	160,780
Total debt securities held-to-maturity, Fair Value	$ 174,528	$ 9,225