Investment Securities - Schedule of Scheduled Maturities of Securities Available-for-Sale and Held-to-Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Available-for-Sale, Amortized Cost
Due in one year or less	$ 20,002
Due from one to five years	1,002
Due from after five to ten years	10,927
Due after ten years	67,717
Amortized Cost	99,648	$ 146,126
Available-for-Sale, Fair Value
Due in one year or less	20,002
Due from one to five years	1,006
Due from after five to ten years	10,957
Due after ten years	67,948
Total	99,913	147,414
Held-to-Maturity, Amortized Cost
Due from one to five years	1,329
Due from after five to ten years	10,773
Due after ten years	8,247
Amortized Cost	20,349	22,520
Held-to-Maturity, Fair Value
Due from one to five years	1,372
Due from after five to ten years	11,174
Due after ten years	8,598
Total	$ 21,144	$ 23,578