Investment Securities - Summary of Amortized Cost and Fair Value by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, 1 year or less	$ 133
Amortized Cost, Due after one year through five years	6,728
Amortized Cost, Due after five years through ten years	11,958
Amortized Cost, Due after ten years	26,447
Mortgage-backed securities and Collateralized mortgage obligations	44,102
Amortized Cost	89,368	$ 101,453
Fair Value, 1 year or less	134
Fair Value, Due after one year through five years	6,497
Fair Value, Due after five years through ten years	11,000
Fair Value, Due after ten years	21,617
Fair Value, Mortgage-backed securities, residential	39,450
Fair Value	78,698	103,783
Held to Maturity Securities Amortized Cost, 1 year or less	3,000
Held to Maturity Securities Amortized Cost, Due after one year through five years	11,993
Mortgage-backed securities and Collateralized mortgage obligations	17,578
Held-to-Maturity, Amortized Cost	32,571	0
Held to Maturity Securities Fair Value, 1 year or less	2,945
Held to Maturity Securities Fair Value, Due after one year through five years	11,165
Mortgage-backed securities and Collateralized mortgage obligations	16,805
Held-to-maturity, Fair Value	$ 30,915	$ 0