Investment Securities - Summary of Amortized Cost and Fair Value by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, 1 year or less	$ 95
Amortized Cost, Due after one year through five years	5,554
Amortized Cost, Due after five years through ten years	11,983
Amortized Cost, Due after ten years	29,872
Amortized Cost, Mortgage-backed securities and Collateralized Mortgage Obligations	44,438
Amortized Cost	91,942	$ 101,453
Fair Value, 1 year or less	95
Fair Value, Due after one year through five years	5,535
Fair Value, Due after five years through ten years	11,532
Fair Value, Due after ten years	26,757
Fair Value, Mortgage-backed securities, residential	41,837
Fair Value	85,756	103,783
Held to Maturity Securities Amortized Cost, Due after one year through five years	3,000
Held to Maturity Securities Amortized Cost, Due after five years through ten years	6,993
Mortgage-backed securities and Collateralized Mortgage Obligations	18,823
Held-to-Maturity, Amortized Cost	28,816
Held to Maturity Securities Fair Value, Due after one year through five years	2,965
Held to Maturity Securities Fair Value, Due after five years through ten years	6,787
Mortgage-backed securities and Collateralized Mortgage Obligations	18,538
Held-to-maturity, Fair Value	$ 28,290	$ 0