Investment Securities - Summary of Amortized Cost and Fair Value by Contractual Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, 1 year or less	$ 314
Amortized Cost, Due after one year through five years	6,480
Amortized Cost, Due after five years through ten years	12,701
Amortized Cost, Due after ten years	25,552
Amortized Cost, Mortgage-backed securities and Collateralized Mortgage Obligations	41,873
Amortized Cost	86,920	$ 101,453
Fair Value, 1 year or less	314
Fair Value, Due after one year through five years	6,340
Fair Value, Due after five years through ten years	11,949
Fair Value, Due after ten years	22,408
Fair Value, Mortgage-backed securities and Collateralized Mortgage Obligations	37,802
Fair Value	78,813	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	11,993
Mortgage-backed securities and Collateralized mortgage obligations	16,829
Held-to-Maturity, Amortized Cost	31,822	0
Held to Maturity Securities Fair Value, Due after one year through five years	2,888
Held to Maturity Securities Fair Value, Due after five years through ten years	11,111
Mortgage-backed securities and Collateralized mortgage obligations	16,081
Held-to-maturity, Fair Value	$ 30,080	$ 0