Investment Securities - Summary of Amortized Cost and Fair Value by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, 1 year or less	$ 312
Amortized Cost, Due after one year through five years	7,695
Amortized Cost, Due after five years through ten years	14,105
Amortized Cost, Due after ten years	26,362
Amortized Cost, Mortgage-backed securities and Collateralized Mortgage Obligations	44,960
Amortized Cost	93,434	$ 86,920
Fair Value, 1 year or less	308
Fair Value, Due after one year through five years	7,605
Fair Value, Due after five years through ten years	13,495
Fair Value, Due after ten years	23,819
Fair Value, Mortgage-backed securities and Collateralized Mortgage Obligations	41,577
Fair Value	86,804	78,813
Held to Maturity Securities Amortized Cost, 1 year or less	0
Held to Maturity Securities Amortized Cost, Due after one year through five years	8,000
Held to Maturity Securities Amortized Cost, Due after five years through ten years	7,000
Held to Maturity Securities Amortized Cost, Due after ten year	0
Mortgage-backed securities and Collateralized mortgage obligations	24,519
Held-to-Maturity, Amortized Cost	39,519	31,822
Held to Maturity Securities Fair Value, 1 year or less	0
Held to Maturity Securities Fair Value, Due after one year through five years	7,483
Held to Maturity Securities Fair Value, Due after five years through ten years	6,486
Held to Maturity Securities Fair Value, Due after ten years	0
Mortgage-backed securities and Collateralized mortgage obligations	23,882
Held-to-maturity, Fair Value	$ 37,851	$ 30,080