Investment Securities - Summary of Amortized Cost and Fair Value by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, 1 year or less	$ 300
Amortized Cost, Due after one year through five years	7,684
Amortized Cost, Due after five years through ten years	14,908
Amortized Cost, Due after ten years	25,485
Amortized Cost, Mortgage-backed securities and Collateralized Mortgage Obligations	42,946
Amortized Cost	91,323	$ 86,920
Fair Value, 1 year or less	296
Fair Value, Due after one year through five years	7,506
Fair Value, Due after five years through ten years	14,027
Fair Value, Due after ten years	22,793
Fair Value, Mortgage-backed securities and Collateralized Mortgage Obligations	38,998
Fair Value	83,620	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	6,000
Held to Maturity Securities Amortized Cost, Due after five years through ten years	9,000
Held to Maturity Securities Amortized Cost, Due after ten year	0
Mortgage-backed securities and Collateralized mortgage obligations	23,806
Held-to-Maturity, Amortized Cost	38,806	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	5,696
Held to Maturity Securities Fair Value, Due after five years through ten years	7,522
Held to Maturity Securities Fair Value, Due after ten years	0
Mortgage-backed securities and Collateralized mortgage obligations	22,840
Held-to-maturity, Fair Value	$ 36,058	$ 30,080