Investment Securities - Summary of Amortized Cost and Fair Value by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, 1 year or less	$ 2,072
Amortized Cost, Due after one year through five years	13,693
Amortized Cost, Due after five years through ten years	20,162
Amortized Cost, Due after ten years	27,132
Amortized Cost, Mortgage-backed securities and Collateralized Mortgage Obligations	88,528
Amortized Cost, Other securities	524
Amortized Cost	152,111	$ 120,372
Fair Value, 1 year or less	2,068
Fair Value, Due after one year through five years	13,621
Fair Value, Due after five years through ten years	19,749
Fair Value, Due after ten years	25,534
Fair Value, Mortgage-backed securities and Collateralized Mortgage Obligations	87,828
Fair Value, Other securities	515
Fair Value	149,315	115,490
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	3,000
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	19,626
Held To Maturity Other securities Amortized Cost	0
Held-to-Maturity, Amortized Cost	34,626	36,735
Held to Maturity Securities Fair Value, 1 year or less	2,980
Held to Maturity Securities Fair Value, Due after one year through five years	2,959
Held to Maturity Securities Fair Value, Due after five years through ten years	7,863
Held to Maturity Securities Fair Value, Due after ten years	0
Mortgage-backed securities and Collateralized mortgage obligations	19,021
Held To Maturity Other securities Fair Value	0
Held-to-maturity, Fair Value	$ 32,823	$ 34,236