Investment Securities - Summary of Amortized Cost and Fair Value by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, 1 year or less	$ 7,846
Amortized Cost, Due after one year through five years	13,106
Amortized Cost, Due after five years through ten years	19,421
Amortized Cost, Due after ten years	27,112
Amortized Cost, Mortgage-backed securities and Collateralized Mortgage Obligations	71,276
Amortized Cost, Other securities	1,681
Amortized Cost	140,442	$ 120,372
Fair Value, 1 year or less	7,846
Fair Value, Due after one year through five years	12,883
Fair Value, Due after five years through ten years	18,641
Fair Value, Due after ten years	24,947
Fair Value, Mortgage-backed securities and Collateralized Mortgage Obligations	67,960
Fair Value, Other securities	1,672
Fair Value	133,949	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	21,616
Held To Maturity Other securities Amortized Cost	0
Held-to-Maturity, Amortized Cost	36,616	36,735
Held to Maturity Securities Fair Value, 1 year or less	2,956
Held to Maturity Securities Fair Value, Due after one year through five years	2,890
Held to Maturity Securities Fair Value, Due after five years through ten years	7,698
Held to Maturity Securities Fair Value, Due after ten years	0
Mortgage-backed securities and Collateralized mortgage obligations	20,725
Held To Maturity Other securities Fair Value	0
Held-to-maturity, Fair Value	$ 34,269	$ 34,236