Investment Securities - Summary of Amortized Cost and Estimated Market Value of Investment Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost, due in one year or less	$ 2,039
Amortized Cost, due after one year through five years	5,820
Amortized Cost, due after five years through ten years	8,380
Amortized Cost, due after ten years	45,950
Amortized Cost	62,189	$ 60,573
Fair Value, due in one year or less	1,996
Fair Value, due after one year through five years	5,608
Fair Value, due after five years through ten years	7,370
Fair Value, due after ten years	40,856
Fair Value	$ 55,830	$ 54,282