Available for Sale Securities - Summary of Amortized Costs and Fair Values of Securities Available-for-sale, by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	$ 726
Due after one through 5 years	264
Due after 5 through 10 years	13,665
Total debt and other securities, Fair Value	14,655
Total	100,315	$ 109,559
Due in one year or less	730
Due after one through 5 years	260
Due after 5 through 10 years	15,845
Total debt and other securities, Amortized Cost	16,835
Total	107,383
Government-sponsored Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Total debt and other securities, Fair Value	82,948
Total debt and other securities, Amortized Cost	87,837
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Total debt and other securities, Fair Value	2,712
Total	2,712	$ 3,572
Total debt and other securities, Amortized Cost	$ 2,711