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, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Due in one year or less	$ 1,064
Due after one through 5 years	7,312
Due after 5 through 10 years	13,352
Due after 10 years	2,291
Total debt and other securities, Fair Value	24,019
Total	104,641	$ 114,492
Due in one year or less	1,080
Due after one through 5 years	8,229
Due after 5 through 10 years	16,657
Due after 10 years	3,114
Total debt and other securities, Amortized Cost	29,080
Total	120,426
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Total debt and other securities, Fair Value	76,815
Total debt and other securities, Amortized Cost	87,519
Asset-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Total debt and other securities, Fair Value	3,807
Total	3,807	$ 4,517
Total debt and other securities, Amortized Cost	$ 3,827