Securities Available-for-Sale - Schedule of amortized cost and fair values of securities available-for-sale by contractual maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2024		Dec. 31, 2023
Due after one year through five years, Amortized Cost	$ 500
Due after five years through ten years, Amortized Cost	10,917
Due after ten years, Amortized Cost	55,946
Total U.S. Government-sponsored enterprises obligations ("GSE"), municipal bonds, corporate debt and corporate subordinated debt, Amortized Cost	67,363
Mortgage-backed securities, Amortized Cost	139,660		$ 129,988
Due after one year through five years, Fair Value	487
Due after five years through ten years, Fair Value	9,938
Due after ten years, Fair Value	53,680
Total U.S. Government-sponsored enterprises obligations ("GSE"), municipal bonds, corporate debt and corporate subordinated debt, Fair Value	64,105
Mortgage-backed securities, Fair Value	133,004		121,854
U.S. Government agency small business administration pools guaranteed by SBA [Member]
Mortgage-backed securities, Amortized Cost	14,537	[1]	16,410
Mortgage-backed securities, Fair Value	13,862	[1]	15,583
Collateralized mortgage obligations issued by the FHLMC, FNMA and GNMA [Member]
Mortgage-backed securities, Amortized Cost	15,594	[1]	2,958
Mortgage-backed securities, Fair Value	15,263	[1]	2,474
Residential mortgage backed GSE securities [Member]
Mortgage-backed securities, Amortized Cost	42,166	[1]	41,186
Mortgage-backed securities, Fair Value	$ 39,774	[1]	$ 38,221

[1] Actual maturities for these debt securities are dependent upon the interest rate environment and prepayments on the underlying loans.