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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, 2025		Dec. 31, 2024
Due after one year through five years, Amortized Cost	$ 6,588
Due after five years through ten years, Amortized Cost	5,264
Due after ten years, Amortized Cost	30,699
Total U.S. Government-sponsored enterprises obligations ("GSE"), municipal bonds, corporate debt and corporate subordinated debt, Amortized Cost	42,551
Mortgage-backed securities, Amortized Cost	149,415		$ 129,814
Due after one year through five years, Fair Value	6,484
Due after five years through ten years, Fair Value	4,854
Due after ten years, Fair Value	27,024
Total U.S. Government-sponsored enterprises obligations ("GSE"), municipal bonds, corporate debt and corporate subordinated debt, Fair Value	38,362
Mortgage-backed securities, Fair Value	142,520		120,217
U.S. Government agency small business pools guaranteed by SBA [Member]
Mortgage-backed securities, Amortized Cost	11,981	[1]	14,011
Mortgage-backed securities, Fair Value	11,222	[1]	13,125
Collateralized mortgage obligations issued by the FHLMC, FNMA, and GNMA [Member]
Mortgage-backed securities, Amortized Cost	34,584	[1]	19,924
Mortgage-backed securities, Fair Value	34,951	[1]	19,362
Residential mortgage-backed GSE securities [Member]
Mortgage-backed securities, Amortized Cost	60,299	[1]	52,452
Mortgage-backed securities, Fair Value	$ 57,985	[1]	$ 48,462
[1] Actual maturities for these debt securities are dependent upon the interest rate environment and prepayments on the underlying loans.

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