Securities Available-for-Sale - Schedule of amortized cost and fair values of available-for-sale securities by contractual maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2022		Dec. 31, 2021
Due after one year through five years, Amortized Cost	$ 500
Due after five years through ten years, Amortized Cost	9,378
Due after ten years, Amortized Cost	67,736
Total U.S. Government-sponsored enterprises obligations, municipal bonds and corporate subordinated debt	77,614
Mortgage-backed securities, Amortized Cost	120,401		$ 90,577
Due after one year through five years, Fair Value	497
Due after five years through ten years, Fair Value	8,387
Due after ten years, Fair Value	60,812
Total U.S. Government-sponsored enterprises obligations, municipal bonds and corporate subordinated debt	69,696
Mortgage-backed securities, Fair Value	106,100		91,365
U.S. Government agency small business administration pools guaranteed by SBA [Member]
Mortgage-backed securities, Amortized Cost	9,475	[1]	5,059
Mortgage-backed securities, Fair Value	8,359	[1]	5,045
Collateralized mortgage obligations issued by the FHLMC, FNMA and GNMA [Member]
Mortgage-backed securities, Amortized Cost	6,922	[1]	3,400
Mortgage-backed securities, Fair Value	6,222	[1]	3,332
Residential mortgage backed securities [Member]
Mortgage-backed securities, Amortized Cost	26,390	[1]	23,784
Mortgage-backed securities, Fair Value	$ 21,823	[1]	$ 23,332

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