Securities Available-for-Sale - Schedule of amortized cost and fair values of available-for-sale securities by contractual maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2022		Dec. 31, 2021
Due after five years through ten years, Amortized Cost	$ 11,600
Due after ten years, Amortized Cost	55,442
Total U.S. Government-sponsored enterprises obligations, municipal bonds and corporate subordinated debt	67,042
Mortgage-backed securities, Amortized Cost	104,641		$ 90,577
Due after five years through ten years, Fair Value	10,976
Due after ten years, Fair Value	52,675
Total U.S. Government-sponsored enterprises obligations, municipal bonds and corporate subordinated debt	63,651
Mortgage-backed securities, Fair Value	98,490		91,365
U.S. Government agency small business pools guaranteed by SBA [Member]
Mortgage-backed securities, Amortized Cost	7,593	[1]	5,059
Mortgage-backed securities, Fair Value	7,272	[1]	5,045
Collateralized mortgage obligations issued by the FHLMC, FNMA and GNMA [Member]
Mortgage-backed securities, Amortized Cost	4,227	[1]	3,400
Mortgage-backed securities, Fair Value	3,947	[1]	3,332
Residential mortgage-backed securities
Mortgage-backed securities, Amortized Cost	25,779		23,784
Mortgage-backed securities, Fair Value	$ 23,620		$ 23,332

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