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, 2021		Dec. 31, 2020
Due after five years through ten years, Amortized Cost	$ 10,132
Due after ten years, Amortized Cost	48,202
Total U.S. Government-sponsored enterprises obligations, municipal bonds and corporate subordinated debt	58,334
Mortgage-backed securities, Amortized Cost	90,577		$ 53,439
Due after five years through ten years, Fair Value	10,054
Due after ten years, Fair Value	49,602
Total U.S. Government-sponsored enterprises obligations, municipal bonds and corporate subordinated debt	59,656
Mortgage-backed securities, Fair Value	91,365		55,470
U.S. Government agency small business pools guaranteed by SBA [Member]
Mortgage-backed securities, Amortized Cost	5,059		2,399
Mortgage-backed securities, Fair Value	5,045		2,470
Residential mortgage-backed securities
Mortgage-backed securities, Amortized Cost	23,784	[1]	5,100
Mortgage-backed securities, Fair Value	23,332	[1]	5,136
Collateralized mortgage obligations issued by the FHLMC, FNMA and GNMA [Member]
Mortgage-backed securities, Amortized Cost	3,400	[1]	938
Mortgage-backed securities, Fair Value	$ 3,332	[1]	$ 949

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