Investment Securities - Summary of Maturities Available for Sale Investment Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Amortized Cost Available for sale securities:
One to five years	$ 22,114
Five to ten years	24,838
Beyond ten years	5,427
Securities not due at a single maturity date	22,382
Total investment securities	74,761	$ 54,183
Fair Value Available for sale securities:
One to five years	22,212
Five to ten years	25,072
Beyond ten years	5,218
Securities not due at a single maturity date	22,390
Total investment securities	74,892	$ 55,093
Amortized Cost Held to Maturity
One to five years	7,601
Five to ten years	5,614
Securities not due at a single maturity date	15,171
Total investment securities	28,386
Fair Value Held to Maturity
One to five years	7,558
Five to ten years	5,552
Securities not due at a single maturity date	15,106
Total investment securities	$ 28,216