Investment Securities - Summary of Maturities Available for Sale Investment Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Amortized Cost Available for sale securities:
Less that one year	$ 0
One to five years	34,810
Five to ten years	2,141
Beyond ten years	2,512
Securities not due at a single maturity date	9,828
Total investment securities	49,291	$ 74,761
Fair Value Available for sale securities:
Less that one year	0
One to five years	33,645
Five to ten years	2,100
Beyond ten years	2,477
Securities not due at a single maturity date	9,137
Total investment securities	47,359	74,892
Amortized Cost Held to Maturity
Less that one year	2,521
One to five years	21,080
Five to ten years	32,139
Beyond ten years	21,606
Securities not due at a single maturity date	32,826
Total investment securities	110,172
Fair Value Held to Maturity
Less that one year	2,478
One to five years	20,377
Five to ten years	30,049
Beyond ten years	16,811
Securities not due at a single maturity date	27,989
Total investment securities	$ 97,704	$ 28,216