Investment Securities - Summary of Maturities Available for Sale Investment Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost Available for sale securities:
Less that one year	$ 18,372
One to five years	4,976
Five to ten years	0
Beyond ten years	1,448
Securities not due at a single maturity date	7,433
Total investment securities	32,229	$ 45,798
Fair Value Available for sale securities:
Less that one year	18,100
One to five years	4,846
Five to ten years	0
Beyond ten years	1,328
Securities not due at a single maturity date	6,804
Total investment securities	31,078	44,560
Amortized Cost Held to Maturity
Less that one year	13,673
One to five years	14,480
Five to ten years	19,593
Beyond ten years	20,094
Securities not due at a single maturity date	28,000
Total investment securities	95,840	100,841
Fair Value Held to Maturity
Less that one year	13,640
One to five years	14,044
Five to ten years	16,885
Beyond ten years	16,036
Securities not due at a single maturity date	24,108
Total investment securities	$ 84,713	$ 90,030