Securities - Schedule of Components of Investment Securities Gains (Losses), Net (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Available-for-sale debt securities:
Gains realized on sales	$ 139,000	$ 0
Losses realized on sales	0	(2,000)
Impairment of AFS security		(4,800,000)
Equity securities with readily determinable fair values:
Fair value adjustments, net	(23,000)	88,000
Equity securities without readily determinable fair values:
Fair value adjustments, net	(450,000)	(610,000)
Sales	9,705,000
Total investment securities gains (losses), net	$ 9,371,000	$ (5,324,000)