Securities - Schedule of Components of Investment Securities (Losses) Gains, Net (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Available-for-sale debt securities:
Gains realized on sales			$ 139,000	$ 0
Losses realized on sales			0	(2,000)
Impairment of AFS security		$ (125,000)		(4,925,000)
Equity securities with readily determinable fair values:
Fair value adjustments, net	$ (26,000)	(62,000)	(49,000)	26,000
Equity securities without readily determinable fair values:
Fair value adjustments, net	(2,565,000)	1,087,000	(3,015,000)	477,000
Sales	724,000		10,429,000
Total investment securities (losses) gains, net	$ (1,867,000)	$ 900,000	$ 7,504,000	$ (4,424,000)