Securities - Schedule of Components of Investment Securities (Losses) Gains, Net (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Available-for-sale debt securities:
Gains realized on sales	$ 154,000		$ 154,000	$ 0
Losses realized on sales			(2,000)	0
Impairment of AFS security			(4,925,000)
Equity securities with readily determinable fair values:
Fair value adjustments, net	(223,000)	$ (1,441,000)	(197,000)	(8,570,000)
Equity securities without readily determinable fair values:
Fair value adjustments, net	340,000	96,000	817,000	1,261,000
Sales				66,162,000
Total investment securities (losses) gains, net	$ 271,000	$ (1,345,000)	$ (4,153,000)	$ 58,853,000