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Securities - Schedule of Components of Investment Securities (Losses) Gains, Net (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Available-for-sale debt securities:
Gains realized on sales		$ 1,060,000	$ 0	$ 5,080,000
Equity securities with readily determinable fair values:
Fair value adjustments, net	$ (1,441,000)	(4,427,000)	(8,570,000)	(9,607,000)
Equity securities without readily determinable fair values:
Fair value adjustments, net	96,000	(141,000)	1,261,000	8,138,000
Sales			66,162,000
Losses realized on sales		(2,000)	0	(2,300)
Total investment securities (losses) gains, net	$ (1,345,000)	$ (3,510,000)	$ 58,853,000	$ 3,609,000

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Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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-Publisher FASB
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