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Securities - Schedule of Components of Investment Securities (Losses) Gains, Net (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Available-for-sale debt securities:
Gains realized on sales	$ 1,060	$ 311	$ 5,080	$ 5,715
Losses realized on sales	(2)		(2)	(171)
Equity securities with readily determinable fair values:
Fair value adjustments, net	(4,427)	84	(9,607)	84
Equity securities without readily determinable fair values:
Fair value adjustments, net	(141)	(870)	8,138	1,996
Total investment securities (losses) gains, net	$ (3,510)	$ (475)	$ 3,609	$ 7,624

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

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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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Amount of realized loss 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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