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Securities - Schedule of Components of Investment Securities Gains, Net (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Available-for-sale debt securities:
Gains realized on sales		$ 1,300	$ 0	$ 4,020
Equity securities with readily determinable fair values:
Fair value adjustments, net	$ (5,407)	8,738	(7,129)	(5,180)
Equity securities without readily determinable fair values:
Fair value adjustments, net	(35)	5,417	1,165	8,279
Sales	66,162		66,162
Total investment securities gains, net	$ 60,720	$ 15,455	$ 60,198	$ 7,119

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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