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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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