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Securities - Schedule of Other Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Other Securities [Line Items] |  |
Other securities | $ 342,543 | $ 327,098
FRB and FHLB stock [Member] |  |
Schedule of Other Securities [Line Items] |  |
Other securities | 36,222 | 36,222
Equity Securities With Readily Determinable Fair Values [Member] |  |
Schedule of Other Securities [Line Items] |  |
Other securities | 40,639 | 64,149
Equity Securities Without Readily Determinable Fair Values [Member] |  |
Schedule of Other Securities [Line Items] |  |
Other securities | $ 265,682 | $ 226,727

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