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Investment Securities - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2022 USD ($) assetBackedSecurity contract security | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) assetBackedSecurity contract security | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) assetBackedSecurity contract security | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) security
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |  |  |
Proceed from sales of foreign subsidiaries |  | $ 3,800 |  |  | $ 0 | $ 3,765 |
Loss on sale of foreign subsidiaries |  | $ 2,800 | $ 0 | $ 2,840 | 0 | 2,840 |
Unrealized gain on investment securities |  |  |  | 1,700 |  | 2,700 |
Proceeds from sales of investment securities available for sale |  |  | $ 399,000 | $ 53,700 | $ 554,965 | 407,587 |
Number of available-for-sale investment securities, unrealized loss position, less than twelve month category | security | 140 |  | 140 |  | 140 |  |
Number of available-for-sale investment securities, unrealized loss position, twelve month or more category | contract | 7 |  | 7 |  | 7 |  |
Number of asset-backed securities with deterioration in future estimated cash flows | assetBackedSecurity | 4 |  | 4 |  | 4 |  |
Number of available-for-sale investment securities, unrealized loss position | security | 147 |  | 147 |  | 147 |  | 117
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Transfer of investment securities available for sale to held to maturity | $ 500,200 |  |  |  | $ 500,174 | $ 0 |
Unrealized losses recorded in AOCI upon transfer to held to maturity | 50,000 |  |  |  |  |  |
Asset Pledged as Collateral |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Debt securities | $ 19,300 |  | $ 19,300 |  | $ 19,300 |  | $ 11,300

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- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References No definition available. + Details
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