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Investment Securities - Additional Information (Detail) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 03, 2021 USD ($) | Jun. 30, 2021 USD ($) security | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) security | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) security
Schedule of Investments [Line Items] |  |  |  |  |  |
Unrealized gain (loss) on investment securities |  | $ 1,700 | $ 1,200 | $ 2,700 | $ (200) |
Proceed from sales of foreign subsidiaries |  |  |  | 3,765 | 0 |
Loss on sale of foreign subsidiaries |  | 2,840 | 0 | 2,840 | 0 |
Proceeds from sales of investment securities available for sale |  | 53,700 | 109,200 | 407,587 | 109,207 |
Realized gain |  | $ 1,800 | $ 4,400 | $ 25,400 | $ 8,300 |
Number of available-for-sale investment securities, unrealized loss position, less than twelve month category | security |  | 38 |  | 38 |  |
Number of available-for-sale investment securities, unrealized loss position, twelve month or more category | security |  | 0 |  | 0 |  |
Number of available-for-sale investment securities, unrealized loss position | security |  |  |  |  |  | 16
Pledged investment securities fair value |  | $ 16,000 |  | $ 16,000 |  | $ 18,800
CB Green Ventures Pte Ltd. and CUBI India Ventures Pte Ltd |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Proceed from sales of foreign subsidiaries | $ 3,800 |  |  |  |  |
Loss on sale of foreign subsidiaries | $ 2,800 |  |  |  |  |

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