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Investment Securities - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) Security | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) Security | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Number of available-for-sale investment securities in the less than twelve month category (security) | Security | 64 |  | 64 |  |  |
Number of available-for-sale investment securities in the twelve month or more category (security) | Security | 16 |  | 16 |  |  |
Impairment loss on investment securities | $ 0 | $ (2,882) | $ 0 | $ (4,585) |  |
Investment securities, at fair value | 1,161,000 |  | 1,161,000 |  | $ 471,371 |
Unrealized gains (losses) on equity securities | (9,020) | 10,188 | (34,253) | 9,503 |  |
Gain (Loss) on Investments |  |  | (296) | 0 |  |
Pledged investment securities fair value | 685,000 |  | 685,000 |  | 16,900 |
Equity securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Impairment loss on investment securities |  | $ (2,900) |  | $ (4,600) |  |
Investment securities, at fair value |  |  |  |  | 3,352 |
Unrealized gains (losses) on equity securities |  |  |  |  | 1,000 |
Accounting Standards Update 2016-01 |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | $ 0 |
Accumulated Other Comprehensive Loss | Accounting Standards Update 2016-01 |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  |  | $ 1,000
Other Non-interest Income | Equity securities |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Gain (Loss) on Investments | $ 300 |  | $ (300) |  |  |

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- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for less than one year or normal operating cycle, if longer, for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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