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Investment Securities - Narrative (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) Security | Dec. 31, 2017 USD ($) | Dec. 31, 2016 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 | 26 |  |  |
Number of available-for-sale investment securities in the twelve month or more category (security) | Security | 0 |  |  |
Available-for-sale Securities |  | $ 471,371 |  |
Unrealized gains (losses) on available-for-sale securities | $ (20,283) | 2,520 | $ 2,505 |
Deferred tax liabilities, equity investments |  | 0 |  |
Equity investment securities, at fair value | 1,718 |  |  |
Pledged investment securities fair value | 23,000 | 16,900 |  |
Equity securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Impairment loss |  | (12,900) |  |
Available-for-sale Securities |  | 3,352 |  |
Unrealized gains (losses) on available-for-sale securities |  | $ 1,000 |  |
Accounting Standards Update 2016-01 |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Cumulative effect adjustment | 0 |  |  |
Accounting Standards Update 2016-01 | Accumulated Other Comprehensive Income (Loss) |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Cumulative effect adjustment |  |  |  | $ 1,000
Other Non-interest Income | Equity securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Unrealized loss | $ 1,600 |  |  |

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