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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 557,891 | $ 692,674
Gross Unrealized Gains | 19,307 | 920
Gross Unrealized Losses | 0 | (30,300)
Fair Value | 577,198 | 663,294
Equity securities | 2,406 | 1,718
Total investment securities, at fair value | 595,876 | 665,012
Agency-guaranteed residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 273,252 | 311,267
Gross Unrealized Gains | 5,069 | 0
Gross Unrealized Losses | 0 | (5,893)
Fair Value | 278,321 | 305,374
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 284,639 | 381,407
Gross Unrealized Gains | 14,238 | 920
Gross Unrealized Losses | 0 | (24,407)
Fair Value | 298,877 | $ 357,920
Interest-only GNMA securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Interest-only GNMA securities | $ 16,272 |

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