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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 680,637 | $ 692,674
Gross Unrealized Gains | 10,597 | 920
Gross Unrealized Losses | (1,405) | (30,300)
Fair Value | 689,829 | 663,294
Equity securities, at fair value |  | 1,718
Investment securities, at fair value | 708,359 | 665,012
Agency-guaranteed residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 299,370 | 311,267
Gross Unrealized Gains | 2,023 | 0
Gross Unrealized Losses | (2) | (5,893)
Fair Value | 301,391 | 305,374
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 381,267 | 381,407
Gross Unrealized Gains | 8,574 | 920
Gross Unrealized Losses | (1,403) | (24,407)
Fair Value | 388,438 | $ 357,920
Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities, at fair value | 1,373 |
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election |  |
Debt Securities, Available-for-sale [Line Items] |  |
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities | $ 17,157 |

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