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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,206,202 | $ 472,300
Gross Unrealized Gains | 798 | 2,639
Gross Unrealized Losses | (49,056) | (3,568)
Available-for-sale securities, debt securities | 1,157,944 |
Investment securities, at fair value | 1,161,000 | 471,371
Fair value | 1,161,000 | 471,371
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 381,545 | 44,959
Gross Unrealized Gains | 798 | 1,130
Gross Unrealized Losses | (21,335) | 0
Available-for-sale securities, debt securities | 361,008 |
Fair value |  | 46,089
Agency-guaranteed residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 490,425 | 186,221
Gross Unrealized Gains | 0 | 36
Gross Unrealized Losses | (13,862) | (2,799)
Available-for-sale securities, debt securities | 476,563 |
Fair value |  | 183,458
Agency-guaranteed commercial real estate mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 334,232 | 238,809
Gross Unrealized Gains | 0 | 432
Gross Unrealized Losses | (13,859) | (769)
Available-for-sale securities, debt securities | 320,373 |
Fair value |  | 238,472
Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 2,311
Gross Unrealized Gains |  | 1,041
Gross Unrealized Losses |  | 0
Investment securities, at fair value | $ 3,056 |
Fair value |  | $ 3,352

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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