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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 698,260 | $ 472,300
Gross Unrealized Gains | 347 | 2,639
Gross Unrealized Losses | (31,575) | (3,568)
Available-for-sale securities, debt securities | 667,032 | 471,371
Investment securities, at fair value | 668,851 | 471,371
Investment securities, at fair value |  | 471,371
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 381,475 | 44,959
Gross Unrealized Gains | 347 | 1,130
Gross Unrealized Losses | (20,208) | 0
Available-for-sale securities, debt securities | 361,614 | 46,089
Agency-guaranteed residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 316,785 | 186,221
Gross Unrealized Gains | 0 | 36
Gross Unrealized Losses | (11,367) | (2,799)
Available-for-sale securities, debt securities | 305,418 | 183,458
Agency-guaranteed commercial real estate mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 238,809
Gross Unrealized Gains |  | 432
Gross Unrealized Losses |  | (769)
Available-for-sale securities, debt securities |  | 238,472
Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities, at fair value | $ 1,819 |
Amortized Cost |  | 2,311
Gross Unrealized Gains |  | 1,041
Gross Unrealized Losses |  | 0
Investment securities, at fair value |  | $ 3,352

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (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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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (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 (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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